title: Masson's intravascular vegetant hemangioendothelioma.
abstract: Eleven cases of Masson's hemangioendothelioma are reported. This benign condition must be distinguished histologically from numerous malignant endothelial lesions. Two different papillary structures were observed; one defined as "inflammatory papilla" was constantly associated with a thrombus; the other, defined as "fibrous papilla" was observed in 4 cases where no thrombus could be found. It is postulated that the inflammatory papillae are an exuberant endothelial growth during the normal organisation of a thrombus; fibrous papillae, it is suggested, might be reactive to blood or lymph stasis.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001164:Arteriovenous Fistula / Q000175:diagnosis; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006099:Granuloma / Q000175:diagnosis; D006390:Hemangioendothelioma / Q000473:pathology*; D006392:Hemangioma, Cavernous / Q000175:diagnosis; D006801:Humans; D008202:Lymphangioma / Q000175:diagnosis; D008297:Male; D008875:Middle Aged; D010386:Pelvic Neoplasms / Q000473:pathology; D012878:Skin Neoplasms / Q000473:pathology*; D013927:Thrombosis / Q000175:diagnosis; D014652:Vascular Diseases / Q000175:diagnosis