Abstract
Chiari malformations (CM) are often diagnosed in childhood and younger adults, with an incidence of only 0.77% in adult populations. Patients with CM may develop syringomyelia and increased intracranial pressure (ICP) due to cerebrospinal fluid (CSF) obstruction and altered fluid dynamics at the cervicomedullary junction. We describe the case of a 65-year-old female presenting with an angionegative subarachnoid hemorrhage (SAH) with concomitant new diagnosis of CM type I with syringomyelia. After ruling out any aneurysm or vascular malformations, she underwent a suboccipital craniectomy for a Chiari decompression with a C1 laminectomy. There were no complications with the surgery and her symptoms improved. This case report highlights the unusual presentation of a CM.
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