Abstract
Cranial ultrasonography has been the most used imaging method for studying the neonatal brain. Traditionally, anterior (AF) and posterior (PF) fontanelles acoustic windows are employed to approach the supratentorial compartment. However, they have a poor accuracy in demonstrating posterior fossa abnormalities and do not allow studying the whole ventricular system, because of the increased distance between the transducer and these anatomical structures. This pictorial review aims to demonstrate the utility of mastoid fontanelle (MF) in evaluating the normal anatomy of midbrain and posterior fossa and in the diagnosis of some diseases occurring in these sites.
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