[Bacillary angiomatosis: apropos of a case].

We report a case of bacillary angiomatosis (BA), a recently described opportunistic infection, in a 30-year-old patient with Aids who was referred for a purplish vascular nodule on the forehead, of one-month duration, surrounded by similar smaller papules. For the previous 4 months he had suffered from progressive cachexia with fever, chills, night sweats, arthralgias and bone pain for which no infectious or malignant cause had been discovered after an extensive medical work-up. Histological examination of the skin lesions using Warthin-Starry staining revealed lobular vascular proliferation and protuberant endothelial cells with clumps of small bacilli. These findings were confirmed by electron microscopy. We believe that this is the first case of BA diagnosed in Switzerland and discuss the skin lesions, systemic symptoms and evolution under antibiotic treatment.