Internal Carotid Artery Pseudoaneurysm After Transsphenoidal Pituitary Tumor Resection: A Case Report.

Here, we present a case report on internal carotid artery pseudoaneurysm (ICAP) which highlights a rare but potentially life-threatening complication of transsphenoidal pituitary surgery. A 32-year-old male underwent resection of a pituitary tumor and developed a large cerebrospinal fluid (CSF) leak during surgery, which was reconstructed with a fat graft and nasoseptal flap. Postoperatively, he was recovering well and discharged without complications; however, eight days after surgery he returned with massive epistaxis and hematemesis. This was initially managed with endoscopic exploration, nasal packing, and transfusion of blood products. Imaging revealed a pseudoaneurysm on the right internal carotid artery. The patient was started on aspirin and clopidogrel, and a flow diverter stent was placed without complications. Our case emphasizes the importance of prompt recognition and management of vascular injuries such as an internal carotid pseudoaneurysm after transsphenoidal pituitary surgery to prevent catastrophic outcomes.