[Angiomyolipoma of the kidneys]

The histological structure and histogenesis of three renal angiomyolipomas have been studied. Of special interest are peculiar small cells showing all kinds of transition to mature components of angiomyolipoma: fat tissue, smooth muscles, vessels. These cells are referred to as cambial tumor elements, which presumably arise from mature renal tissues of the mesodermal nature through their dedifferentiation. The specific feature of angiolipomas as true tumors is varied differentiation of the tumor cambium that conditions great variety of their histological structure.