Presentation
Recent CT finding. Query Tarlov cyst. Query schwannoma.
Patient Data
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.