Spindle epithelial tumor with thymus-like elements (SETTLE): a surgical case diagnosed preoperatively using fine-needle aspiration cytology

Spindle epithelial tumor with thymic-like elements (SETTLE) is an extremely rare tumor that occurs primarily in the thyroid gland. Histologically, SETTLE is characterized by the presence of spindle-shaped epithelial cells and glandular structures. However, it is known that diagnosis via fine-needle...

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Main Authors: Fumiaki Kawano, Teru Chiyotanda, Kazuhiko Nakame, Satoru Meiri, Tsuyoshi Fukushima, Kousei Shirahama, Yuichiro Sato, Hideki Yamaguchi, Makoto Ikenoue, Shun Munakata, Kazuhiro Higuchi, Shinsuke Takeno, Atsushi Nanashima
Format: Article
Language:English
Published: Bioscientifica 2025-05-01
Series:Endocrinology, Diabetes & Metabolism Case Reports
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Online Access:https://edm.bioscientifica.com/view/journals/edm/2025/2/EDM-25-0014.xml
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Summary:Spindle epithelial tumor with thymic-like elements (SETTLE) is an extremely rare tumor that occurs primarily in the thyroid gland. Histologically, SETTLE is characterized by the presence of spindle-shaped epithelial cells and glandular structures. However, it is known that diagnosis via fine-needle aspiration cytology can be challenging. SETTLE predominantly occurs in younger individuals and has a less favorable prognosis compared to differentiated thyroid carcinoma. Therefore, ensuring accurate diagnosis and appropriate treatment is crucial. We encountered a case of spindle epithelial tumor with thymus-like differentiation in a 10-year-old patient for whom the preoperative diagnosis was successfully established through fine-needle aspiration cytology, which facilitated appropriate surgical resection. Comprehensive histopathological examination and immunohistochemical analysis are essential to ensure appropriate management and surveillance of SETTLE.
ISSN:2052-0573