69-year-old male with a history of subtalar joint osteoarthritis presents with left ankle pain, evaluate for peroneal tendon pathology. Again seen is presumed posttraumatic deformity of the calcaneus as well as severe osteoarthritis of the subtalar joint and less severe osteoarthritic changes elsewhere in the ankle and foot, as described in the prior CT report. There is a small rounded focus of abnormal signal intensity within the distal fibula posteriorly that may represent a small cyst. Adjacent small focus of abnormal signal intensity in the soft tissues may represent extension of this cyst. The superior peroneal retinaculum is identified attaching to the fibula. Note is made of a prominent peroneal tubercle measuring just over 5 mm in depth.The peroneal tendons are appropriately situated posterior to the distal fibula. The peroneus longus tendon appears slightly enlarged suggesting mild tendinosis. There is also mild increased signal intensity within the peroneus brevis tendon as it courses beneath the fibular tip indicating mild tendinosis. There is perhaps trace fluid within the peroneal tendon sheath, which is not necessarily abnormal. However, there does appear to be surrounding tenosynovial thickening as the tendons course beneath the fibular tip suggesting a chronic tenosynovitis. The medial tendons appear intact. There is mild spurring of the attachment of the Achilles to the calcaneus, but the tendon appears normal. The anterior tendons are intact.The anterior talofibular and calcaneofibular ligaments appear normal. The posterior talofibular ligament appears thickened and heterogeneous which may reflect prior injury. The distal tibiofibular syndesmotic complex is intact. Loss of striations of the posterior deep tibiotalar ligament may reflect prior sprain. The sinus tarsus is predominantly fatty, which is normal. Diffuse subcutaneous edema about the ankle which extends along the dorsum of the foot
1. Posttraumatic deformity of the calcaneus with subtalar joint osteoarthritis comparable to that seen on the recent CT scan.2. Mild degenerative peroneal tendinosis and chronic appearing tenosynovial thickening without definite tear.3. Other findings as described above.