S1 nerve root schwannoma
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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.