Article Figures & Data
Figures
- Fig 1.
Radiation therapy-induced cyst 89 months after AVM treatment.
A, T2-weighted axial image shows a 3-cm cyst in the frontoparietal region with vasogenic edema (arrow).
B, Contrast-enhanced T1-weighted axial image shows nodular contrast enhancement superficial to the cyst (arrow).
C, Postoperative CT showed successful cyst decompression (arrow) after cystoperitoneal shunt placement.
- Fig 2.
MR image obtained 40 months after AVM ablation.
A, T2-weighted axial image showed a 5-cm complex, multiloculated cyst in the left frontoparietal region with vasogenic edema and local mass effect (arrow).
B, Contrast-enhanced T1-weighted axial image shows nodular parenchymal enhancement (arrow).
C, CT after successful cystoperitoneal shunt placement shows decompression of the cysts.
- Fig 3.
MR image obtained 34 months after AVM ablation.
A, T2-weighted axial image shows multiple complex cysts in the posterior right temporal, occipital, and parietal region with vasogenic edema and mass effect.
B, Contrast-enhanced T1-weighted axial image shows nodular parenchymal enhancement.
C and D, MR images obtained after successful cystoperitoneal placement. Vasogenic edema and enhancement persist, but the patient remains asymptomatic after 4 years.
- Fig 4.
MR image obtained 59 months after AVM ablation.
A, T2-weighted axial image demonstrates multilocular cyst with surrounding vasogenic edema (arrow).
B, Contrast-enhanced T1-weighted axial image shows nodular parenchymal enhancement (arrow).
C and D, MR after cystectomy show postoperative encephalomalacia, resolution of cysts and minimal residual parenchymal enhancement (arrow).
- Fig 5.
MR image obtained 36 months after AVM ablation.
A, Contrast-enhanced axial T1-weighted image shows a peripherally enhancing, multiloculated cyst in the left parietal lobe.
B and C, T2-weighted and post-contrast T1-weighted images obtained after cystoperitoneal shunting show residual cyst and enhancement (arrows).
Tables
Summary of patient demographics and clinical history
Case Age at Gamm a Tx Sex Rx isodose vol (cc), margin/max dose (Gy) Tx to cyst Dx (months) Size at Dx (cc) Sx Tx AVM location 1 33 F 28.7, 16/20 89 14.0 HA, L arm weakness. Aspiration; CP shunt. R parietal 2 23 F 13.4, 16/32 66 1.0 (40 at 106 months) None. HA, mild aphasia, transient R arm paresthesia at 106 months. Aspiration; CP shunt. L parietal 3 20 F 13.5, 28/22.5 34 11.9 HA. Aspiration; CP shunt. R temporal 4 56 F 8.0, 16/32 4.9, 18/36 59 4.0 Repeat Tx at 44 months. HA, ataxia. Aspiration; CP shunt; cystectomy. R temporal 5 24 M 11.1, 18/36 16.5, 16/32 37 3.5 (63 at 50 months) Repeat Tx at 38 months. None. HA at 50 months. CP shunt; cystectomy. L parietal
