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.

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La maladie de Haglund est une pathologie caractérisée par une excroissance osseuse postéro-supérieure du calcanéum, induisant un conflit avec le tendon d´Achille, et se manifestant principalement par une talalgie postérieure. Nous rapportons l´observation d´une jeune femme de 28 ans suivie pour spondylarthrite ankylosante, avec une maman suivie pour la même maladie systémique, et une tante maternelle opérée pour maladie de Haglund. La patiente a trop trainée pour avoir le diagnostic vu que la talalgie a été considérée comme enthésite de sa maladie de système. La patiente ne s´est pas améliorée sous traitement médical. La chirurgie nous a donné des résultats satisfaisants. Ce qui soulève les hypothèses du caractère génétique et héréditaire du syndrome de Haglund, et sa relation avec la réponse au traitement médical.

Humero-radioulnar synostosis is a rare deformity of the upper limb. The synostosis of the elbow is a malformation that may happen between any of the bones of this joint. The most common one is radioulnar synostosis. Humero-radioulnar synostosis has been very little reported in the literature. We report the case of a 32 years old man with a condition of phacomolia, consulting in the emergency room, for pain of the left upper limb after a light football trauma. The patient also had craniosynostosis of the lambdoid suture. Left-arm X-ray showed a bifurcating humerus, with ulnar deficiency, and non-displaced radial and ulnar fractures, successfully treated with a cast for 6 weeks. This study reports a rare and unusual case of Humero-radioulnar synostosis, in a patient with no family history of malformations.