Abstract
In 10 cases of supratentorial AVM, hemodynamic characteristics of the cerebral circulation in the nidus itself, adjacent brain tissue, and on the area distant from the nidus were evaluated with HEADTOME SET-031 SPECT. The following results were obtained:
1. In 5 cases of high flow type AVM with a maximal nidus diameter over 3.7 cm, the steal phenomenon was detected by SPECT using IMP and 133Xe.
2. The use of IMP for SPECT allowed the best visualization of the nidus, while the lesion observed with PAO-SPECT was narrower and poorly demarcated.
3.133Xe was not suitable for visualization of lesions, although it was useful in detecting steal phenomenon in the remote region if Diamox was administered for CO2 loading.
4. In one case of large AVM, excessive reaction to Diamox was observed, extending from the affected hemisphere to the opposite hemisphere. This reaction was improved by surgical embolization.
