The temporal bone as route of infection in recurrent meningitis

Area of Science:

• Otolaryngology
• Neurology
• Genetics

Background:

• Recurrent meningitis poses a significant clinical challenge, particularly when the etiology is unclear.
• Cerebrospinal fluid (CSF) leaks are a known, albeit uncommon, cause of recurrent meningitis.
• Congenital anomalies of the inner ear can predispose individuals to CSF leakage.

Observation:

• A case of recurrent meningitis in a patient with a history of upper respiratory tract infections is presented.
• The meningitis episodes were temporally associated with upper respiratory infections.
• The patient exhibited deafness and an absence of acute labyrinthitis signs during infectious episodes.

Findings:

• The recurrent meningitis was attributed to a congenital idiopathic oval window CSF leak.
• An underlying inner ear dysplasia was identified as the causative factor.
• This dysplasia explained both the CSF leak and the attenuated inflammatory response in the inner ear.

Implications:

• Highlights the importance of considering congenital CSF leaks in cases of recurrent meningitis, especially with concurrent inner ear abnormalities.
• Suggests that inner ear dysplasia can alter the clinical presentation of meningitis, masking typical labyrinthitis symptoms.
• Underscores the need for thorough diagnostic evaluation, including imaging, to identify subtle CSF leaks in pediatric patients.