{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T09:02:57Z","timestamp":1773392577024,"version":"3.50.1"},"reference-count":4,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2026,2,19]],"date-time":"2026-02-19T00:00:00Z","timestamp":1771459200000},"content-version":"vor","delay-in-days":18,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"},{"start":{"date-parts":[[2026,2,1]],"date-time":"2026-02-01T00:00:00Z","timestamp":1769904000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Respirology Case Reports"],"published-print":{"date-parts":[[2026,2]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Tracheal adenoid cystic carcinoma (ACC) often shows submucosal extension, leading to positive margins. A male patient presented with dyspnea due to an intraluminal tumour arising from the membranous mid\u2010trachea. Rigid bronchoscopy debulking confirmed ACC. In a second\u2010stage operation, circumferential resection of approximately 3.8\u2009cm of trachea with end\u2010to\u2010end anastomosis achieved macroscopic clearance. Intraoperative frozen sections, however, revealed tumour cells within lymphatic channels of the tracheal sheath at the distal cartilaginous\u2010side margin opposite the membranous lesion, precluding further resection because of the limit of safe tracheal length. The anastomosis was therefore completed with anticipated microscopic residual disease, and postoperative radiotherapy from the anastomosis to the carina was delivered. The patient remains recurrence\u2010free at follow\u2010up. This case highlights circumferential extramural lymphatic spread of tracheal ACC and underlines the importance of systematic intra\u2010 and postoperative pathological assessment and of considering tracheal sheath and peritracheal tissue in defining resection and adjuvant strategies.<\/jats:p>","DOI":"10.1002\/rcr2.70513","type":"journal-article","created":{"date-parts":[[2026,2,19]],"date-time":"2026-02-19T13:41:21Z","timestamp":1771508481000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Circumferential Extramural Spread of Tracheal Adenoid Cystic Carcinoma Causing Unexpected Positive Margin"],"prefix":"10.1002","volume":"14","author":[{"given":"Go","family":"Kamimura","sequence":"first","affiliation":[{"name":"Department of General Thoracic Surgery Graduate School of Medical and Dental Sciences Kagoshima University  Kagoshima Kagoshima 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