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KMID : 0357919900240010050
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Korean Journal of Pathology
1990 Volume.24 No. 1 p.50 ~ p.57
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Ectopic Hamartomatous Thymoma: A case report.
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Kim Joon-Mee
Won Nam-Hee
Paik Seung-Yong
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Abstract
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Ectopic hamartomatous thymoma is a distinctive benign lesion of lower neck which is firstly described by Rosai et al., in 1984. Its microscopic findings are characterized by four components: cellular areas made up of spindle cells; epithelial islands composed of solid nests, trabeculae, and cysts; mature adipose tissue; and Iymphocytes, sometimes
arranged in a Hassall’s corpuscle-like fashion. The spindle cell components are compatible with epithelial cells which are demonstrated by electron microscopy and immunohistochemistry. So, this lesion is suggested for thymic hamartoma which is ectopically arrested at cervical portion during the migration in embryonic Period.
We recently experienced a case of anterior neck mass which showed the above histologic. features of ectopic hamartomatous thymoma, microscopically. The spindle cells also revealed epithelial nature by electron microscopy and immunohistochemistry This lesion is so rare and only five cases haute been reported in English literatures, and it is
the first case in our country.
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