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[Vol.32 No.9 content]

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Article in English

- Original article -

Epithelioid Cell Histiocytoma with Underlying Artery Damage

Yoshihiro Miura, Noriyuki Misago and Yutaka Narisawa
Division of Dermatology, Department of Internal Medicine, Faculty of Medicine, Saga University, Saga, Japan.
Although epithelioid cell histiocytoma is considered a variant of fibrous histiocytoma (dermatofibroma), the histogenesis of this condition remains controversial. A recent investigation suggested the possibility that epithelioid cell histiocytoma is an angioformative fibrous histiocytoma. We report a case of epithelioid cell histiocytoma underlying a damaged artery. This epithelioid cell histiocytoma with a central area of hemorrhage was associated with a medium-sized artery in the reticular dermis running vertically up to the lesion. Both the artery in the reticular dermis and its centrally branched artery in the subcutaneous tissue showed mural injury and intraluminal epithelioid endothelial proliferation. Immunohistochemically, the labeling rate for each of the antibodies studied in the epithlioid cells was as follows: 40% for Factor XIIIa, 5% for CD34, 20% for factor VIII-related antigen, and 10% for α-smooth muscle cell actin. This case may support the view that epithelioid cell histiocytoma is a vascular and angioformative fibrous histiocytoma.
key words: epithelioid cell histiocytoma; Factor XIIIa; fibrous histiocytoma; damaged artery; vascular injury

Received February 4, 2005; Accepted for publication March 31, 2005
Reprint requests to: Noriyuki Misago, M.D., Division of Dermatology, Department of Internal Medicine, Faculty of Medicine, Saga University, Nabeshima 5-1-1, Saga 849-8501, Japan.

J Dermatol 32 (9): 721-726, 2005

Japanese Dermatological Association
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