Synovial chondromatosis in the flexor hallucis longus of the foot: A rare finding

Synovial chondromatosis is an uncommon lesion characterized by cartilaginous metaplasia of the synovial layer with the usual formation of free osteocartilaginous bodies and typically involving large joints. Location in the ankle and foot is rare and, in turn, very rare in the synovial sheath of the foot tendons. The diagnosis of this little recognized entity is of great importance because it is a progressive condition that carries a substantial risk of local recurrence. Imaging tests such as CT or MRI help to identify the characteristic findings and the exact location to guide the orthopaedic surgeon in surgery. Its definitive treatment is surgical, through complete resection of the synovium (synovectomy).