Edit concept Question Editor Create issue ticket


Extragnathic Adamantinoma

Adamantinomas are rare, slow growing malignant bone tumors, which occurs almost exclusively in the long bones.


One of the most common traits of this tumor is its predilection for the long bones. It occurs here in 97% of cases. On the long bones, it focuses on the tibia in 80% -85% of cases. It is therefore its most characteristic clinical feature [5]. In 10% to 15% of cases, the lesion is seen in the ipsilateral fibula. Statistically, this tumor remains prevalent in the tibia but other limb bones have been involved. The involvement of several short bones has been reported on rare occasions as well. In other of decreasing frequency, some other bones that have been involved at appoint or the other includes:

  • The humerus
  • The ulna
  • The femur
  • The fibula
  • The radius
  • The innominate bones
  • The ribs
  • The spine
  • The small bones of the hand and foot

Only six case of spinal adamantinoma have been reported till date [6]. There have also been rare reports of adamantinomas arising exclusively from the pretibal soft tissues without any bony involvement. The initial symptoms of adamantinomas are usually indolent and non-specific.

They are also dependent on the location and extent of the disease. The onset of the disease is insidious and the course shows a slow progressive character.

In many cases the patients endure years of pain before seeking medical attention. In 60% of reported cases, trauma is common place. Apart from the pain reported, many patients also show swelling. The swelling may also be there without the pain.

Due to the involvement of the anterior tibial surface, patients may present bowing deformity of the fibia [7]. In as many as 23% of patients, pathological fracture was present. Other rare cases show paraneoplastic hypercalcemia (linked with tibial adamantinoma) and pulmonary metastasis. In addition to the pain spinal lesions may be manifested by neurologic symptoms.

  • The association of hypercalcemia, hypophosphatemia, decreased parathyroid hormone levels and increased urinary cAMP excretion suggests a humorally mediated hypercalcemia.[ncbi.nlm.nih.gov]
  • Camp MD, Tompkins RK, Spanier SS, Bridge JA, Bush CH. Best cases from the AFIP: Adamantinoma of the tibia and fibula with cytogenetic analysis. Radiographics. 2008 Jul-Aug;28(4):1215-20. Campanacci M: Adamantinoma of the long bones.[orthopaedicsone.com]
Dull Chest Pain
  • The patient, a 69-year-old man, complained of dull chest pain for over 6 months. Chest X-ray and CT film revealed osteolytic mass of the right 7th rib.[ncbi.nlm.nih.gov]
Thyroid Nodule
  • Herein, we report a 72-year-old male who presented with left parotid mass, right neck mass and thyroid nodules.[ncbi.nlm.nih.gov]
Pleural Effusion
  • She came to a primary hospital and was found to have a pleural effusion in her right lung and chest tube was inserted. She was then referred to our hospital.[ijcasereportsandimages.com]
Parotid Mass
  • Herein, we report a 72-year-old male who presented with left parotid mass, right neck mass and thyroid nodules.[ncbi.nlm.nih.gov]
  • Plain radiograph and bone scan showed lesions mimicking stress fracture. Follow-up investigations (repeated plain radiography and three phase bone scan) and histopathological examination proved it as a case of multifocal adamantinoma.[ncbi.nlm.nih.gov]
Leg Pain
  • We are reporting a 25 year old female college student with one and half years history of right mid leg pain and swelling with radiologically and histologically proven adamantinoma of right tibia.[ncbi.nlm.nih.gov]
  • Clinical data: Clinical data: Right leg pain Tenderness over anterior aspect of tibia.[sumerdoc.blogspot.com]
  • Leg pain and swelling in a 22-year-old man. Clin Orthop Relat Res. 2006 Jul;448:259-66. Khanna M, Delaney D, Tirabosco R, Saifuddin A.[orthopaedicsone.com]
Bony Swelling
  • Clinical examination revealed an irregular bony swelling with no ulceration or sinuses over the skin surface. He was further investigated radiographically with plain films and scan.[ijri.org]
  • Clinically they appear as bony swellings without many symptoms. The radiographic appearances of ameloblastoma are variable. Unilocular lesions associated with an impacted tooth can often be mistaken for a dentigerious cyst radiographically.[screening.iarc.fr]
Bone Pain
  • The accused may present with mild bone pain for a few months or few years. Most patients present with local swelling with or without pain.[medicaldb.blogspot.com]
Knee Pain
  • A 74-year-old Asian woman first complained of right knee pain without any cause. Radiographs demonstrated a 4 4.5 cm osteolytic lesion in her medial femoral condyle.[ncbi.nlm.nih.gov]
Neck Mass
  • Herein, we report a 72-year-old male who presented with left parotid mass, right neck mass and thyroid nodules.[ncbi.nlm.nih.gov]
  • A 55-year-old man was admitted to our service with cervical pain and signs of C8 and T1 radiculopathy. On physical examination, cervical spine deformity, swelling in the left mandible region, and signs of C8 and T1 radiculopathy were observed.[ncbi.nlm.nih.gov]


Radiographs are used for confirmatory purposes and they show many lucent lesions that are sharply circumcised. There is often interspersed sclerotic bone in mid tibia. Some lesions also destroy cortex. Bowing of the tibia may be seen as well. The radiographic evolution of lesions often proves helpful in diagnosis as lesions continue to grow and erode through the cortex [8]. Unlike what is seen in most primary bine tumors, adamantinoma doesn’t show any periosteal reaction.

Histological studies are carried out as well and they show fibrous and epithelial tissue in gland like pattern characteristically. Epithelial and mesenchymal cells will be visible too as well as nests of epithelial-like cells arranged in palisading or glandular pattern. A background of fibrous stroma is also common.

Ground Glass Appearance
  • The radiological signs suggestive of fibrous dysplasia such as ground glass appearance, anterior bowing or pseudoarthrosis of tibia were absent. They were excluded only by histopathology.[ijri.org]
  • Axial CT image on the right shows some broadening of the iliac bone with a ground glass appearance and no cortical destruction. Here a patient with polyostotic fibrous dysplasia.[radiologyassistant.nl]
Right Pleural Effusion
  • A chest radiograph was performed (Figure 3) which showed bullae in the superior lobe of the right lung, pneumothorax, fibroatelectasis in the middle lobe of the right lung, and right pleural effusion.[ijcasereportsandimages.com]
Pleural Effusion
  • She came to a primary hospital and was found to have a pleural effusion in her right lung and chest tube was inserted. She was then referred to our hospital.[ijcasereportsandimages.com]


Generally, treatment involves wide resection or amputation. During the course of the disease metastases may occur. This occurs in 30% of cases even though it is rare at presentation. Prognosis and response to treatment is great but the chances are lower when a wide surgical margin cannot be obtained.

Chemotherapy does not work as the tumor is not sensitive to radiation [9]. The only time when chemotherapy is deployed is when the cancer has spread to the lungs or other sensitive organs.


In 25% of cases reported, adamantinomas metastasized into the lungs. This is why long-term followup is highly recommended [4]. With negative margin excision, recurrence is rarely recorded. Majority of children treated surgically for adamantinoma have very positive long term outlook. Their 10 year survival rate is placed around 85%.


The etiology of the tumor is not known and this has added to the controversy surrounding its origin.


The condition is very rare and so, less than 300 cases have been recorded in the past century [2]. Of the documented cases, it has been established that the condition occurs majorly in young adults who are 20-40 years of age.

Sex distribution
Age distribution


Adamantinomas are classified into two main types, the classic and differentiated. Classic adamantinomas is seen in patients already older than 20 years of age but differentiated adamantinomas happen in patients younger than 20. Additionally, these two classifications have distinctive radiographic and histologic differences.

Adamantinoma patients often show varying signs and symptoms. Generally, they report swelling and pain. Since the tumor grows rather slowly, patients often describe discomforts that may have lasted for months or years. Even though it is difficult to figure out an accurate mortality statistics due to the rarity of the tumor, there is 10% 10-year survival rate [3]. When faced with this tumor, medical professionals carry out surgeries which may include either marginal or en bloc resection. Traditional therapy and chemotherapy have not proven effective regarding the effective treatment of the disorder.


There are no proven ways to prevent this but regular exercise of the lower extremities and bone friendly nutrition is recommended.


Adamantinoma is a rare type of tumor and till date, the origin remains a controversial topic. The tumor was first described by Fischer in 1913 [1] and till date, less than 300 cases have been reported. The tumor occurs almost exclusively within the long bones and in 80% of cases, tumors occur in the tibia. The most commonly affected is the diaphyseal region.

Patient Information

Patients are advised to cooperate with medical personnel and accept any procedures recommended by them. Adamantinoma doesn’t respond to chemotherapy, radiation etc. So surgery is the treatment method in most cases [10]. The different types of surgery are:

  • Limb salvage surgery: This focused on helping preserve the limb by removing the tumor and some of the healthy tissue surrounding it.
  • Amputation: This will only be carried out if the tumor involves any major nerves or blood vessels.

If the adamantinoma reoccurs, more surgery will be required.
Healthy individuals are encouraged to immediately report any pain in the lower extremities that have lasted more than a week. This condition must not be confused with arthritis.



  1. Fischer B. Uber ein primares Adamantinom der Tibia. 12. Frankfurt: Zeitschr. f. Path.; 1913:422-441.
  2. Van Rijn R, Bras J, Schaap G, Van den Berg H, Maas M: Adamantinoma in childhood: report of six cases and review of the literature. Pediatr Radiol 2006, 36:1068-74.
  3. Mirra JM: Adamantinoma and fibrous dysplasia. In Bone tumors. 1st edition. Edited by Mirra JM. Lea & Febiger, Philadelphia; 1989:1203-1231.
  4. Fisher B: Primary adamantinoma of the tibia. Z Pathol 1913, 12:422-441.
  5. Schulenburg CA: Adamantinoma. Ann R Coll Surg Engl 1951, 8:329-353
  6. Ryrie BJ: Adamantinoma of the tibia: aetiology and pathogenesis. BMJ 1932, 2:1000-1003
  7. Baker PL, Dockerty MB, Coventry MB: Adamantinoma (so-called) of the long bones. J Bone Joint Surg Am 1954, 36-A:704-20.
  8. Yildiz C, Erler K, Atesalp AS, Basbozkurt M. Benign bone tumors in children. Curr Opin Pediatr 2003; 15:58.
  9. Wyers MR. Evaluation of pediatric bone lesions. Pediatr Radiol 2010; 40:468.
  10. Springfield DS, Gebhardt MC. Bone and soft tissue tumors. In: Lovell and Winter's Pediatric Orthopaedics, 6th, Morrissy RT, Weinstein SL (Eds), Lippincott Williams & Wilkins, Philadelphia 2006. p.493.
  11. Faivre L, Nivelon-Chevallier A, Kottler ML, et al. Mazabraud syndrome in two patients: clinical overlap with McCune-Albright syndrome. Am J Med Genet 2001; 99:132.

Ask Question

5000 Characters left Format the text using: # Heading, **bold**, _italic_. HTML code is not allowed.
By publishing this question you agree to the TOS and Privacy policy.
• Use a precise title for your question.
• Ask a specific question and provide age, sex, symptoms, type and duration of treatment.
• Respect your own and other people's privacy, never post full names or contact information.
• Inappropriate questions will be deleted.
• In urgent cases contact a physician, visit a hospital or call an emergency service!
Last updated: 2019-07-11 22:22