Signs in Acoustic Neuroma | Hitzelberger Sign & Ice Cream Cone Sign
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Signs in Acoustic Neuroma
Acoustic neuroma, also known as Vestibular Schwannoma, is a tumor arising from the Schwann cells of the vestibular nerve.
Two classical signs are associated with this tumor. In this post, we will discuss:
- Hitzelberger Sign
- Ice Cream Cone Sign
Hitzelberger Sign
📌 Type of Sign
👉 Clinical Sign seen during Sensory examination of the ear canal.
🔍 What is the Sign?
Hitzelberger Sign refers to Hypoesthesia (reduced sensation) of the posterior wall of the external auditory canal.
Seen in Acoustic Neuroma.
⭐ It is a very early clinical sign of acoustic neuroma.
🩺 How is it Elicited?
The examiner gently touches the posterior canal wall with a probe or cotton wisp.
Sensation is compared on both sides.
🧠 Why Does it Occur?
The posterior wall of the external auditory canal is supplied by the sensory fibers of the Facial nerve.
In acoustic neuroma, the tumor compresses the sensory fibers of Facial nerve very early.
This leads to Reduced sensation over the posterior canal wall.
What is the other name of the Sensory branch of the facial nerve?
What is the nerve supply of the external auditory canal?
👨⚕️ Eponym
Named after Hitzelberger, who described posterior external auditory canal sensory loss as a very early sign of facial nerve involvement in acoustic neuroma.
⚠️ Important MCQ Trap
✅ Acoustic neuroma is a tumor of the 8th cranial nerve
❌ It is not a tumor of the 7th cranial nerve
Hitzelberger Sign occurs because the tumor compresses the sensory fibers of the 7th nerve.
What is the most common presentation of acoustic neuroma?
What is the Gold standard investigation for acoustic neuroma?
Ice Cream Cone Sign
📌 Type of Sign
👉 Radiological Sign seen on MRI.
🔍 What is the Sign?
Ice Cream Cone Sign refers to the characteristic appearance of acoustic neuroma on MRI, when the tumor has grown to involve the cerebellopontine angle.
| Part | Portion of Tumor |
|---|---|
| Scoop | Tumor in the cerebellopontine angle |
| Cone | Tumor in the internal auditory meatus |
🧠 Why Does it Occur?
Acoustic neuroma arises from the Schwann cells of the vestibular nerve and grows:
Internal auditory meatus → Cerebellopontine angle
This pattern of growth gives the Typical ice cream cone appearance.
🍦 Why is it Called Ice Cream Cone Sign?
The tumor on MRI resembles an ice cream cone, hence the name Ice Cream Cone Sign.
What is the syndrome associated with acoustic neuroma?
⭐ High Yield Rapid Revision Table
| Sign | Type | Finding | Seen In |
|---|---|---|---|
| Hitzelberger Sign | Clinical | Hypoesthesia of posterior wall of external auditory canal | Acoustic Neuroma |
| Ice Cream Cone Sign | Radiological | Tumor in CP angle (scoop) and internal auditory meatus (cone) on MRI | Acoustic Neuroma |
🧠 Viva Pearls
- Acoustic neuroma is also known as vestibular schwannoma.
- Acoustic neuroma arises from the Schwann cells of the vestibular nerve.
- Hitzelberger Sign is hypoesthesia of the posterior wall of the external auditory canal.
- Hitzelberger Sign is a very early clinical sign of acoustic neuroma.
- Acoustic neuroma is a tumor of the 8th cranial nerve, not the 7th.
- Ice Cream Cone Sign is the characteristic MRI appearance of acoustic neuroma.
- In the Ice Cream Cone Sign, the scoop is the CP angle portion and the cone is the internal auditory meatus portion.
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