KEY POINTS
- Granulomatosis with polyangiitis (GPA) and eosinophilic granulomatosis
with polyangiitis (EGPA) frequently affect the ear, resulting in the
development of external otitis, otitis media, sensorineural hearing
loss, and facial paresis.
- The lack of specific methods fordetectingvasculitis of the ear
occasionally hinders the early diagnosis of otologic involvementof GPA
and EGPA.
- Contrast-enhanced, 3D T1-weighted magnetic resonance imaging with
gradient-echo sequences (CE-3D-GRE) demonstrate intense enhancement in
the tympanic and mastoid segments of the Fallopian canalin spite of
the absence of facial paresis.
- Maximum intensity projection imagesclearly display an enhanced
Fallopian canal,which was associated with adjacent inflammatory
lesions.
- Intense enhancement of the Fallopian canal on CE-3D-GRE can be used as
a surrogate marker of otologic involvement of GPA and EGPA, which may
enable early diagnosis, monitoring, and therapy optimisation in a less
invasive manner.