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Case Reports
. 2003 Sep;127(9):e378-81.
doi: 10.5858/2003-127-e378-EHTACR.

Ectopic hamartomatous thymoma: a case report showing CD99+ lymphocytes and a low proliferation index

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Free article
Case Reports

Ectopic hamartomatous thymoma: a case report showing CD99+ lymphocytes and a low proliferation index

Shi Nae Lee et al. Arch Pathol Lab Med. 2003 Sep.
Free article

Abstract

Ectopic hamartomatous thymoma is a rare benign tumor that consists of spindle, epithelial, and adipose cell elements. We present a case of this lesion arising in the supraclavicular region of a 59-year-old man, including the characteristic immunohistochemical and ultrastructural findings. DNA flow cytometry revealed diploidy with a low proliferation index (6.73%). The tumor contained CD99+ lymphocytes; CD99 (MIC2) can serve as a useful marker of immature T cells. These findings suggest that ectopic hamartomatous thymoma may develop from the third branchial pouch or thymic anlage.

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