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Head and Neck Imaging

Hook shape sign, in acoustic schwannoma

hook-shaped extension into the cochlear fossa of an intracanalicular acoustic schwannoma, as visible on gadolinium-enhanced axial T1-weighted images (Fig.1). The presence of this sign in hearing patients with an intracanalicular acoustic schwannoma signifies a poor chance of preserving hearing after surgery.

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Fig.1

Axial gadolinium-enhanced T1-weighted image through left temporal bone. Intracanalicular acoustic schwannoma showing extension into the cochlear fossa (arrow) (courtesy by Frdrique Dubrulle, MD, Lille, France).
Hook shape sign, in acoustic schwannoma, Fig.1