外毛根鞘癌: シンポジウムのまとめ

概要

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As representative malignant neoplasms of outer root sheath, malignant trichilem-moma (MT) and malignant proliferating trichilemmal cyst (MPTC) are listed in standard classification. Disease names such as trichilemmal carcinoma and malignant proliferating trichilemmal tumor (MPTT) are also used by some authors. Many cases of MT have been recently reported in Japan, however, definition and criteria of MT seem to be different among the authors. To settle this confusion, a consensus symposium on “trichilemmal carcinoma” was held at the 10th Annual Meeting of the Japanese Society for Skin Cancer in June, 1994. In this paper, as a organizer of the symposium, I summarized the 8 speakers opinions on MT and MPTC/MPTT presented in the symposium. The concept and criteria of these neoplasms were substantially different among speakers and, accordingly, relationship between MT and MPTC/MPTT was controversial. It is important that, to avoid confusion, we clearly define the concept and definition of these neoplasms when we describe them.