title: Subarachnoid hemorrhage and negative angiography: clinical course and long-term follow-up.
abstract: The aim of this study was to investigate the long-term natural history of nontraumatic angiogram-negative subarachnoid hemorrhage with typical pretruncal (P-SAH) and diffuse (D-SAH) pattern of hemorrhage. A retrospective review of 102 patients who experienced angiographically negative SAH at our institution was undertaken (11.6% of 882 spontaneous SAH). Follow-ups were obtained at 7.9 to 16 years. In the D-SAH group, 11 patients (13.9%) out of 79 had an aneurysm, and four (5.1%) had rebleeding episodes. In the P-SAH group, the second angiography was negative in all of the 23 cases, and no rebleeding episodes were recorded. The long-term follow-up confirms that P-SAH is a benign disease. A second angiography could not be necessary. D-SAH is probably due to an aneurysm that thrombose early after the bleeding. At short-term follow-up, the sack could frequently recanalize and rebleed, whereas a late follow-up shows that rebleeding is very rare.
authors: Division of Neurosurgery, Department of Neuroscience, University of Torino, Via Cherasco 15, 10126, Torino, Italy. marco.fontanella@tin.it
authors: Marco
authors: M
authors: Fontanella
authors: Innocenzo
authors: I
authors: Rainero
authors: Pier Paolo
authors: PP
authors: Panciani
authors: Bawarjan
authors: B
authors: Schatlo
authors: Chiara
authors: C
authors: Benevello
authors: Diego
authors: D
authors: Garbossa
authors: Christian
authors: C
authors: Carlino
authors: Walter
authors: W
authors: Valfrè
authors: Federico
authors: F
authors: Griva
authors: Gianni Boris
authors: GB
authors: Bradac
authors: Alessandro
authors: A
authors: Ducati
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