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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 22:1143-1148 (6 2001)
© 2001 American Society of Neuroradiology

ARTICLE

MR Imaging After Aneurysmal Subarachnoid Hemorrhage and Surgery: A Long-term Follow-up Study

Riku P. Kivisaari^a, Oili Salonen^a, Antti Servo^a, Taina Autti^a, Juha Hernesniemi^a and Juha Öhman^a

^a From the Departments of Neurosurgery (R.P.K., J.H., J.Ö.) and Diagnostic Radiology (O.S., A.S., T.A.), Helsinki University Central Hospital, Helsinki, Finland.

BACKGROUND AND PURPOSE: We assumed that patients with surgically treated aneurysmal subarachnoid hemorrhage (SAH) might have more lesions than those revealed by CT that could be visible on MR images.

METHODS: We conducted a retrospective study of a series of 147 patients with aneurysmal SAH who were treated surgically within 3 days of the onset of SAH. One hundred four patients (mean age, 48.8 years) underwent MR imaging studies 2.1 to 5.6 years (mean, 3.3 years) postoperatively.

RESULTS: Eighty-four (81%) patients presented a total of 152 areas of increased signal intensity on T2-weighted images, consistent with infarction; 48% of the patients had lesions in the frontal lobes. CT performed 3 months postoperatively revealed hypodense areas on the scans of only 57% of the patients and showed lesions in the frontal lobes of only 16% of the patients.

CONCLUSION: Patients who undergo early surgery for aneurysmal SAH have more lesions than are revealed by CT. The difference is remarkable, especially in the frontal lobes.

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