June 30, 2010

Cortical Desmoid

Lateral view of the knee radiograph shows focal cortical irregularity and thickening at the posterior aspect of the medial condyle of the femur (arrow), consistent with a cortical desmoid. The arrowhead points to a fabella.

Facts: Cortical Desmoid
  • Considered to be an avulsion of the medial supracondylar ridge of the distal femur
  • Occurs only on the posteromedial epicondyle of the femur (insertion of adductor magnus aponeurosis)
  • Common in older children
  • Patients may complain of pain, or being asymptomatic (incidentally detected on radiograph done for other reasons)
  • They may or may not show periosteal reaction; 1-3 cm in size, mixed sclerosis and lucency in the cortex
Helms CA. Fundamentals of skeletal radiology, 3rd edition, 2005.

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