Accessory Muscle Slip Connecting Obturator Internus and Piriformis Splits Sciatic Nerve Roots

A sciatic nerve variant shows an accessory muscle slip from obturator internus to piriformis splitting L5/S1 and S2 nerve roots — not a classic Beaton and Anson type. Always compare with the normal contralateral side to avoid misdiagnosis.

• Highlights a non-classic anatomical variant of the sciatic nerve with an interconnecting muscle slip between the obturator internus and piriformis.
• Emphasizes the importance of comparing with the contralateral side during MRI interpretation to identify this rare but clinically relevant finding.
• Single-case educational video; not a systematic study.

Automated summary

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