[Above acetabulum aneurismal cyst. One case (author's transl)].

One case of above acetabulum aneurismal cyst is presented and the authors insist on the main features of this benign tumor supplied with radiology, clinic and evolution. Location of such cyst are uncommon: 4 cases upon 137. Medical team has to resolve two problems: on one hand, positive diagnosis of this benign tumor, on the other hand, treatment of this particular location.