Clinical question: Persistent posterior dizziness. Signs and symptoms: Dizziness. Pre and post enhanced brain MRI:Unremarkable diffusion-weighted series.There is normal anatomical development, morphology and signal intensity of brain parenchyma on all MRI sequences. Unremarkable cerebral cortex, cortical sulci, ventricular system, CSF spaces and brain myelination. The signal void of major intracranial arterial branches are identified.Post enhanced images demonstrate no abnormal enhancement of brain parenchyma or leptomeninges and no abnormal enhancement of calvarium, soft tissues of the scalp or the orbits. There is normal enhancement of the intracranial venous sinuses.Unremarkable images through the orbits.Paranasal sinuses demonstrate a large retention cyst in the right maxillary sinus measuring at least at 40 x 28 mm in transaxial dimensions and unremarkable otherwise. Bilateral mastoid air cells and middle ear cavities demonstrate normal pneumatization signal patterns.
1.No acute intracranial process and negative diffusion weighted series.2.Unremarkable anatomical morphology, signal intensity of brain parenchyma and without detectable abnormal enhancement.3.Unremarkable calvarium, soft tissues of the scalp, orbits and paranasal sinuses other than a large retention cyst in the right maxillary sinus.