FIG 1. Axial unenhanced CT scan shows a well-circumscribed mass (M) in the tympanic cavity. Note the erosion of the cochlear promontory (arrow).FIG 2. Coronal unenhanced CT scan shows the mass confined to the tympanic cavity. Note the normal-sized tympanic segment of the facial nerve canal (arrow).FIG 3. A, Axial unenhanced T1-weighted image shows a tympanic mass (arrow) that is isointense to brain parenchyma (500/10/2 [TR/TE/excitations]); B, Axial contrast-enhanced T1-weighted image reveals intense, homogeneous enhancement of the mass (arrow) (500/10/2)