A Case of Spontaneous Meningocele of the Frontal Sinus Causing Recurrent Cerebrospinal Fluid Rhinorrhea and Meningitis

Meningocele is a bulging of the meninges through a defect in the skull or spine, forming a cystic structure filled with cerebrospinal fluid (CSF) and devoid of neural tissues. If left untreated, meningocele with CSF leakage can lead to potentially life-threatening complications such as recurrent meningitis. We report a case of spontaneous meningocele in the frontal sinus treated with endoscopic excision and reconstruction of the skull base. A 44-year-old male, with no previous history of trauma, presented with recurrent watery rhinorrhea from the right nasal cavity. An magnetic resonance imaging (MRI), conducted during treatment for recurrent meningitis, revealed a protruding mass in the right frontal sinus. Exploratory endoscopic sinus surgery exposed a meningocele with cerebrospinal fluid leakage. The meningocele was successfully treated with no signs of recurrence.