Fig. 1

Magnetic resonance angiography on admission and follow-up. Magnetic resonance angiography of the head performed on day 1 (a, b) and day 6 (c, d) of admission. Axial (a, c) and sagittal (b, d) projections of the intracranial arteries by three-dimensional time of flight imaging. Note the decreased flow in the proximal anterior cerebral, middle cerebral, and posterior cerebral arteries bilaterally on day 1 (a, b) that significantly improves on day 6 (c, d), suggesting partial resolution of vasospasm. Internal carotid arteries were normal in both sets of images. ACA anterior cerebral artery, ICA internal carotid artery, MCA middle cerebral artery, PCA posterior cerebral artery