Mastoids and middle ears: Heterogeneous T1 and T2 hyperintense material is present within the left mastoid air cells and petrous apex. The remaining mastoid air cells are clear. There is evidence of diffusion restriction within the left mastoid without extension into the adjacent scalp soft tissues.
Parenchyma: No acute hemorrhage, infarction, or mass.
Additional comment: The venous sinuses are patent. The carotid artery flow voids are present.
1. Heterogeneous material within the left mastoid air cells with restricted diffusion but no extension into the adjacent scalp soft tissues.
2. Abnormal enhancement along the left tentorium extending to the left cavernous sinus and along the left sigmoid and transverse sinuses. The dural venous sinuses are patent. These findings are most compatible with an infectious/inflammatory process with intracranial extension to involve the cavernous sinus.