CASE HISTORY / CLINIC:
Patient with recurring left-sided otorrhea as well as significant left-sided
hearing impairment/hearing loss.


FINDINGS:
Demonstration of a hyperdense mass lesion in the post-contrast
axial CT image through the petrous bone at soft tissue window (above). Mass lesion has eroded structures in the middle ear and partly inner ear structures. No pneumatization of the middle ear and petrous air cells as well as portions of the mastoid. The bony erosion in the middle and posterior cranial fossa as well as the invasion of the inner ear are even better demonstrated in the bony window (below).

DIAGNOSIS:
Eosinophilic granuloma

DIFFERENTIAL DIAGNOSIS:
Malignant otitis externa.
Malignant tumor.


Web resources:

1) Amersham Health