Resolution of tonsillar herniation and syringomyelia after supratentorial tumor resection: Case report and review of the literature

OBJECTIVE AND IMPORTANCE: The pathophysiological features of syringomyelia are not yet entirely understood. We present a case of a supratentorial mass causing tonsillar herniation and syringomyelia. CLINICAL PRESENTATION: A 51-year-old woman underwent magnetic resonance ima ging for evaluation of progressive headaches. A large parietooccipital mass was revealed. Herniation of the cerebellar tonsils and a cervical syrinx w ere also noted. INTERVENTION: A craniotomy was performed without incident. After tumor rese ction, the tonsils ascended and the syrinx resolved in a 1-year period. CONCLUSION: This case highlights the importance of tonsillar herniation in the pathogenesis of syringomyelia. "Acquired" Chiari malformations and syri ngomyelia attributable to supratentorial masses may be treated by mass rese ction alone, without the need for foramen magnum decompression.