RT Journal Article SR Electronic T1 Endoscopic resection of tendon xanthoma in the elbow of a patient with cerebrotendinous xanthomatosis JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e244931 DO 10.1136/bcr-2021-244931 VO 14 IS 11 A1 Katsumasa Nakazawa A1 Koichi Yano A1 Yasunori Kaneshiro A1 Hideki Sakanaka YR 2021 UL http://casereports.bmj.com/content/14/11/e244931.abstract AB We describe the case of a 44-year-old woman with cerebrotendinous xanthomatosis (CTX) who had a tendon xanthoma on the right olecranon. The patient successfully underwent endoscopic resection. There were no signs of recurrence on MRI 2 years postoperatively. There were no complications related to the surgery, and the patient is completely satisfied with the treatment outcomes. CTX, a genetic metabolic disorder, is associated with the development of tendon xanthomas. Endoscopic resection of tendon xanthoma in the elbow of patients with CTX is a less invasive method than open resection.