• Fengtian Zhang, Xiaolong Yu, Jin Zeng, and Min Dai.
• Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Artificial Joints Engineering and Technology Research Center of Jiangxi Province, Nanchang, Jiangxi, China.
• Medicine (Baltimore). 2017 Nov 1; 96 (47): e8759.

RationaleTeratomas, which most frequently affect adult females, are the most common type of germ cell tumor, it always comprises derivatives of at least 2 germ layers. The most common site of primary teratomas is the ovary. Sacrococcygeal teratomas (SCTs), which are exceedingly rare in adults, are generally found in newborns or children.Patient ConcernsA 39-year-old woman presented to our clinic with a 1-year history of gradually aggravated difficulty in micturition and defecation, and a tumor in her right buttock present since birth. Appropriate preoperative examinations showed a large (15.6 cm × 12.2 cm × 30.0 cm) multicystic SCT.DiagnosesHistologic examination confirmed a mucinous tumor arising in a giant SCT.InterventionsAbdominoperineal rectal resection was performed.OutcomesThe patient recovered well and was discharged on day 33 of admission.LessonsWe report the first case of a mucinous tumor arising in an SCT, in which the teratoma presented mature tissue elements derived only from the endodermal germ layer (keratinous debris).Copyright © 2017 The Authors. Published by Wolters Kluwer Health, Inc. All rights reserved.

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