7 years, Female, Chiari malformation. Cerebellar tonsils are low-lying measuring up to 7 mm below the foramen magnum, with the left cerebellar tonsil slightly lower than the left, where it extends to the level of the C1 posterior arch. CSF flow sequence demonstrates fairly mildly diminished biphasic CSF flow at the foramen magnum.There are a few tiny foci of T2/FLAIR hyperintensity in the bilateral frontal and right parietal lobes which are nonspecific. There is otherwise no significant parenchymal signal abnormality. No restricted diffusion to suggest acute ischemia. No intracranial hemorrhage. No intracranial mass or mass-effect. The ventricles are within normal limits in size and configuration. Sella and orbits are grossly within normal limits. There is patchy opacification involving the bilateral anterior ethmoid air cells and mild to moderate right and mild left maxillary sinus mucosal thickening. There is also minimal mucosal thickening in the right frontal sinus. Partial opacification of the left-sided mastoid air cells also noted. Calvarium and remainder of the extracranial soft tissues are grossly unremarkable.
1. Findings compatible with a mild Chiari I malformation with very mildly diminished biphasic CSF flow at the foramen magnum.2. Remainder of the brain parenchyma is essentially unremarkable. There are minimal foci of T2/FLAIR hyperintensity in the supratentorial white matter which are nonspecific. 3. Mild paranasal sinus disease, with relatively greater involvement of the right anterior ethmoid and maxillary sinuses. There is also mild opacification of the left mastoid air cells.4. No prior studies are available for comparison and addendum can be issued if made available.