Sylvian fissure arteriovenous malformations: An application of the Sugita classification to 28 surgical patients
OBJECTIVE: The Sugita classification for sylvian fissure arteriovenous malformations (AVMs) categorizes them into four types based on nidus location in the fissure: pure, lateral, medial, and deep. This classification scheme is simple and appealing, but is rarely applied. We applied the Sugita classification to a consecutive, single-surgeon experience with 28 patients to better characterize the Sugita subtypes. METHODS: Twenty-eight patients with sylvian fissure AVMs were identified from a series of 314 AVM patients treated microsurgically over a 9-year period. According to the Sugita classification, six (21%) AVMs were pure, four (14%) were lateral, nine (32%) were medial, and nine (32%) were deep. Fifteen (54%) patients presented with hemorrhage. RESULTS: There was no surgical mortality in this experience. Four (14%) patients had transient deterioration and one (3.6%) patient with a pure sylvian AVM was permanently worse. At late follow-up (mean duration, 20 mo), good outcomes (Modified Rankin Scale scores 0-2) were observed in 25 (89%) patients. CONCLUSION: The Sugita classification does not modify the surgical approach or predict patient outcomes with sylvian fissure AVMs, but it does clarify anatomic differences between subtypes. These AVMs are a diverse group, with each subtype having unique relationships between arteries, veins, nidus, and adjacent brain that influence microsurgical technique. Despite their eloquent location and technical challenges, results with microsurgical resection are excellent, making this the preferred treatment option for low-grade AVMs. Copyright © by the Congress of Neurological Surgeons.
Digital Object Identifier (DOI)
Lawton, Michael T.; Lu, Daniel C.; and Young, William L., "Sylvian fissure arteriovenous malformations: An application of the Sugita classification to 28 surgical patients" (2007). Neurosurgery. 948.