Online Aticles: Case Report/Small Case SeriesPartial Schlemm Canal, Trabecular Meshwork, and Descemet Membrane Separation During Gonioscopy-assisted Transluminal Trabeculotomy A Case ReportDönmez Gün, Raziye MD*; Kuğu, Süleyman†; Erkan, Murat MD‡; Şimşek, Şaban*Author Information Departments of *Ophthalmology ‡Pathology, Istanbul Kartal Doctor Lütfi Kirdar Training and Research Hospital †Department of Ophthalmology, Istanbul Haydarpaşa Numune Training and Research Hospital, Istanbul, Turkey The patient signed an informed consent granting the use of data for scientific purposes. Disclosure: The authors declare no conflict of interest. Reprints: Raziye Dönmez Gün, MD, Department of Ophthalmology, Istanbul Kartal Doctor Lütfi Kirdar Training and Research Hospital, Semsi Denizer Street, E-5, Kartal, Istanbul 34890, Turkey (e-mail: firstname.lastname@example.org). Received August 16, 2019 Accepted October 29, 2019 Online date: November 8, 2019 Journal of Glaucoma: January 2020 - Volume 29 - Issue 1 - p e1–e2 doi: 10.1097/IJG.0000000000001405 Buy Metrics Abstract Gonioscopy-assisted transluminal trabeculotomy (GATT) is a surgery that opens the trabecular meshwork (TM) circumferentially after cannulation of the Schlemm canal (SC) with a flexible illuminated microcatheter or suture. The main purpose of this case report was to describe a new complication of GATT. Herein, we report a case of partial SC, TM, and Descemet membrane (DM) separation during GATT. The patient was a 60-year-old man with a history of glaucoma who underwent GATT. SC, TM, and DM separation occurred intraoperatively during 360 degrees trabeculotomy. The separated tissue fragment was removed from the anterior chamber and later confirmed to be a part of the SC, TM, and DM by histopathologic examination. In our patient, this complication did not cause surgical failure. Various complications associated with GATT have been reported previously. Partial SC, TM, and DM separation may occur during this surgery. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.