Together they form the characteristic Ice Cream Cone Sign.
🦠 Seen In
Vestibular Schwannoma (Also called Acoustic Neuroma)
🧠 Why Does it Occur?
Vestibular Schwannoma arises from Schwann Cells of the Vestibular Nerve.
The tumor originates within the Internal Auditory Canal.
As it enlarges, it extends outward into the Cerebellopontine Angle.
This produces Narrow intracanalicular component (cone) & Expanded CPA component (scoop), creating the Ice Cream Cone appearance.
🍦 Why is it Called Ice Cream Cone Sign?
The tumor resembles:
A scoop of ice cream in the CPA
Sitting on a cone within the Internal Auditory Canal
Hence the name Ice Cream Cone Sign.
WHhatis the best investigation for Acoustic Neuroma?
What is the most Common Presenting Symptom for Acoustic Neuroma?
What is the nerve of Origin of Acoustic Neuroma?
Which Syndrome is associated with Acoustic Neuroma?
What is the characteristic finding seen in NF-2?
⭐ High Yield Rapid Revision Table
Ice Cream Cone Sign
Type
Components
Seen In
Normal Ice Cream Cone Sign
Radiological
Head of malleus + Body of incus
Normal CT Temporal Bone
Pathological Ice Cream Cone Sign
Radiological
CPA component + IAC component
Vestibular Schwannoma
⚡ Normal vs Pathological Ice Cream Cone Sign
Feature
Normal Ice Cream Cone Sign
Acoustic Neuroma Ice Cream Cone Sign
Imaging
CT Temporal Bone
MRI Brain/IAC
Structure Forming Scoop
Head of Malleus
CPA Tumor Component
Structure Forming Cone
Body of Incus
IAC Tumor Component
Significance
Normal Anatomy
Vestibular Schwannoma
Clinical Importance
Assesses ossicular integrity
Diagnoses CPA tumor
🧠 Viva Pearls
Ice Cream Cone Sign has both normal and pathological meanings in ENT.
Normal Ice Cream Cone Sign is formed by the head of malleus and body of incus, seen on axial CT temporal bone at the level of the epitympanum.
Loss of normal Ice Cream Cone Sign suggests incudomalleolar disarticulation.
Vestibular Schwannoma produces a pathological Ice Cream Cone Sign on MRI.
Best investigation for Acoustic Neuroma is MRI with gadolinium contrast.
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