Benign Intracranial Hypertension (Otitic Hydrocephalus)

🧠 Benign Intracranial Hypertension (Otitic Hydrocephalus)

Benign intracranial hypertension, also known as otitic hydrocephalus, is a rare but important intracranial complication of otitis media, particularly relevant in ENT practice and examinations.

It is most commonly seen as a complication of acute otitis media (AOM) and chronic suppurative otitis media (CSOM), especially in children and adolescents.

📌 Definition of Benign Intracranial Hypertension

Benign intracranial hypertension is a condition characterized by Raised intracranial pressure (ICP) and Normal cerebrospinal fluid (CSF) composition.

• It is a rare intracranial complication of CSOM

• Can lead to optic atrophy and permanent blindness if untreated

• Often associated with sigmoid sinus thrombosis

Pathophysiology of Benign Intracranial Hypertension

Following a middle ear infection (acute or chronic), the disease progresses as follows:

Step 1: Sigmoid Sinus Thrombosis

Step 2: Two Mechanisms Leading to Raised Intracranial Pressure

What are the two mechanisms leading to benign intracranial hypertension?

Clinical Features of Benign Intracranial Hypertension

All symptoms are due to raised intracranial pressure.

1. Severe headache

   • Most common presenting complaint
   • Often associated with nausea and vomiting

2. Diplopia on lateral gaze

What is the cause behind Diplopia on lateral gaze in Benign Intracranial Hypertension?

1. Blurring of vision

   • Caused by papilledema
   • May progress to optic atrophy

   Papilledema features:

   • Usually 5–6 diopters
   • May show exudates and hemorrhages

2. Nystagmus

⚠️ Fundoscopic examination is mandatory to assess papilledema.

Investigations of Benign Intracranial Hypertension

1️⃣ Lumbar Puncture (With Caution)

• Must be done carefully to avoid cerebellar tonsillar herniation

What is the CSF Pressure seen in Benign Intracranial Hypertension?

🚩Normal CSF pressure ➡️ 70–120 mm H₂O

What are the Cerebrospinal Fluid (CSF) findings seen in Otitic Hydrocephalus?

2️⃣ MRI Brain with Venous Study

• Helps evaluate:

  • Venous sinuses
  • Presence and extent of sinus thrombosis

Treatment of Benign Intracranial Hypertension

Management is divided into medical and surgical components.

A. Medical Management

1️⃣ Reduce Intracranial Pressure

Drugs used:

• Corticosteroids
• Mannitol
• Acetazolamide
• Diuretics

2️⃣ Treat the Primary Cause

• Intravenous antibiotics to treat middle ear infection

B. Surgical Management

What are the indications for surgery in Otitic Hydrocephalus?

Surgical Options

1. CSF Diversion

   • Repeated lumbar punctures
   • Lumbar drain placement
   • Lumboperitoneal shunt (CSF drained into peritoneal cavity)

2. Mastoidectomy

   • Treats the middle ear disease
   • Helps address associated sinus thrombosis

3. Optic Nerve Sheath Decompression

   • Prevents optic atrophy
   • Preserves vision in severe cases

📌 Exam Pearls

• Benign intracranial hypertension = raised ICP + normal CSF
• Also known as otitic hydrocephalus
• Commonly associated with sigmoid sinus thrombosis
• Severe headache is the most common symptom
• CSF pressure >300 mm H₂O
• Early treatment prevents blindness

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