TRANSCRANIAL POWER-MODE DUPLEX ULTRASOUND IN 2 PATIENTS WITH MOYAMOYASYNDROME

Moyamoya syndrome is characterized by the reticulated collateralizatio n of the intracranial vasculature distal to an occlusion of proximal i ntracranial vessels. In the present study this pathology was visualize d in 2 patients, aged 29 and 32 years, using transcranial color Dopple r imaging (TCDI). Digital subtraction angiography in both patients rev ealed stenosis of the intracranial portion of the internal carotid art eries, occlusion and stenosis of several cerebral arteries, and a bila teral reticulated collateral network particularly in the region of bot h basal ganglia, typical of moyamoya syndrome. TCDI with power-mode Do ppler depicted parts of the intracranial collateral network, not possi ble using conventional color-flow Doppler. TCDI with power mode Dopple r permitted better visualization of intracranial vascular pathology in comparison to conventional color-flow Doppler, enabling a rapid and n oninvasive diagnosis of rare cerebrovascular anomalies.