Jugular bulb diverticula in medial petrous bone

Area of Science:

• Otolaryngology
• Neurosurgery
• Radiology

Background:

• The jugular bulb (JB) is a venous structure typically located inferior to the petrous bone.
• An upward extension or diverticulum of the JB is an uncommon anatomical variation.
• Such extensions most frequently protrude into the middle ear space.

Observation:

• This report details three cases of superior JB diverticulum.
• The diverticulum originated from the medial aspect of the JB.
• It resulted in a bony defect in the medial petrous bone, adjacent to the internal auditory canal.

Findings:

• The JB diverticulum directly abutted the posterior wall of the internal auditory canal.
• Radiographic imaging demonstrated characteristic features of this specific anatomical anomaly.
• These features were sufficient to distinguish it from other pathologies.

Implications:

• Accurate radiographic identification of JB diverticulum can prevent unnecessary diagnostic procedures and surgical exploration.
• Potential encroachment on the internal auditory canal by the diverticulum may be a contributing factor to neurosensory hearing deficits.
• Understanding this variation is crucial for accurate diagnosis and management of related symptoms.