[A rare case of aneurysm of the superficial femoral artery with dysplasic etiology].

The most frequent localisation of fibrous dysplasia of the arteries is at the renal arteries. Other localisations are rarer and those at the femoral as in the case described are exceptional. The case was observed in a 21-year-old woman who, in the absence of any previous traumatism and septic state, noticed the onset of a pulsating tumefaction at thigh level. Echography and arteriography showed the tumefaction to be an aneurysm of a collateral of the superficial femoral artery at the lower IIIrd of the thigh with the dimensions of a pigeon's egg. The aneurysm was successfully removed without the need for grafts and subsequent histological examination showed it was secondary to fibrous dysplasia. The rarity of such a clinical case is stressed.