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Purpose: The aim of this article is to report an unusual case of postoperative graft loss into the vitreous cavity after Descemet membrane endothelial keratoplasty (DMEK) in a patient with an unstable iris-lens diaphragm (scleral-fixated intraocular lens [sf-IOL]) and its successful retrieval with a favourable outcome. Methods: This is a retrospective case report. Results: DMEK procedure was performed in a vitrectomized eye of an 80-year-old woman with pre-existing sf-IOL due to pseudophakic bullous keratopathy. In the setting of an inadvertently created oversized Ando iridectomy and unstable iris-lens diaphragm due to sf-IOL, repeated loss of an anterior chamber gas tamponade occurred. At the 3rd postoperative day, the patient noticed a change in visual perception, and we could detect a loss of the graft into the vitreous via B-scan ultrasound. A 23-G vitrectomy was performed promptly to recover the graft using a bimanual hand-over-hand technique. Six months after DMEK, the patient had a clear cornea without dehiscences with a central corneal thickness of 533 µm and endothelial cell count of 1,219 cells/mm2. Conclusions: This case demonstrates the possibility of graft recovery from the vitreous after DMEK and subsequent corneal clearing despite unstable iris-lens diaphragm and vitrectomized eye.