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Malignant external otitis with optic neuritis
Abstract:
Malignant external otitis (MEO) is a progressive necrotizing infection which spreads to the skull base. The causative organism is usually Pseudomonas aeruginosa and 90% of the patients are diabetic. The infection gains access to the skull base at the temporal bone. Cranial nerve involvement is common. We present a case of malignant external otitis causing blindness due to optic neuritis. Progressive vascular involvement along the skull base is the pathogenic mechanism that best explains spread from the temporal bone to the orbital apex.
Insights
Malignant external otitis, a severe Pseudomonas aeruginosa infection, can spread to the skull base, particularly in diabetic patients. This case highlights blindness caused by optic neuritis, emphasizing vascular spread to the orbital apex.
Area of Science:
- Infectious Diseases
- Ophthalmology
- Otolaryngology
Background:
- Malignant external otitis (MEO) is a serious necrotizing infection originating in the external ear canal.
- Pseudomonas aeruginosa is the typical causative agent, frequently seen in diabetic individuals (90% of cases).
- The infection can invade the skull base via the temporal bone, leading to cranial nerve palsies.
Observation:
- A rare case of MEO presenting with blindness due to optic neuritis is described.
- The patient experienced vision loss attributed to the infection's progression.
Findings:
- Optic neuritis developed as a complication of malignant external otitis.
- Progressive vascular involvement along the skull base is proposed as the pathogenic mechanism for spread to the orbital apex.
- This pathway explains the extension of infection from the temporal bone to the optic nerve.
Implications:
- This case underscores the potential for severe neurological and ophthalmological complications in malignant external otitis.
- Understanding the vascular spread mechanism is crucial for early diagnosis and management of MEO.
- Highlights the importance of aggressive treatment to prevent vision loss and other cranial nerve deficits.