PMC4327397_01
Preoperative and postoperative findings by MRI and CT.. Notes: (A) Preoperative MRI scan showing the tumor located in the left part of the ventral medulla oblongata. (B) Postoperative day 1 CT scan showing no apparent ischemic infarct area. (C) Postoperative day 3 CT scan showing an ischemic infarction at the bilateral internal carotid arteries and the posterior cerebral artery. (D) Postoperative day 3 MRA showing stenosis in the siphon segment of the bilateral internal carotid arteries and distal segment of basilar artery, and the slender distal blood vessel. Cerebral artery showed a slender, segmental stricture. (E) Postoperative CT scan showing the progressively enlarged ischemic infarction area. (F) Postoperative CT scan showing decompressive craniectomy.. Abbreviations: CT, computed tomography; MRA, magnetic resonance angiography; MRI, magnetic resonance imaging.
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Magnetic resonance imaging (MRI) confirmed the lesion (size: 2.5x2.0x2.0 cm) in the left part of the ventral medulla oblongata (Figure 1A). CT showed an ischemic infarction at the bilateral internal carotid arteries and posterior cerebral artery (Figure 1C), which was not present on day 1 (Figure 1B). Magnetic resonance angiography (MRA) showed stenosis at the carotid siphon and distal basilar artery, which was segmental (Figure 1D). CT revealed that the infarction was located in the frontal, parietal, occipital, and temporal lobes (Figure 1E). Decompressive craniectomy was successfully performed in the frontal and temporal parts (Figure 1F).
Photomicrograph of the tumor specimen.. Note: Pathological examination was consistent with a schwannoma.
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Indeed, hematoxylin and eosin staining (Figure 2) identified the classic Antoni A and Antoni B regions.