Masroor I, Hashmi R.
View Box Case - 6.
J Pak Med Assoc Jan ;52(6):266-8.

A 29 years old male presented with complaints of painful swelling of right knee and limitation of movement for 6 weeks. The laboratory findings were unremarkable. Plain film of the right knee showed an expansile soap-bubble pattern lytic lesion measuring 11.5x7cm involving the medial condyle of right femur in sub-articular location. There was thinning of overlying cortex without any breaks or periosteal reaction, with associated soft tissue swelling. An MR examination for pre-operative mapping revealed replacement of medial condyle of femur by tumor tissue. There was extension of tumor into the joint space. The neurovascular bundle was displaced with no evidence of invasion. The tumor was hypointense on T1-weighted images and hyperintense on T2-weighted images and showed homogneous enhancement on post-contrast T1-weighted images. The tumor was resected and the defect in the bone filled in by bone chips. Diagnosis: Giant cell tumor.

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