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

Modality: MRI

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 tumour, such as a schwannoma.

Acquired on a 1.5T Toshiba Titan.

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Case Information

rID: 28453
Case created: 26th Mar 2014
Last edited: 26th Sep 2015
Tag: spine
Inclusion in quiz mode: Included

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