Mass in the right popliteal fossa.
Findings:
A 6 x 9.1 x 16.6cm (AP x TD x CC) well-circumscribed lobulated mass lesion is seen in the popliteal fossa. It is T1W and T2W hyperintense. It is suppressed on T2W fat saturation images. Internal septae, which are T1W hypointense and T2W hyperintense, and enhancing are seen within the mass. A prominent feeding vessel is seen extending into the mass. The feeding vessel is likely arising from the popliteal vessel. The mass does not extend into the popliteal fossa, knee joint or bones. Findings are in keeping with fat containing neoplasm and could represent lipoma or liposarcoma. Suggest correlation with histology.
No other focal mass lesion is visualized in the popliteal fossa.
The anterior and posterior horns of the medial and lateral menisci present with normal triangular configurations and have homogeneous internal structure of low signal intensity. No meniscal tear is seen. No double PCL is evident.
The anterior and posterior cruciate ligaments are intact with normal signal intensity.
The medial and lateral collateral ligaments are intact with no abnormal signal intensity. No meniscocapsular separation is evident.
The medial and lateral patella retinacula are unremarkable.
The patellar tendon and quadriceps tendon are intact.
The cartilages covering the patella, femoral condyles, and tibial plateau are normal in outline and signal intensity. No chondromalacia is evident.
There is no joint effusion or bursa distension.
Bony alignment is normal. No bony fracture or dislocation is seen. No abnormal signal intensity is noted in the bone marrow.
Comments:
1. A 16.6cm fat containing neoplasm is seen in the popliteal fossa. It could represent a lipoma or liposarcoma. Suggest correlation with histology.
2. No MRI evidence of ligament or meniscal tear.
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