[Amebic lung abscess: an unexpected diagnosis].

Pleuropulmonary amebiasis is a very rare complication of amebiasis infection and direct pulmonary involvement is exceptional. The clinical diagnosis is difficult without any intestinal or extraintestinal manifestations. A percutaneous drainage is necessary to aspirate pus. We report herein the case of a 56-year-old man presenting with an amebic lung abscess in his right lower lung and pleural effusion. The diagnosis was suspected by our laboratory from a serological assay (antiamebic antibodies reaching 320 by IHA) and established from a direct examination of the pus in which rare trophozoites of Entamoeba were detected. We pointed out the importance of the communication between the clinician and the biologist. Protozoan infection should be suspected in pleuropulmonary infection when antibiotics failed even in France. This patient left endemic area a long time ago and the way of his amebiasis contamination is unknown: recurrence of amebic infection is rare and prevalence in industrialized countries reaches only 1%. Several hypothesis are exposed.