What is mastoid effusion on mri?

Mastoid effusion is the accumulation of fluid within the mastoid air cells, which are small cavities located behind the ear, usually as a result of inflammation or infection.

On MRI, mastoid effusion typically appears as areas of increased signal intensity on T2-weighted images, indicating the presence of fluid. The effusion may also demonstrate enhancement on post-contrast T1-weighted images, which can help differentiate it from other causes of mastoid opacity.

In cases where mastoid effusion is associated with an underlying infection, other MRI findings may include inflammatory changes in the adjacent soft tissues, such as thickening of the mastoid mucosa and enhancement of the bone marrow.

Mastoid effusion on MRI can be seen in various conditions, including acute otitis media, mastoiditis, cholesteatoma, or as a complication of previous ear surgery. It is important for radiologists and clinicians to consider the clinical history and symptoms when interpreting MRI findings to accurately diagnose and manage the underlying condition.