Right-sided middle ear soft-tissue lesion near the cochlear promontory. This lesion enhanced on MRI (not shown) is consistent with a tympanic paraganglioma (previously known as glomus tympanicum), which is the most common tumor of the middle ear cavity. These tumors can be asymptomatic, produce conductive hearing loss through contact with the ossicles (as in this case), or result in pulsatile tinnitus. This mass was observed to be stable over many years without treatment.