[Micronodular generalized familial angiomatosis (generalized essential telangiectasia): clinical cases; ultrastructural study].

Six patients of the same family present with micronodular and generalized familial angiomatosis. Four of them have been investigated. Their problem is purely esthetic; however an asymptomatic form of von Willebrand disease has been found in a female and one of her daughters. The light microscope reveals a network of dilated capillaries in the superficial dermis. Electron microscope investigation of the endothelium demonstrates on abundance of Weibel-Palade bodies, the presence of osmiophilic inclusions within clear vacuoles, the occurrence of long spacing collagen fibrils in the vicinity of endothelial and perithelial cells; furthermore, cytoplasmic projections within the lumen constitute the most dramatic and constant feature: there are many villosities, loops, coils, tufts and entanglements in all four cases.