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Partial Monosomy 18q

Partial Deletion of 18q


  • In trisomy 13 (Patau’s syndrome) an extra chromosome number 13 is present in each cell. See Fig 4 Figure 4. The karyotype of a male with Trisomy 13. In trisomy 18 (Edwards’ syndrome) an extra chromosome number 18 is present in each cell.[softireland.com]
  • This case report presents with characteristic features along with rare feature of single nostril.[jisppd.com]
  • In addition, in over 30 percent of cases, congenital heart defects may be present.[rarediseases.org]
  • A small proportion of hematological neoplasms with 11q23 abnormalities has an initial presentation as MDS, some presenting as sMDS.[atlasgeneticsoncology.org]
  • Mild microcephaly may be present.[ojrd.biomedcentral.com]
Short Stature
  • Short stature is common, as are various hearing and vision problems. Behavioral problems can occur, sometimes causing patients to exhibit autistic-like behaviors.[en.wikibooks.org]
  • Short stature and poor growth are common features of individuals with 18q deletions. GH deficiency is common in this cohort of patients and probably plays a role in the short stature seen in many of the affected individuals.[academic.oup.com]
  • Characteristic clinical features include short stature, mental retardation, hypotonia, facial and distal skeletal abnormalities. The presence of the syndrome is usually evident at or soon after birth.[radiopaedia.org]
  • The might also have seizures, low muscle tone (hypotonia), speech and language delays, obesity, and short stature. Chromosome testing of both parents can provide more information on whether or not the deletion was inherited.[malacards.org]
  • The main clinical features are short stature, round face with short philtrum, palpebral ptosis and large ears with detached pinnae. Intellectual deficiency is mild to moderate.[ojrd.biomedcentral.com]
Multiple Congenital Anomalies
  • United Arab Emirates El Kalla et al. (1992) reported the case of an infant with multiple congenital anomalies, and tetralogy of Fallot. Karyotypic analysis revealed a karyotype of 45, X, t(Y;18)(q12;11.2).[cags.org.ae]
  • Isidor B, Winer N, Joubert M et al. (2008) Inherited 18q23 duplication in a fetus with multiple congenital anomalies. European Journal of Medical Genetics 51(3): 231–238.[els.net]
  • The third patient was born with multiple congenital anomalies, affecting the head, face, heart, legs and muscles. His karyotype showed extremely large p arms of chromosome 15, Figure 5, but we could not establish the cause of this peculiar aspect.[tmj.ro]
Coarctation of the Aorta
  • Septal defects, tetralogy of Fallot, dextrocardia, and coarctation of the aorta have all been reported in infants with 18p-. Neurologic [ edit ] Hypotonia is frequently seen in the 18p- population.[en.wikipedia.org]
  • View Article PubMed Google Scholar Baumer A, Belli S, Trueb RM, Schinzel A: An autosomal dominant form of hereditary hypotrichosis simplex maps to 18p11.32-p11.23 in an Italian family. Eur J Hum Genet. 2000, 8: 443-448. 10.1038/sj.ejhg.5200506.[ojrd.biomedcentral.com]
  • […] in all out of the known disorders out there he dosn't fit into any one mold he dosn't even know if there is annother person out there with a simalar problem also i can tell you his symptoms he is severly hearing impaired he has about 20% hearing left constipation[circleofmoms.com]
  • Constipation Constipation is common in individuals with 9p Deletions. Promoting activity, a nutritious and high fiber diet, and the aid of laxatives helps keep stools regular.[9pminus.org]
  • Gastrointestinal [ edit ] Chronic constipation is a frequent complaint in the 18p- population. Other abdominal abnormalities that have been reported include inguinal hernias ; malrotation of the gut ; and abnormalities of the spleen.[en.wikipedia.org]
Hearing Impairment
  • Fifteen patients (45%) had conductive hearing impairment (range: 30dB–70dB). Twelve of these 15 patients (80%) received hearing aids, which resulted in improved hearing but not in speech development.[journals.lww.com]
  • impaired he has about 20% hearing left constipation problems facial tics developemental delays accross th eboard speech problems skin problems ecthama( i can't spell it) :) flat feet wide flat nasal bridge thin upper lip also had hard time nursing as[circleofmoms.com]
  • CrossRef Google Scholar Volume 114 , Issue 12 December 2000 , pp. 963-966 (a1) South West Thames Regional Genetics Service, St George’s Hospital Medical School , London, UK The 18q-syndrome is associated with hearing impairment in 50-80 per cent of cases[cambridge.org]
  • The phenotype is highly variable, but is characterized by mental retardation, short stature, hypotonia, hearing impairment, and foot deformities. The syndrome is often accompanied by selective IgA deficiency and associated autoimmune disease.[catalog.coriell.org]
  • These may include unusually prominent ears and/or abnormally narrow (stenotic) or absent (atretic) external ear canals, with associated hearing impairment.[rarediseases.org]
Short Neck
  • Newborns have multiple defects – micrognathia, short neck, congenital heart defects and renal malformations. The children look weak and fragile. The incidence is 1 in 8000. Boys are more affected than girls.[wikilectures.eu]
  • neck (3%) Severe feeding problems (3%) Age of onset, natural history, life span [ edit ] Symptoms are apparent from birth in most cases Natural history: Most patients have IQs between 40 and 85, normal IQ (100 or above) has also been reported.[en.wikibooks.org]
  • neck 30 Flat feet Microcephaly (small head & brain) 23 Short limbs Ptosis (droopy eyelids) 23 Hypotonia (poor muscle tone) 23 * Of those individuals whose IQ was measured, the average was 59.[labmed.hallym.ac.kr]
  • Typical patients are small, with a short neck and a characteristic posture: they stand with widespread legs and leaning slightly forward. Mild microcephaly may be present.[ojrd.biomedcentral.com]
Carp-Like Mouth
  • Although there is significant phenotypic variation, some features are relatively constant and include 1 : decreased growth craniofacial dysmorphism midface hypoplasia frontal bossing "carp-like" mouth genital hypoplasia limb abnormalities clubfoot syndactyly[radiopaedia.org]
  • […] ears (8%) Foot deformities (51-74%) Club foot (21%) Abnormal implantation of the second toe (21%) Gap between first and second toe (3%) Endocrine problems IgA deficiency (30%) Growth hormone deficiency (68%) Facial dysmorphism Microcephaly (53-56%) "Carp-like[en.wikibooks.org]


  • Because this is a more expensive test, it is often not the first test ordered during a diagnostic workup. However, it is a much more precise test than a routine chromosome analysis.[chromosome18.org]


  • Recent research has uncovered potential treatment for short stature and dysmyelination caused by 18q-. Growth hormone treatment has been shown to potentially increase IQ in children with 18q-.[en.wikibooks.org]
  • The baby was kept under regular follow-up as there were no observable signs and symptoms for immediate treatment.[jisppd.com]
  • Treatment [ edit ] At present, treatment for 18p- is symptomatic, meaning that the focus is on treating the signs and symptoms of the conditions as they arise.[en.wikipedia.org]


  • This has important ramifications for phenotype mapping of this syndrome, as well as for proper prognosis.[uthscsa.influuent.utsystem.edu]
  • 書誌情報 簡易表示 永続的識別子 info:ndljp/pid/3161475 タイトル Loss of heterozygosity on chromosome 18q in cohesive type gastric cancer is associated with tumor progression and poor prognosis(胃癌における第18番染色体長腕対立遺伝子のヘテロ接合性欠失は癌進展及び不良な予後と関連がある) 著者 井上徳司 [著] 出版年月日 1998 請求記号 UT51[dl.ndl.go.jp]
  • MDS is a somewhat heterogeneous group of patients with regard to clinical presentation, laboratory findings and prognosis.[atlasgeneticsoncology.org]
  • prognosis ( Table 2 ).[nejm.org]
  • There is a poor prognosis for those with severe brain malformations, most often they die in the newborn. There is low recurrence risk rate to siblings for those cases that arise de novo.[jisppd.com]


  • Handbook of Genetic Counseling This page may need to be reviewed for quality. 18q Deletion Syndrome Genetic Etiology [ edit ] Caused by the deletion of the long arm of chromosome 18 (or, more often, a section of it) Incidence and Carrier Frequency [ edit[en.wikibooks.org]
  • Ten to fifteen percent of people with 18p- have holoprosencephaly, suggesting that other genetic and environmental facts play a role in the etiology of holoprosencephaly in these individuals. References [ edit ] a b Turleau, Catherine (2008).[en.wikipedia.org]
  • Further documentation of phenotypic abnormalities in subjects with chromosomal aberrations is needed in order to understand the relationship between them and the etiology as well. REFERENCES 1.[tmj.ro]
  • […] behavior; Mental illness; Intellectual disabilities; 4q- syndrome; Rare chromosome disorders Introduction Developmental disorders comprise a heterogeneous group of conditions characterized by an interruption in normal development during childhood with many etiologies[omicsonline.org]
  • Thus, further study is needed to clarify the etiology and the correlation between genes and symptoms. Besides, the patient should be followed up for a long term. Conclusion This report sheds new lights on the del(18p) syndrome.[dovepress.com]


  • Epidemiology of lung cancer 1994,397-412 Marcel Dekker. New York, NY: 276.[aspirantiuditori.forumfree.it]
  • Epidemiology More than 150 patients have been reported worldwide and most cases are no longer subject to publication. The incidence of the disorder could be estimated as about 1:50,000 live-born infants. The female to male ratio is 3/2.[ojrd.biomedcentral.com]
Sex distribution
Age distribution


  • 2006 GASTROINTESTINAL CANCERS SYMPOSIUM Multidisciplinary Approaches to the Prevention, Diagnosis, and Therapy of GI Cancers PROGRAM AGENDA Cancers of the Esophagus and Stomach—Thursday, January 26 Exhibit Hall Open 7:00 AM – 7:00 PM Breakfast Available[finanzaonline.com]
  • Is chronic lung disease in low birth weight infants preventable? A survey of eight centers. ‎ Página 84 - Tanner JM, Whitehouse RH, Marubini E, Resele LF. The adolescent growth spurt of boys and girls of the Harpenden growth study. ‎[books.google.es]
  • Any action that prevents cigarette smoking initiation or promotes cessation among dependent smokers is a step to preventing lung cancer.[aspirantiuditori.forumfree.it]
  • If parents wish to have a child then in vitro fertilization can be advised with embryo biopsy and only healthy embryos are transferred to mother uterus to prevent transmission of 18p deletion. [8] Table 1: Clinical features observed in deletion of the[jisppd.com]
  • Correlations of phenotypes with genotypes can lead to detection of candidate genes which provide insight into disease mechanisms and ideally into the development of strategies for therapeutic intervention and prevention.[els.net]

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