Unexplained Intraoperative Movement During a Complex Craniotomy for Recurrent Petrous Apex Cholesterol Granuloma: A...

Intraoperative patient movement under general anesthesia, even with multiple monitoring modalities and adequate anesthetic depth, is rare but can lead to serious complications. Such movements are particularly dangerous in neurosurgical procedures, where precision is crucial. Similar risks exist in ophthalmic, spinal, and cardiac surgeries, where patient immobilization is vital to prevent adverse outcomes. This report examines the case of a 37-year-old male diagnosed with recurrent cholesterol granuloma located at the petrous apex, which necessitated neurosurgical intervention. During the procedure, the patient was placed under deep general anesthesia, and multiple neuromonitoring techniques were used to track neural and motor activity. Despite maintaining stable hemodynamic parameters and unremarkable neuromonitoring results, the patient suddenly exhibited abrupt, forceful movements involving his head and upper arms. This unexpected event during a delicate neurosurgical procedure posed a significant challenge, prompting a deeper investigation into the possible underlying causes of the patient's sudden movements, which could include factors such as insufficient anesthetic depth, muscular or neural irritation, seizure activity, or mechanical factors related to surgical equipment or technique. This case highlights the critical role of comprehensive intraoperative monitoring in ensuring patient safety, particularly during complex neurosurgical procedures where precision is essential. The use of total intravenous anesthesia (TIVA), as was used in this case, presents unique challenges, as it requires a careful balance of maintaining adequate anesthetic depth without interfering with the neuromonitoring signals used during the procedure to ensure neural integrity.