La synovite villonodulaire (SVN) est une proliféra-tion synoviale localement agressive d'étiologie inconnue, pouvant toucher les articulations, les gaines tendineuses et les bourses. Sa localisation à l'articulation subtalaire est extrêmement rare. L'imagerie par résonance magnétique est réputé être performante pour la confirmation diagnostique et la limitation de la zone tumorale grâce aux anomalies de signal spécifiques des dépôts d'hémosidérine retrouvés au sein de la SVN. Nous rapportons l'observation d'un patient de 35 ans qui présentait des douleurs de la cheville droite. Le diagnostic de SVN sub-talaire retenu après étude histologique d'une pièce biopsiquea justifié la synovectomie chirurgicale dix huit mois après l'intervention ; le patient était asymptomatique. Pour citer cette revue : Méd. Chir. Pied 27 (2011). Mots clés Synovite villo nodulaire · Tumeur bénigne · Articulation sub-talaire · IRMAbstract Pigmented villonodular synovitis (PVNS) is a locally aggressive synovial proliferative disorder of unknown aetiology affecting the linings of joints, tendon sheaths, and bursae. PVNS is rare in foot and ankle with few case reports in the literature. We present a case of PVNS in an unusual location, the right ankle. Radiographic findings were suggestive of an unspecified tumor of the ankle region because of extensive soft tissue hypertrophy and bone erosion. Histology findings were in keeping with PVNS and the patient underwent surgical excision. To cite this journal: Méd. Chir. Pied 27 (2011).
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