[Aneurysmal cyst of the clavicle : an uncommon lesion and a difficult diagnosis (author's transl)].

The authors describe a case of anevrysmal cyst of the clavicle seen in a five-year-old girl. Both clinical and radiological diagnosis proved impossible. Complementary investigations did not settle the question. surgical excision was decided on. In spite of an unfavorable macroscopic aspect, histological examination determined the nature of the tumor. The authors emphasize the great value of resorting to all branches of medical investigation when dealing with bone tumors. Before affirming a good prognosis, or, on the opposite, suggesting extensive and mutilating surgery, the utmost caution is required.