Microscopic histopathologic analyses of<unk> F tumor tissues commonly show repeated patterns of a central zone consisting of spindle-shaped cells lining capillaries and round-to-oval cells arranged around prominent “antler-shaped” vascular spaces all of which are surrounded by a peripheral zone of clustered smooth muscle-like cells. The relative proportions of the two zones can vary within different areas of a tumor and between tumors.<unk> munohistochemical analyses indicate that the spindle-shaped cells strongly express smooth muscle actin, calponin, and, less commonly, desmin proteins.
Infantile myofibromatosis
Acrokeratoelastoidosis of Costa
Metachondromatosis
Familial myxovascular fibromas
Enchondromatosis
Phakomatosis
Juvenile hyaline fibromatosis
Cardiac fibroma