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| branchial cleft cyst ： ウィキペディア英語版 |
branchial cleft cyst
A branchial cleft cyst is a congenital epithelial cyst that arises on the lateral part of the neck due to failure of obliteration of the second branchial cleft (or failure of fusion of the second and third branchial arches) in embryonic development.
==Pathology==
The cyst wall is composed of either squamous or columnar cells with lymphoid infiltrate, often with prominent germinal centers. The cyst may contain granular and keratinaceous cellular debris. Cholesterol crystals may be found in the fluid extracted from a branchial cyst.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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