Conjoined S1 and S2 nerve roots

Case contributed by Frank Gaillard
Diagnosis certain

Presentation

Incidental anatomical variant.

Patient Data

Age: 55 years
Gender: Female

The left S1 and S2 nerve root exit the theca in a single dural sheath which then splits into separate nerve sheaths in the subarticular recess. This accounts for the asymmetry. 

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