Etiology-Specific Mineralization Patterns in Patients with Labyrinthitis Ossificans.

Area of Science:

• Otolaryngology
• Radiology
• Pathology

Background:

• Labyrinthitis ossificans is a sequela of temporal bone trauma, infection, or disorders like sickle cell disease.
• Specific mineralization patterns in labyrinthitis ossificans related to risk factors have not been previously detailed.

Purpose of the Study:

• To identify associations between specific ossification patterns in labyrinthitis ossificans and known risk factors.
• To describe mineralization patterns in the membranous labyrinth in relation to clinical history.

Main Methods:

• Retrospective analysis of temporal bone CT scans (November 2005 - May 2018) in patients with labyrinthitis ossificans.
• Evaluation of ossification severity (0-4 score) in cochlear turns, semicircular canals, and vestibule.
• Correlation of ossification patterns with clinical risk factors using descriptive statistics and mixed models.

Main Results:

• Forty-four patients (58 ears) with labyrinthitis ossificans were analyzed.
• Chronic otomastoiditis, temporal bone surgery, trauma, sickle cell disease, and meningitis were common risk factors.
• Semicircular canals showed the most severe ossification, while the vestibule was least affected.
• Prior temporal bone surgery correlated with significantly greater mineralization in the cochlea, vestibule, and semicircular canals.

Conclusions:

• Significant mineralization patterns in labyrinthitis ossificans are associated with prior temporal bone surgery.
• Semicircular canals are consistently the most affected structures across all etiologies.
• No significant mineralization patterns were identified for chronic otomastoiditis, meningitis, sickle cell disease, or trauma.