[Amyloidosis cutis nodularis atrophicans (Gottron)].

We report an exceptionally severe case of amyloidosis cutis nodularis atrophicans (Gottron) of the lower limbs in a 49-year-old female patient. The diagnosis was made on clinical and histological grounds and was confirmed by immunohistochemical evidence of amyloid of the A-lambda type. For the first time, cutaneous microcirculation in the region of the nodules was investigated by means of fluorescence video microscopy. Pronounced microangiopathy characterized by avascular fields, enlarged and tortuous capillaries and increased transcapillary diffusion of sodium fluorescein, was clearly demonstrable in the area of the nodules. The pathogenetic role of these vascular changes is discussed.