Tarlov cyst - large
Low back pain.
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Voluminous perineural cyst occupying the spinal canal from L5 to S3-S4 with diameters of 8 x 3 cm, with completely liquid content. Significant bony remodelling of the sacrum secondary to mass effect. The medullary cone and the cauda equina are normal.
A Tarlov cyst is a dilatation of the subarachnoid space surrounding a spinal nerve root. Most patients are asymptomatic with no demonstrable need for care.
Tarlov cysts are most frequently found at the S2 level, and bone remodelling is a common feature of large cysts.