<unk>  is a rare, benign tumor. It may mimic an angiosarcoma, with lesions that are red or purplish 5-mm to 5-cm papules and deep nodules on the head, neck, or upper extremities.
Intravascular papillary endothelial hyperplasia
Obliterating endarteritis
Multifocal fibrosclerosis
Tubular proteinuria
Renal papillary necrosis
Clonal hypereosinophilia
Minimal mesangial glomerulonephritis
Nodular vasculitis