Sclerosed hemangioma and sclerosing cavernous hemangioma of the liver: a comparative clinicopathologic and immunohistochemical study with emphasis on the role of mast cells in their histogenesis

Liver
H R Makhlouf, Kamal G Ishak

Abstract

Sclerosed hemangiomas of the liver are rare. To date, their histopathology, immunohistochemistry, and the role of mast cells (MC) in their histogenesis have not been systematically studied. Clinical, histopathologic and immunohistochemical features of 20 sclerosed hemangiomas were compared with those of 18 sclerosing cavernous hemangiomas. The number of MC was quantified and compared in all cases, using a tryptase immunostain. Compared to patients with sclerosed hemangiomas, those with sclerosing hemangiomas were younger (mean age, 63 versus 71 years); had larger tumors (mean 6 +/- 4.73 versus 3 +/- 2.2 cm); presented with a mass more frequently, and epigastric pain less frequently. Sclerosing hemangiomas, but not sclerosed hemangiomas, were more frequent in males than in females. Sclerosing hemangiomas occurred much more frequently in the right lobe than sclerosed hemangiomas. Sclerosing hemangiomas had less fibrosis, hyalinization, and elastic fibers than sclerosed hemangiomas (p = 0.00004). Numerous thick-walled blood vessels were a feature of sclerosed hemangiomas but not of sclerosing hemangiomas. Collagen IV, and laminin were more uniformly positive in sclerosing hemangiomas than in sclerosed hemangiomas. Increased immuno...Continue Reading

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