Herpes simplex virus lymphadenitis mimicking tumoral relapse in a patient with Hodgkin's disease in remission.

A patient treated for Hodgkin's disease and presenting 12 years later with a left inguinal lymphadenopathy mimicking a relapse is reported. Histopathological study disclosed large histiocytic granulomas in the sinuses. Some of these granulomas showed necrotic areas with numerous neutrophils. At the edge of the necrotic zones, cells of undetermined origin exhibited intra-nuclear inclusions typical of Herpes simplex virus. The diagnosis was confirmed by immunolabelling, revealing Herpes simplex viral antigens in frozen and paraffin sections, and by ultrastructural studies. The diagnostic value of the histological methodology and pathological changes and the significance of the disease, appearing in a patient treated for Hodgkin's disease are discussed.