[Systemic necrobiotic xanthogranuloma with initial pericardial and pulmonary involvement].
INTRODUCTION: Necrobiotic xanthogranuloma is a rare disease, usually associated with a monoclonal gammapathy. We report a case with pericardial and pulmonary involvement that preceded the appearance of the cutaneous lesions. OBSERVATION: A 58 year-old woman was hospitalized for cardiac tamponade. She has a past history of a ductal carcinoma of the right breast that had been completely cured. Pericardial and pulmonary samples showed a predominantly histiocyte monomorphous infiltrate. Twelve months later, indurated papular-like cutaneous lesions appeared around the eye orbits and on the thorax. The histological examination of the skin revealed a necrobiotic xanthogranuloma and the diagnosis of cutaneous and visceral necrobiotic xanthogranuloma was retained. The patient exhibited an IgG Kappa monoclonal gammapathy of undetermined significance. Sequential treatment with melphalan and general corticosteroids moderately improved the cutaneous lesions but did not modify the monoclonal peak. DISCUSSION: To our knowledge, this is the first case of pericardial involvement of a necrobiotic xanthogranuloma. The discovery of the disease, revealed by a visceral manifestation at the onset is uncommon. The subsequent appearance of typical cutaneous lesions permits the retrospective diagnosis of systemic necrobiotic xanthogranuloma. Because its diagnosis is difficult in the absence of concomitant cutaneous involvement, visceral localizations of the disease must be recognized.