PMC4898228_01
49-year-old woman with sensorineural hearing loss. Sagittal T1 image demonstrates a mass isointense to CSF in the prepontine cistern that extends into the suprasellar region. The mass posteriorly displaces the pons, anteriorly bows the pituitary stalk (white arrow), and superiorly displaces the optic chiasm.
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fig1
Repeat MRI with and without contrast showed no change in a 2.5 x 4.9 x 4.4-cm low-T1 and very-high-T2-signal-intensity mass (Figure 1, Figure 2) centered in the prepontine cistern. The mass superiorly displaced the optic chiasm and optic nerve, with anterior bowing of the pituitary stalk (Fig. 1), and lateral bowing of the trigeminal nerve, facial nerve, and vestibularcochlear nerves bilaterally (Fig. 3).
49-year-old woman with sensorineural hearing loss. Axial T2 image demonstrates a high-signal-intensity mass of CSF intensity in the prepontine cistern and CPA cisterns. There is mild flattening of the anterior pons due to the mass but no edema.
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fig2
Repeat MRI with and without contrast showed no change in a 2.5 x 4.9 x 4.4-cm low-T1 and very-high-T2-signal-intensity mass (Figure 1, Figure 2) centered in the prepontine cistern.
49-year-old woman with sensorineural hearing loss. Axial T1 fat-suppressed postcontrast image demonstrates no enhancement of the CSF-signal-intensity mass in the CPA.
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There was no postgadolinium enhancement (Fig. 4) or restricted diffusion (Fig. 5).