RT Journal Article SR Electronic T1 Concurrent leiomyosarcoma causing small bowel obstruction in a patient with non-Hodgkin lymphoma JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e261728 DO 10.1136/bcr-2024-261728 VO 18 IS 1 A1 Sealey, Andrew A1 Davis, Sean Stuart A1 Naidu, Krishanth YR 2025 UL http://casereports.bmj.com/content/18/1/e261728.abstract AB Small bowel obstruction (SBO) is a leading cause of general surgery inpatient admissions. SBO is most commonly associated with postoperative adhesions; however, neoplastic SBO is an important differential. Here, we present a case of neoplastic SBO secondary to leiomyosarcoma in a patient with known mature B cell lymphoma. This case highlights the importance of avoiding early diagnostic closure and adherence to oncological principles of resection for small bowel tumours.