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Background  Gonioscopy-assisted transluminal trabeculectomy is a novel and useful technique for ab interno trabeculotomy. However, gonioscopy-assisted transluminal trabeculectomy is difficult to perform in patients with corneal opacity or in patients with sequelae of cerebral infarction and cervical osteoarthritis with severe limitation of spinal mobility. This is because observing Schlemm’s canal during surgery using gonioscopy is difficult. In this report, we introduce a new and beneficial surgical technique of transluminal trabeculotomy for these patients, using an ophthalmic endoscope for cases in which normal gonioscopy-assisted transluminal trabeculectomy is difficult.    Case presentation  Our patient was a 65-year-old Japanese man with cervical osteoarthritis with severe limitation of spinal mobility who showed primary open-angle glaucoma of the right eye. He had limited conversion of his head during surgery because of complications. Therefore, we performed transluminal trabeculotomy using an ophthalmic endoscope. Finally, ab interno trabeculotomy of 200 degrees was achieved by this method, and an average reduction in ocular pressure of 60% from baseline was achieved after surgery, with no major complications.    Conclusions  This surgical technique may be useful as an alternative method for normal gonioscopy-assisted transluminal trabeculectomy in difficult cases.    Electronic supplementary material  The online version of this article (10.1186/s13256-019-2186-5) contains supplementary material, which is available to authorized users.

Observation of Schlemm’s canal and transluminal trabeculotomy using an ophthalmic endoscope: a case report