Adamantinoma is a low-grade malignancy that is found almost exclusively in the tibia and fibula of young adults. Histologically, it is distinguished from other bone tumors by the presence of clusters of epithelial cells. Treatment is wide resection of the involved bone.
DIAGNOSTIC FEATURES
History
Young adults, with an average age of 35 years
Presents with pain and occasionally swelling
Location
Diaphyseal to metadiaphyseal, intracortical
Medullary involvement and often soft tissue mass
Distribution: The most common site is the tibia (80% to 85%) or tibia plus fibula (5%)
Margins
Geographic lytic component can have variable margins
Can demonstrate expansile remodeling and cortical thickening
Matrix
Mixed lytic and sclerotic
IMAGING
AP x-ray ( left ) showing the intracortical location of an adamantinoma with variable margins.
Sagittal CT reconstruction showing more clearly the intracortical origin of the tumor and a longitudinal growth pattern ( right ).
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