Intracapsular chondroma - knee

Case contributed by Dr Ammar Haouimi


Pain of left knee with intermittent locking.

Patient Data

Age: 15 years
Gender: Male

The MRI sequences demonstrate a well-defined intra-articular mass within the infrapatellar (Hoffa's) fat pad. It shows slight high signal on T1, T2, T2 GE, and DP fat sat as compared to the muscles (isointense to the articular cartilage) with a peripheral area of low signal mainly on T2, and T2 GE. No enhancement is seen on postcontrast sequences.

A significant joint effusion is noted with synovial enhancement.

A multiseptated cystic structure in contact with the dorsal aspect of the proximal posterior cruciate ligament (PCL) is noted, suggestive of a posterior cruciate ligament (PCL) ganglion cyst.

No meniscal or ligamentous lesion seen.

Case Discussion

MRI features are most consistent with an intracapsular chondroma with knee joint effusion, and a posterior cruciate ligament (PCL) ganglion cyst.

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Case information

rID: 69385
Published: 10th Jul 2019
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included
Institution: Aurès Medical Imaging Center - Batna Algeria

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