75 male with right foot drop. Evaluate for compressive lesion around the peroneal nerve. No bone marrow signal abnormality is identified. Although this examination was not protocoled for detailed evaluation of the knee, there is full-thickness articular cartilage degeneration along the medial and lateral facets of the patella with underlying degenerative subchondral signal abnormality. There is also apparent near full-thickness to full-thickness articular cartilage degeneration affecting the femoral trochlea.There is increased signal abnormality within the tibialis anterior, extensor digitorum, and peroneal muscles just proximal to the level of the myotendinous junction which is nonspecific but can be seen in subacute denervation injury. The imaged portions of the peroneal nerve are unremarkable. No focal mass lesions are identified in the surrounding area, as clinically questioned. There is also increased signal abnormality on fluid sensitive sequences within the vastus medialis musculature, which is nonspecific. There is fatty infiltration of the gastrocnemius and soleus musculature, particularly affecting the medial head of the gastrocnemius. There is a lobulated focus of fluid signal intensity along the posterior and medial aspect of the proximal tibia, likely representing ganglion formation.
1. Increased signal abnormality within the tibialis anterior, extensor digitorum, and peroneal muscles just proximal to the level of the myotendinous junction which is nonspecific but can be seen in subacute denervation injury. No focal mass lesion is identified in the vicinity of the peroneal nerve as clinically questioned.2. Moderate fatty atrophy of the gastrocnemius and soleus musculature. Other findings as described above.