RESUMEN
INTRODUCTION: Synovial osteochondromatosis is a rare condition characterized by the formation of multiple cartilaginous nodules, which involves metaplastic changes of the synovium and is commonly found in larger joints. Occurrence in foot and ankle is uncommon, even less in metatarsophalangeal joints. CASE REPORT: A 54-year-old woman with primary synovial osteochondromatosis in the first metatarsophalangeal joint was treated by complete excision plus synovectomy. After 8years of follow-up, the patient remains symptom free with no recurrence observed. A summary of the case and review of all published cases found in the current literature around this location is discussed. CONCLUSION: Though rare, synovial chondromatosis should be considered as a differential diagnosis in a refractory synovitis and tumor mass in the metatarsophalangeal joint of the hallux.