J Korean Neurosurg Soc.  2003 Jan;33(1):76-80.

A Case of Recurrent Expansile Cyst Formation after Gamma Knife Radiosurgery for a Cerebral Arteriovenous Malformation: Role of the Residual Nidus: Case Report

• Bok WK
• Min KS
• Lee MS
• Kwon Y

Abstract

The authors report a case of recurrent expansile cyst formation after gamma knife radiosurgery(GKRS) for a cerebral arteriovenous malformation where the residual nidus might play an important role. A 28-year-old male patient underwent gamma knife radiosurgery for a left parietal lobe arteriovenous malformation which had manifested with generalized tonic-clonic seizure in November 1992. In March 1999, 76 months after GKRS, the patient presented with headache, dysphasia and right hemiparesis and the computed tomography(CT) and magnetic resonance(MR) image revealed a huge cystic lesion with enhancing nodule at the anterior wall of the cyst. Cerebral angiography showed a small residual nidus. Aspiration and drainage of the cystic fluid via a burr hole was performed and the symptoms improved. One year later, in March 2000, the symptoms recurred, and CT and MR image revealed a new huge cystic lesion anterior to the enhancing nodule. Surgical removal of the residual nidus was performed, and there is no recurrence of the cyst for two years till now.

Keyword

Areteriovenous malformation; Gamma knife radiosurgery; Cyst; Residual nidus

MeSH Terms

Adult
Aphasia
Arteriovenous Malformations
Cerebral Angiography
Drainage
Headache
Humans
Intracranial Arteriovenous Malformations*
Male
Paresis
Parietal Lobe
Radiosurgery*
Recurrence
Seizures