passages.id: split_4_test_1885_passage
passages.type: progene_text
passages.text: To study the relationship between NF1 and intracranial aneurysms , we have analyzed all intracranial autopsies of NF1 patients performed at our institution from 1889 to 1999 and analyzed all intracranial aneurysm cases at our institution from 1990 to 1999 in an attempt to identify patients with NF1 .