“…Transcranial sonography (TCS) is a neuroimaging technique used to obtain and evaluate images of the cerebral parenchyma in movement disorders through B‐mode and assess the blood flow velocities of the intracranial vessels through Doppler mode (Brisson et al., 2021; Monaco et al., 2018). This is an ultrasonographic technique used to detect abnormalities in the echogenicity of substantia nigra (SN), thalamus, lenticular nuclei, red nuclei, the continuation of the median raphe nucleus, and ventricular diameters and assesses vascular reactivity (Brisson et al., 2021; Monaco et al., 2018; Walter et al., 2008). The main limitation of TCS is the lack of bone window, which could vary between 5% and 44% of the population, according to Brisson, Santos et al (2021), depending on various factors, including, sex, age, and ethnicity.…”