Peroneal tendinitis TENDONS: There is thickening and abnormal signal of the peroneal tendons, particularly the longus just distal to the peroneal tubercle. There is no evidence of a full-thickness tear. Mild fluid surrounds both the peroneal tendons reflecting a component of mild tenosynovitis.LIGAMENTS: No significant abnormality noted.ARTICULAR SURFACES AND BONE: Abnormal marrow signal and irregularity of the peroneal tubercle is noted although a discrete fracture line is not visualized. Additional abnormal marrow signal is noted within the metatarsal of the visualized fourth metatarsal again with no discrete fracture line identified. Severe osteoarthritis affects the third and fourth MTP joints with associated reactive marrow and degenerative cystic change.ADDITIONAL
1. Abnormal thickness and signal of the peroneal tendons with surrounding fluid representing a combination of tendinosis and possible split tearing with associated mild tenosynovitis. There is no evidence of full-thickness tear. The remaining tendons of the ankle are intact.2. Abnormal signal within the peroneal tubercle without discrete fracture line likely representing stress injury. Similar abnormal marrow edema is noted within the base of the fourth metatarsal which is incompletely visualized but also likely represent stress injury.3. Severe degenerative changes of the third and fourth MTP joints.