Segmental neurofibromatosis type 1 complicated with multiple intracranial arteriovenous fistulas: A case study.

Neurofibromatosis type 1 (NF1) is a rare autosomal dominant disorder that primarily affects the skin and the nervous system. This condition is called segmental NF1 (also called neurofibromatosis type V) when clinical features are limited to one area of the body. Segmental NF1 is generally thought to result from somatic mosaicism due to a postzygotic mutation in the NF1 gene, thus a test for NF1 gene abnormalities in peripheral blood is usually negative. Here we report a 31-year-old male presenting with epileptic seizures, who had a history of neurofibromas confirmed by biopsy, but lacked a family history of neurofibromatosis. Multiple signs highly suggestive of NF1 and cerebrovascular abnormities were seen, including distended scalp vessels, gingival hyperplasia, cutaneous masses, skin nodules, and café-au-lait macules. Cerebral computed tomography angiography and venography revealed multiple intracranial arteriovenous fistula. However, NF1 genetic testing of peripheral blood failed to detect mutations, deletions or rearrangements in any of the coding exons or neighboring splice sites. A diagnosis of segmental NF1 was still warranted. To the best of our knowledge, this is the first case study of segmental NF1 complicated with multiple intracranial arteriovenous fistulas.