There is a large low signal intensity mass lesion extending from the pelvis to the thigh, knee and proximal leg, with heterogeneous enhancement in the posterior soft parts of the left upper leg.
The lesion slightly displaces the adjacent muscles especially the hamstring muscles and the medial gastrocnemius muscle in the lower leg it shows close contact with the vascular structures and nerves with displacement of the same in some sectors. It also displays close contact with the bony structures including the femoral diaphysis and condyles, the posterior tibial plateau and the proximal fibula.
Fatty changes are observed in the left soleus, flexor hallux longus, and tibialis posterior muscles; which suggests chronicity of the injury.
Cystic lesion in the proximal tibiofibular joint probably in keeping with a ganglion cyst.