Postoperative Symptomatic Cerebral Vasospasm: Requiring Attention Following an Uneventful Resection of an Epidermoid Cyst - A Case Report and Literature Review.

Cerebral vasospasm associated with epidermoid cyst can be caused by tumor content spillage, such as spontaneous rupture and postsurgical resection. Symptomatic cerebral vasospasm following the resection of an intracranial epidermoid cyst is a rare but serious complication that lacks a consensus on treatment. Case presentation: A 10-year-old girl underwent an uneventful complete resection of a left cerebellopontine angle epidermoid cyst. On the second postoperative day (POD 2), she exhibited reduced speech, confusion, and hyperventilation followed by hypocapnia. On POD 4, she developed right hemiparesis and dysphasia. Cerebral magnetic resonance imaging showed restricted diffusion areas in her left temporal and parietal lobes and the dorsal thalamus. Magnetic resonance angiograms confirmed narrowing of the proximal middle cerebral arteries, consistent with vasospasm. Conservative management, consisting of intravenous hydration and corticosteroid administration, proved effective in resolving her symptoms and radiologic vasospasm. On POD 8, the extensive restricted diffusion areas notably decreased in size. Her right hemiparesis was completely resolved, and her dysphasia gradually improved over time. At the 1-year follow-up, she exhibited moderate transcortical sensory dysphasia. To our knowledge, this study is the first to report on a pediatric case of symptomatic cerebral vasospasm following an epidermoid cyst resection. The combination of tumor content spillage and hyperventilation may contribute to the occurrence of cerebral vasospasm and subsequent ischemia. This complication should be acknowledged after a complete and uneventful resection.