Osteochondroma - knee joint

Case contributed by Dr Mostafa El-Feky


Painful right knee.

Patient Data

Age: 30 years
Gender: Male

Right knee joint

A (1.2 x 1.6 x 1.9 cm) sessile bony outgrowth is seen projecting from the lateral part of the supracondylar region of right femur, showing regular overlying cartilaginous cap averaging 7 mm in thickness, reflecting osteochondroma.

Case Discussion

Distal femoral supra-condylar sessile osteochondroma with no suspicious MRI features, as described.

A mnemonic for malignant (sarcomatous) transformation: GLAD PaST

  • G: growth after skeletal maturity
  • L: lucency (new)
  • A: additional scintigraphic activity
  • D: destruction (cortical)
  • P: pain after puberty
  • a: and
  • S: soft tissue mass
  • T: thickened cartilage cap >1.5 cm
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Case information

rID: 79104
Published: 16th Sep 2020
Last edited: 16th Sep 2020
Inclusion in quiz mode: Included
Institution: Dar El Ashaa Center

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