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Introduction Posterior communicating artery (PCoM) aneurysms pose a unique therapeutic challenge due to their proximity to critical vascular branches and variable morphology. Flow diverters have emerged as a viable treatment option for multilobulated intracranial aneurysms. However, complications such as incomplete device expansion, migration of the device and occlusion of normal arteries can affect treatment efficacy and long-term outcomes.Abstract C88 Figure 1Case Description We report the case of a 70-year-old woman who presented with left side third cranial nerve palsy. Imaging revealed a 6.3 mm multilobulated saccular aneurysm at the left PCoM. Endovascular treatment with a p64 HPC was planned. During deployment, incomplete opening of the flow diverter was observed in the mid-portion of the stent with good apposition in the distal and proximal part. Balloon angioplasty was attempted but achieved only partial correction and a distal migration of whole device with occlusion of ICA bifurcation and of the anterior cerebral artery (ACA). We attempted reposition or removing completely the device using a balloon, 2 different stentretrievers and Comaneci device. With Comaneci we were able to move down the p64 in a safe position. Aneurysm neck was covered and all the arteries remained opened. The patient remained neurologically at preoperative level, with subsequent improvement in her third cranial nerve palsy.Abstract C88 Figure 2Conclusions This case highlights a technical complication of flow diverter deployment, malfunction in stent opening. Using balloon angioplasty and a variety of devices and techniques allows us to open properly the device and prevent future complications.Abstract C88 Figure 3Conflict of Interest No