Kyste synovial de la bourse retro achilléenne: localisation rare

Synovial cyst of the retroachilles bursa is a cystic formation developing from the retroachilles bursa. It is a rare cause of talalgia which has been very little reported in the literature. We report the case of a 22-year-old woman suffering from rebel left talalgia resistant to medical treatment. Left foot X-ray showed sharp and protruding bony outgrowth above and behind the great calcanean tuberosity. Chauveaux-Liet angle was 16 degrees and the Fowler-Philip angle was 82 degrees. The diagnosis of Haglund's deformity was retained. Dorsal surgery was performed. The cyst of the retroachilles bursa was removed and sent to the laboratory for anatomopathological examination. This confirmed the diagnosis of synovial cyst. The surgical gesture was complemented by removal of bony outgrowth. Patient's clinical outcome was favorable. This study reports a rare and unusual case of synovial cyst in an extra-articular location, complicating Haglund's deformity.