RT Journal Article SR Electronic T1 Synovial sarcoma of the transverse colon metastatic to the chest wall after 3 years of follow-up JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e239088 DO 10.1136/bcr-2020-239088 VO 14 IS 7 A1 Viviana Marcela Hidalgo Mora A1 David Ricardo Baquero Zamarra A1 Maria Angelica Cendales A1 Carlos Edgar Figueroa AvendaƱo YR 2021 UL http://casereports.bmj.com/content/14/7/e239088.abstract AB We report a fifth case of a transverse colon primary synovial sarcoma. A 31-year-old man with history of grade I obesity presented to an outpatient clinic reporting 6 months of intermittent colicky abdominal pain associated with haematochezia and rectal bleeding. Colonoscopy reported a partially obstructive intraluminal tumour lesion located in the transverse colon. There was no evidence of metastatic disease in the extension studies, so the patient was admitted to the hospital for a laparoscopic subtotal colectomy. Histopathology demonstrated intermediate-grade synovial sarcoma. At the third year of follow-up, the patient presented metastases on the chest wall, which required extensive resection and complementary oncological management.