3D-Flair sequence at 3T in cochlear otosclerosis

Area of Science:

• Radiology
• Otolaryngology
• Medical Imaging

Background:

• Otosclerosis is a condition causing abnormal bone growth in the ear, potentially leading to hearing loss.
• Assessing intra-cochlear changes in otosclerosis is crucial for treatment planning, especially for cochlear implantation.
• Standard MRI sequences have limitations in visualizing endolabyrinthine fluid alterations.

Purpose of the Study:

• To evaluate the efficacy of three-dimensional fluid-attenuated inversion recovery (3D-FLAIR) sequences with and without gadolinium (Gd) contrast in detecting signal changes in endolabyrinthine fluid.
• To assess the capability of 3D-FLAIR in identifying intra-cochlear damage in patients with otosclerosis.

Main Methods:

• A 3-T MRI scanner was used to acquire 3D-FLAIR sequences before and after Gd administration in 13 otosclerosis patients and 11 controls.
• The MRI signal intensity of the cochlear fluid was assessed visually and by calculating the signal intensity ratio (SIR) against the brainstem.
• Patients had clinical/audiological diagnosis of severe/profound hearing loss due to otosclerosis and were candidates for cochlear implantation.

Main Results:

• No signal abnormalities were observed on T1-weighted images with or without Gd in either group.
• 3D-FLAIR revealed bilateral cochlear hyperintensity with enhancement after Gd in eight patients, and without enhancement in one patient.
• No endolabyrinthine signal abnormalities were detected in the remaining patients or the control group.

Conclusions:

• The 3D-FLAIR sequence with or without Gd is effective in detecting blood-labyrinth barrier (BLB) breakdown and subsequent endolabyrinthine fluid alterations in otosclerosis.
• 3D-FLAIR +/- Gd is a valuable imaging tool for assessing intra-cochlear damage in patients with cochlear otosclerosis.
• This technique may be useful for monitoring disease progression and evaluating treatment response in otosclerosis.