Presentation
Knee pain for 6 months. No significant trauma. On examination was found to have quadriceps weakness. Ultrasound was advised.
Patient Data
Intra-articular lesion of pediatric knee
The upper pole of the patella appears to be pushed anterior and distally.
Intra-articular lesion of pediatric knee
An ovoid solid lesion in the suprapatellar region.
Color flow examination shows a single vessel within the center of the lesion.
Case Discussion
US - There is a solid lesion in the suprapatellar region deep to the quadriceps tendon. The lesion is anterior to the distal end of the femur. Patella is noted at the lower pole of the lesion separately. No effusion is seen in the joint. Quadriceps and patellar tendons and Hoffa's fat pad normal.
MR - Non contrast study - Similar findings regarding morphology. Images are NOT available to upload.
Arthroscopy - Lesion was excised. No other abnormality apart from this lesion during the scope.
After all of the above workup, the final proven diagnosis is synovial sarcoma of the knee.
Histopathology -Synovial sarcoma
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