Case Report

Chronic Encapsulated Expanding Thalamic Hematoma Associated with Obstructive Hydrocephalus following Radiosurgery for a Cerebral Arteriovenous Malformation: A Case Report and Literature Review

Figure 1

(a) Preoperative initial computed tomography (CT) 11 years after radiosurgery for an arteriovenous malformation in the left parietal lobe showing the cyst in the left thalamus. (b) Two years later, CT reveals that the size of the cyst is increased without hydrocephalus. (c) Four years later, CT reveals that the multilobular cyst is larger and accompanied by obstructive hydrocephalus. Preoperative magnetic resonance imaging (MRI) showing a cystic lesion in the left thalamus appearing isointense on T1-weighted imaging (d) and hyperintense on T2-weighted axial (e) and coronal (f) imaging as well as association with obstructive hydrocephalus. Note thickened cyst wall and septum in the middle of the cyst. Postoperative CT (g) and MRI (h) show shrinkage of the hematoma cavity and improvement of hydrocephalus. CT scan one year after surgery demonstrates neither recurrence of the hematoma nor progressive hydrocephalus (i).
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