CLINICAL IMAGAGINGAN ATLAS OF DIFFERENTIAL DAIGNOSISEISENBERG

1. 14Cerebellopontine Angle
Masses on Computed
Tomography

2. CLINICAL IMAGAGING
AN ATLAS OF DIFFERENTIAL DAIGNOSIS
EISENBERG
DR. Muhammad Bin Zulfiqar
PGR-FCPS III SIMS/SHL

3. • Fig SK 14-1 Acoustic neuroma. Contrast-
enhancing mass (arrow) in the right internal
auditory canal and cerebellopontine angle
cistern.1

4. • Fig SK 14-2 Neurofibromatosis. Bilateral acoustic
neuromas (A) in a young girl with progressive
bilateral sensorineural hearing loss.

5. • Fig SK 14-3 Intracanalicular acoustic neuroma. Air
injected into the subarachnoid space shows the
cerebellopontine angle cistern (open arrows) and
outlines the small tumor (arrowheads).

6. • Fig SK 14-4 Meningioma. Dense enhancing
lesion (arrows) that is more broadly based
along the petrous bone than a typical acoustic
neuroma.

7. • Fig SK 14-5 Epidermoid. Irregularly shaped,
low-density mass (curved arrows) in front of
the basilar artery (arrow) and brainstem on
(A) axial and (B) coronal images.1

8. • Fig SK 14-6 Metastasis to left flocculus. Contrast-
enhancing nodule (arrow) displaces the
brainstem. It is distinguished from an acoustic
neuroma by its location posterior and medial to
the porus acousticus.1

9. • Fig SK 14-7 Arachnoid cyst. Slightly irregular cystic
mass (arrow) of cerebrospinal fluid density that
displaces the brainstem and basilar artery to the
right.1

10. • Fig SK 14-8 Giant aneurysm with thrombus simulating
meningioma. (A) Axial and (B) coronal images show the
mass (arrow) with calcific rim and high density within it
displacing the pons and cerebellum. The aneurysm fails
to enhance as densely as the basilar artery (arrow).1

11. • Fig SK 14-9 Glomus jugulare tumor. Densely
enhancing mass (arrow) that has eroded the
osseous margins adjacent to the right jugular
foramen.1