S1 nerve root mass: probable schwannoma

Case contributed by Marina Goymer


Recent CT finding. Query Tarlov cyst. Query schwannoma.

Patient Data

Age: 77
Gender: Female

S1 nerve root schwannoma

There is an ovoid lesion associated with the left S1 nerve root as it exits the neural foramen in the left posterior pelvis.  It measures 4.3cm X 3.2cm X 3.7cm.  

It is hypointense on T1-weighted sequences, and heterogenously hyperintense on T2-weighted sequences.  It demonstrates heterogenous enhancement with a central cystic area following administration of contrast.  There is a tail of enhancing tissue at the lesion's proximal end which extends along the S1 nerve in the foramen.  

The findings are compatible with a nerve sheath tumor, such as a schwannoma.

Acquired on a 1.5T Toshiba Titan.

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Case information

rID: 28453
Published: 26th Mar 2014
Last edited: 2nd May 2017
Tag: spine
Inclusion in quiz mode: Included

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