[Lumbar dracunculosis. Apropos of a case].

A young boy of 15 is examined because a swelling of the right lumbar fossa, of which etiology was not established. As a matter of fact, this swelling was the abscess wrapping up the anterior tip of a Medina filaria, which was rooted out by the patient himself in one step and without complication. Delay in diagnosis is explained by the lack of dracunculosis in the area, and by the migratory habits of this young patient who did consider his filariosis as a benign occurrence.