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Indirect Inguinal Hernia

Indirect inguinal hernia is characterized by intestinal protrusion of the peritoneum and its passage through the internal inguinal ring together with the spermatic cord. It comprises about half of all inguinal hernias and is much more frequent among males. Clinical presentation includes abdominal discomfort and a palpable retractable mass. The diagnosis rests on clinical grounds, while surgery is the main form of therapy.

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WIKIDATA, Public Domain

Presentation

The clinical presentation of patients invariably includes some form of abdominal discomfort, which is often accompanied by pain, especially during any form of physical activity. Pain when coughing is one of the hallmarks of this condition. A sense of pressure in the groin region, as well as swelling, may be reported [13]. The majority of patients will complain about a prominent bulge in the inguinal region, most often noticed when standing for a prolonged period of time. In the case of indirect inguinal hernia, testicular enlargement is frequent. The indirect inguinal hernia usually develops unilaterally, but a bilateral presentation may occur in some individuals.

Entire Body System

  • Inguinal Hernia

    […] with direct inguinal hernia. [ncbi.nlm.nih.gov]

  • Pain

    BACKGROUND: Chronic pain is common after herniorrhaphy, but the effect of surgical technique (mesh versus non-mesh repair) and the social consequences of the pain have not been established. [ncbi.nlm.nih.gov]

    There might be pain or discomfort in the groin. If the hernia pushed into your scrotum, pain and swelling around the testicle will be present. In newborns, the hernia might be visible when the child cries or coughs. [medicinenet.com]

  • Weakness

    These inguinal hernias are usually caused by weakness in the muscle of the abdominal wall. The weakness can be due to an acute event (heavy lifting) or slowly develop over time. Most commonly, this hernia is found in adult males. [medicinenet.com]

    Some of the potential causes for an inguinal hernia include: Pregnancy Straining during bowel movements Lifting heavy objects A weak abdominal wall Chronic coughing Increased abdominal pressure Congenital weakness What are the symptoms of an inguinal [nycherniasurgery.com]

    The term 'indirect' refers to the fact that the bowel and peritoneal protrusion don't herniate directly through a weakness in the abdominal musculature. [meddean.luc.edu]

    This is called a congenital weakness because it is usually present when you are born. [shouldice.com]

  • Surgical Procedure

    One cause of injury to this mechanism is by denervation and regional muscle paralysis occurring during a surgical procedure. Surgical denervation appears to have caused an indirect inguinal hernia in one of the authors. [ncbi.nlm.nih.gov]

    Gives you the details you need to understand all aspects of each procedure. Includes the surgical indications and relative contraindications to specific procedures, giving you the big picture principles for each procedure. [books.google.com]

    Uncomplicated inguinal hernias in patients of any age may be repaired as ambulatory surgical procedures using local, regional, or general anesthesia. ... [accesssurgery.mhmedical.com]

  • Fever

    Fever, nausea, and vomiting: These are also concerning symptoms that need to be treated urgently. Indirect Hernia Causes There are two inguinal canals — one on each side of the groin. [buoyhealth.com]

    You have nausea, fever, or vomiting along with hernia pain. [stanfordchildrens.org]

    Symptoms of a strangulated hernia include: Extreme tenderness and redness in the area of the bulge Sudden pain that worsens in a short period of time Fever Rapid heart rate Left untreated, nausea, vomiting, and severe infection can occur. [generalsurgery.ucsf.edu]

    Differential Diagnosis of Groin and Scrotal Masses Diagnosis Clinical presentation Ectopic testis Absence of a testis in the scrotum Epididymitis Severe pain surrounding the testis, tenderness, fever, chills Femoral adenitis/adenopathy Bilateral, firm [aafp.org]

    Symptoms of a strangulated hernia or intestinal obstruction include pain, nausea, vomiting, inability to flatulate or have a bowel movement, fever, chills, and/or abdominal swelling. [physio-pedia.com]

Respiratoric

  • Cough

    CLINICAL FEATURES Lump at an appropriate anatomical site Increases in size on coughing or straining. It reduces in size or disappears when relaxed or supine position. Examination may show it to have a cough impulse and to be reducible 6. Rt. [slideshare.net]

    Your doctor will look for a bulge/lump in the groin area and may ask you to stand, cough, or bend down during the examination to check for discomfort. [nycherniasurgery.com]

    Other risk factors include aging, frequent coughing such as from smoking, straining from constipation or heavy lifting, and family history. [study.com]

  • Chronic Cough

    The patients resumed normal duties between 5 and 14 days after repair and have been followed up for 1-5 years, with one (0.3%) patient, who was also being treated for chronic cough, who had recurrence 3 years after operation. [ncbi.nlm.nih.gov]

    Chronic cough and pregnancy are also risk factors. Hernia Treatments Surgical repair is indicated for most hernias that require treatment. All irreducible hernias need immediate evaluation because of the possibility of becoming strangulated. [medicinenet.com]

    Chronic cough, such as from smoking. Chronic constipation. Constipation causes straining during bowel movements. Pregnancy. Being pregnant can weaken the abdominal muscles and cause increased pressure inside your abdomen. [mayoclinic.org]

    Some of the potential causes for an inguinal hernia include: Pregnancy Straining during bowel movements Lifting heavy objects A weak abdominal wall Chronic coughing Increased abdominal pressure Congenital weakness What are the symptoms of an inguinal [nycherniasurgery.com]

  • Pneumonia

    이에 따르면 특발성, 간질성 폐렴은 상용 간질성 폐렴(Idiopathic Pulmonary Fibrosis / Usual Interstitial Pneumonia, IPF/UIP)  비특이적 간질성 폐렴(Nonspecific Interstitial Pneumonia, NSIP), 특발성 기질화 폐렴 (Cryptogenic Organizing Pneumonia, COP), 급성 간질성 폐렴(Acute Interstitial Pneumonia, AIP [m.blog.naver.com]

    […] pneumonitis Lymphocytic interstitial pneumonia Nonspecific interstitial pneumonia Usual interstitial pneumonia Desquamative interstitial pneumonia Diffuse alveolar hemorrhage [ekjm.org]

    More serious problems include heart attack, stroke, pneumonia, and blood clots in the legs. Getting out of bed after surgery and moving as soon as the doctor allows will help reduce the risk of complications such as pneumonia and blood clots. [generalsurgery.ucsf.edu]

  • Sneezing

    […] medial = direct References:[1][2][4][3] Clinical features Visible, palpable groin protrusion or bulge Inguinal pain (does not have to correlate with the size of the hernia) Increase of symptoms during physical activity (walking or standing, coughing, sneezing [amboss.com]

    In such a situation, the bulge appears or becomes larger when intra-abdominal pressure is increased, for example, when the baby strains at stools, coughs, sneezes or cries. inguinal hernia - Image Copyright: ellepigrafica / Shutterstock Types An inguinal [news-medical.net]

    Others might occur as a result of: Increased pressure within the abdomen A pre-existing weak spot in the abdominal wall Straining during bowel movements or urination Strenuous activity Pregnancy Chronic coughing or sneezing In many people, the abdominal [mayoclinic.org]

    Hernias that occur in older adult males are common and can happen from pressure, like straining during bowel movements, heavy lifting, coughing, sneezing or obesity. [urologyhealth.org]

Gastrointestinal

  • Constipation

    Chronic constipation. Constipation causes straining during bowel movements. Pregnancy. Being pregnant can weaken the abdominal muscles and cause increased pressure inside your abdomen. Premature birth and low birth weight. [mayoclinic.org]

    The easiest way to think about the causes of inguinal hernias is to think of: Increased intra-abdominal pressure Weakness of the abdominal muscles The causes are therefore as follows: Chronic cough Constipation Heavy lifting Advanced age Obesity How do [geekymedics.com]

    This includes eating a good diet to avoid constipation, caring for the wound, and not straining yourself too soon. [nhs.uk]

    Other risk factors include family history, premature birth, overweight or obesity, pregnancy, chronic cough and constipation. There are two types of inguinal hernia: indirect and direct. [jomi.com]

  • Vomiting

    Fever, nausea, and vomiting: These are also concerning symptoms that need to be treated urgently. Indirect Hernia Causes There are two inguinal canals — one on each side of the groin. [buoyhealth.com]

    If the contents of the hernia become trapped in the weak point in the abdominal wall, it can obstruct the bowel, leading to severe pain, nausea, vomiting, and the inability to have a bowel movement or pass gas. Strangulation. [mayoclinic.org]

    If you experience sudden pain, vomiting, or nausea, your intestine may have become trapped in a hernia and it is important to contact your doctor immediately. Inguinal hernia treatment There are different treatment methods for an inguinal hernia. [belmarrahealth.com]

    COMPLICATIONS Obstruction • Irreducible • abdominal pain, • distension and vomiting may occur • The hernia will be tense tender and irreducible Strangulation • become red and tender, • Irreducible • No impulse on cough. • If contains bowel signs of obstruction [slideshare.net]

    You have nausea, fever, or vomiting along with hernia pain. [stanfordchildrens.org]

  • Nausea

    Fever, nausea, and vomiting: These are also concerning symptoms that need to be treated urgently. Indirect Hernia Causes There are two inguinal canals — one on each side of the groin. [buoyhealth.com]

    If the contents of the hernia become trapped in the weak point in the abdominal wall, it can obstruct the bowel, leading to severe pain, nausea, vomiting, and the inability to have a bowel movement or pass gas. Strangulation. [mayoclinic.org]

    If you experience sudden pain, vomiting, or nausea, your intestine may have become trapped in a hernia and it is important to contact your doctor immediately. Inguinal hernia treatment There are different treatment methods for an inguinal hernia. [belmarrahealth.com]

    You have nausea, fever, or vomiting along with hernia pain. [stanfordchildrens.org]

    This will usually lead to severe pain, as well as nausea and vomiting. If the blood supply is cut off, the hernia is considered strangulated. A strangulated hernia is life-threatening and requires immediate surgery. [medicinenet.com]

  • Abdominal Pain

    Recurrent colicky abdominal pain was the leading symptom in the others. Reoperation confirmed the diagnosis of internal hernia in all but 1 patient. [ncbi.nlm.nih.gov]

    COMPLICATIONS Obstruction • Irreducible • abdominal pain, • distension and vomiting may occur • The hernia will be tense tender and irreducible Strangulation • become red and tender, • Irreducible • No impulse on cough. • If contains bowel signs of obstruction [slideshare.net]

    In many cases, it is asymptomatic, even though postprandial abdominal pain or, during exercise, nauseas, vomiting, and weight loss could be found. [websurg.com]

    Overview Snapshot A 54-year-old male comes to the emergency room with right-sided groin pain, swelling, colicky abdominal pain and abdominal distension, nausea and 2 episodes of vomiting. [medbullets.com]

    Significant abdominal or groin pain and bloating: If this occurs, pushing on the bulge may worsen the pain. The skin overlying the hernia may appear red. [buoyhealth.com]

  • Acute Abdomen

    Physical examination showed signs of an ileus in the absence of an acute abdomen. Laboratory investigations revealed no abnormalities (CRP 2.0 mg/L, white blood count 6.3 × 109/L). During admission, there was clinical deterioration on the third day. [ncbi.nlm.nih.gov]

    Computed tomography (CT) remains the best available imaging tool for evaluation of acute abdomen and abdominal hernias (6–8). [pubs.rsna.org]

Psychiatrical

  • Fear

    […] the other hand, surgery has a risk of inguinodynia (10-12%), and this is why males with minimal symptoms are advised to watchful waiting.[25][26] However, if they experience discomfort while doing physical activities or they routinely avoid them for fear [en.wikipedia.org]

Neurologic

  • Neuralgia

    […] hernia repair have demonstrated similar recurrence rates with the use of mesh and have identified that chronic groin pain (>10%) surpasses recurrence (<2%) and is an important measure of success.[1][2] Chronic groin pain is potentially disabling with neuralgia [en.wikipedia.org]

Urogenital

  • Testicular Pain

    Fever, weight loss, diaphoresis, cough Recent contact with infection Femoral aneurysm Pulsing mass Epididymitis Testicular pain Discharge Painful urination Fever, chills Hydrocele Non-tender swollen testicle May be seen in addition to an inguinal hernia [physio-pedia.com]

    Visceral pain can manifest as testicular and ejaculatory pain which may be associated with mesh ingrowth into spermatic cord structures.[citation needed] Prevention[edit] Nerves management[edit] Avoiding nerve entrapment and injury is critical. [en.wikipedia.org]

    Ischaemia produces testicular pain, tenderness and swelling. Testicular atrophy is observed in 1–5% of males. [surgwiki.com]

  • Swelling of the Scrotum

    Inguinal Hernia Hydroceles occur when fluid fills a sac in the scrotum of the penis (in the "inguinal canal"). About 10 in 100 male infants have a hydrocele at birth. Hydroceles can also develop with swelling or injury of the scrotum. [urologyhealth.org]

    It rarely enters the scrotum. Usually painless Reduces when person lies supine Round swelling near pubis in area of deep inguinal ring [8] Indirect Hernia [1] The contained sac protrudes through the deep inguinal ring. [physio-pedia.com]

    Changes in sensation may be experienced along the scrotum and inner thigh.[11] Urgent repair[edit] A hernia in which the small intestine has become incarcerated or strangulated constitutes a surgical emergency. [en.wikipedia.org]

  • Cryptorchidism

    Palpate the scrotum to determine if either a hydrocele or cryptorchidism (undescended testes) is present. [medical-dictionary.thefreedictionary.com]

    […] following potential conditions:[18] Femoral hernia Epididymitis Testicular torsion Lipomas Inguinal adenopathy (Lymph node Swelling) Groin abscess Saphenous vein dilation, called Saphena varix Vascular aneurysm or pseudoaneurysm Hydrocele Varicocele Cryptorchidism [en.wikipedia.org]

  • Scrotal Mass

    Communicating hydroceles frequently present with a history of a scrotal mass that changes in size; the scrotal size increases during crying, defecation and decreases after periods of inactivity, e.g. sleeping. [pedclerk.uchicago.edu]

    Differential Diagnosis of Groin and Scrotal Masses Diagnosis Clinical presentation Ectopic testis Absence of a testis in the scrotum Epididymitis Severe pain surrounding the testis, tenderness, fever, chills Femoral adenitis/adenopathy Bilateral, firm [aafp.org]

Workup

The diagnosis of indirect inguinal hernia is generally based on clinical grounds [9]. During a physical examination, the most important part of the diagnostic workup, a retractable bulge is observed and palpated. Palpation should be performed when the patient is both sitting and standing. To confirm the diagnosis, the patient is asked to cough, which will manifest in protrusion of the viscera that can be prevented by external mechanical pressure on the inguinal canal through the testes by the physician. Sometimes, the examination may be difficult to perform (obese patients, those unwilling to cooperate), while unskilled physicians may not differentiate the cause of swelling in the inguinal region. Imaging studies are rarely necessary to confirm the diagnosis, but they may be useful if patients complain of some other symptoms. Abdominal ultrasonography is sufficient in excluding other potential pathologies.

Treatment

Surgical repair is the only method used in managing indirect inguinal hernia. Insertion of a mesh or sutured repair is the most common method used, either by laparoscopy or open surgery [5]. Studies have established much lower rates of recurrence with the use of a mesh [14] [15] and is frequently favored over suture repair. There is much debate on the choice of either laparoscopic or open surgery in managing inguinal hernias [16]. Open surgery can be performed by general surgeons, local anesthesia is used and longer recovery time is observed [17]. On the other hand, laparoscopy is shown to result in significantly less postoperative pain and less time away from normal daily activities [5], which is why both of these procedures are used in general practice.

Prognosis

The overall prognosis of patients with an indirect inguinal hernia is good, as the majority of patients experience mild symptoms that are effectively treated by surgery. In some patients, an inguinal hernia may recur. Indirect forms recur less frequently than direct and factors for recurrent inguinal hernia were established to be female gender and smoking in certain studies [11]. Complications are rarely encountered and are established to occur in less than 1% of patients. However, incarceration or strangulation, the most common complications reported, may have a life-threatening risk for patients, as mortality rates in acute surgery reach up to 7% [12]. Despite the fact that overall mortality rates from surgery are less than 0.5% according to various studies [5], the diagnosis of an indirect inguinal hernia should be made during the physical examination without hesitation and appropriate surgical procedures, when indicated, should be performed as soon as possible.

Etiology

Although specific embryologic processes that are involved in the pathogenesis of indirect inguinal hernia have been identified, why this process persists and what are the pathophysiologic mechanisms leading to its development remain unknown. Moreover, persistent (or patent) processus vaginalis and the protrusion of the peritoneum through which indirect inguinal hernia passes was questioned as the sole factor for this abnormality. This brings into question the role of other factors in this condition [8].

Epidemiology

Inguinal hernia repair is considered to be one of the most common surgical procedures performed in medical practice worldwide, with more than 20 million hernia repairs being done every year [1]. Somewhat recent data indicate that more than 700,000 inguinal hernia repairs are being performed in the United States on an annual basis [2]. Certain studies estimate indirect inguinal hernia being slightly more common than direct [7]. Male gender is significantly more affected by this anatomical abnormality, as its occurrence is much more common in males. Additionally, and a significantly increased lifetime risk is established for males - the estimated lifetime risk is around 26%, compared to only 7% for women [9]. Despite these findings, an indirect inguinal hernia is the most common form of a hernia in the female population. In addition to male gender, increasing age is also established in some studies to be a risk factor [4]. On the other hand, the risk of development of an inguinal hernia is reduced among African-American individuals, for unknown reasons [4].

Pathophysiology

Indirect inguinal hernias seem to occur due to the incomplete obliteration of processus vaginalis during the testicular descent into the scrotum [3]. During organogenesis, the testes originate in the retroperitoneum and migrate into the deep inguinal ring around the 6th month of pregnancy [3]. Later on, testes slowly start to descend toward the scrotal sacs via the inguinal canal enclosed by a layer of parietal peritoneum, known as processus vaginalis. This process should obliterate shortly after birth, but for some reason, it remains fully preserved, which creates favorable conditions for contents of the peritoneum to protrude through this sac [10]. As a result, the viscera, under various circumstances, mainly due to mechanical pressure, are able to descend through this process into the scrotum and give the characteristic bulging appearance on clinical examination.

Prevention

Since the events that predispose patients to indirect inguinal hernia occur very early in life, prevention is not possible. Some steps in reducing the risk for complications, however, may be performed. If patients experience even mild symptoms, they should avoid activities which put pressure on the abdominal wall, such as heavy lifting and report to their physician as soon as they notice either swelling or a bulge in their groin or testes. An early diagnosis can facilitate treatment with minimal risk for complications.

Summary

An inguinal hernia is considered to be one of the most common surgically managed diseases worldwide, with estimated 20 million surgeries being performed every year [1]. It is considered to be one of the most frequent procedures in the United States, as more than 700,000 hernia repairs are being performed on an annual basis [2]. There are two main types of an inguinal hernia - direct, in which viscera protrude directly through the peritoneal wall and the posterior wall of the inguinal canal; indirect, on the other hand, is distinguished by protrusion through the deep inguinal ring and passage adjacent to the spermatic cord, eventually terminating in the testes. Additionally, the indirect inguinal hernia is recognized by its location in relation to the inferior epigastric artery, by passing laterally from this blood vessel, while a direct hernia passes medially. The pathogenesis of indirect inguinal hernia presumably includes both congenital and acquired factors. During embryonic development, the testes, once they are formed, descend into the scrotum covered by processus vaginalis, a protrusion of the parietal peritoneum created during organogenesis. As the testes descend, processus vaginalis should obliterate, but for some reason, this process does not occur in some individuals, which predisposes visceral protrusion through this processus [3]. This type of hernia is often seen in neonates at birth and infants, but adults are also commonly affected and a significant predilection toward male gender is established. In terms of epidemiology among ethnic groups, African-American individuals are shown to have a reduced risk for the development of hernias in general [4]. Clinical presentation of patients suffering from indirect inguinal hernia usually consists of abdominal pain and discomfort, but the presence of a bulge that retracts on the pressure in the inguinal region is seen in virtually all cases. In most cases, testicular involvement is prominent. In some cases, swelling and significant discomfort may be noted during the physical examination. The differentiation between the two forms of hernias is thought to be of significant importance [5], primarily because treatment principles may somewhat vary. Physical examination of the inguinal canal can provide means to a definite diagnosis and should be performed when the patient is both standing and sitting [6]. Once the diagnosis is made, surgical therapy is performed in all cases sooner or later. In the setting of acute symptoms and development of complications such as strangulation, surgery is performed immediately, while the debate regarding the timing of surgery in mild or asymptomatic patients is ongoing [7]. This condition can pose a risk for the patient, but an early diagnosis, proper therapy, and follow-up, poses little harm for individuals.

Patient Information

An indirect inguinal hernia is a form of a hernia occurring in the groin region which comprises a protrusion of the organs, mainly intestines, through the abdominal wall and their descent into the scrotum along with the spermatic cord. Normally, during formation of organs in the fetus, the testes slowly descend into their designated place (the scrotum) soon after birth. They descend enclosed in a pouch called processus vaginalis, a part of the sheath enclosing all abdominal organs, the peritoneum. When the testes reach the scrotum, processus vaginalis should degrade, as its function is no longer necessary, but for some reason, this structure persists and enables organs to reside in this pouch that extends to the testes. All types of inguinal hernia, including indirect, are much more common among males while increasing age is an established risk factor, but patients of any age, including neonates, can develop this type of hernia. Patients complain of abdominal discomfort and pain, especially when standing, because of mechanical pressure of abdominal organs. Usually, a bulge in the groin or enlarged testes can be observed during a physical examination. This bulge may be retracted by external pressure from the physician, which is a definite diagnostic sign of the hernia. The bulge, as well as pain, is often aggravated when coughing. This is the reason why patients will be often asked to cough during palpation of the groin and testes. The diagnosis is based on these findings and imaging studies are not necessary. For all patients, surgical repair is indicated. Surgery can be performed by laparoscopy, a procedure that necessitates general anesthesia, somewhat higher rates of recurrence, but lower postoperative pain and quicker return to normal daily activities. Open surgery, on the other hand, is performed under local anesthesia and has lower recurrence rates. Overall, the prognosis is generally good, as complications, such as incarceration (leading to bowel obstruction) and strangulation (obstruction of blood flow to the herniated tissue and is considered as a medical emergency) are very rare. However, they may pose a significant risk to the patient, which is why this condition is usually treated immediately after it is diagnosed.

References

  1. Rutkow IM. Demographic and socioeconomic aspects of hernia repair in the United States in 2003. Surg Clin North Am. 2003;83:1045–1051.
  2. van Wessem KJ, Simons MP, Plaisier PW, Lange JF. The etiology of indirect inguinal hernias: congenital and/or acquired? Hernia. 2003;7(2):76-79.
  3. Ruhl CE, Everhart JE. Risk factors for inguinal hernia among adults in the US population. Am J Epidemiol. 2007;165:1154–1161.
  4. Browse NL. Distinguishing direct and indirect inguinal hernias. BMJ. 1980;280(6226):1270.
  5. Jenkins JT, O’Dwyer PJ. Inguinal hernias. BMJ. 2008;336(7638):269-272.
  6. Kulacoglu H. Current options in inguinal hernia repair in adult patients. Hippokratia. 2011;15(3):223-231.
  7. Burcharth J, Andresen K, Pommergaard HC, Bisgaard T, Rosenberg J. Recurrence patterns of direct and indirect inguinal hernias in a nationwide population in Denmark. Surgery. 2014;155(1):173-177.
  8. Kahn AM, Hamlin JA, Thompson JE. The etiology of the adult indirect inguinal hernia: revisited. Am Surg. 1997;63(11):967-969.
  9. Bobrow RS. The hernia. J Am Board Fam Pract. 1999;12(1):95-96.
  10. Kelly KB, Ponsky TA. Pediatric abdominal wall defects. Surg Clin North Am. 2013;93(5):1255–1267.
  11. Burcharth J. The epidemiology and risk factors for recurrence after inguinal hernia surgery. Dan Med J. 2014;61(5):B4846.
  12. Bay-Nielsen M, Kehlet H, Strand L, Malmstrøm J, Andersen FH, Wara P, et al. Quality assessment of 26 304 herniorrhaphies in Denmark: a prospective nationwide study. Lancet. 2001;358:1124-1128.
  13. Matthews RD, Neumayer L. Inguinal hernia in the 21st century: an evidence-based review. Curr Probl Surg. 2008;45(4):261-312.
  14. Bisgaard T, Bay-Nielsen M, Christensen IJ, Kehlet H. Risk of recurrence 5 years or more after primary Lichtenstein mesh and sutured inguinal hernia repair. Br J Surg. 2007;94:1038-1040.
  15. Scott NW, McCormack K, Graham P, Go PM, Ross SJ, Grant AM. Open mesh versus non-mesh for repair of femoral and inguinal hernia. Cochrane Database Syst Rev. 2002;CD002197.
  16. Kingsnorth A. Inguinal hernia--laparoscopic or open repair? The case for open repair. Ann R Coll Surg Engl. 2005;87(1):59–60.
  17. Memon MA, Cooper NJ, Memon B, Memon MI, Abrams KR. Meta-analysis of randomised clinical trials comparing open and laparoscopic inguinal hernia repair. Br J Surg. 2003;90:1479-1482.
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