TVD 2017

L4: CRANIAL: Cranial subclavian artery or caudal cricoid (RTOG) CAUDAL: 5 mm subclavian vein or caudal edge clavicle head (RTOG) ANT: SCM muscle POST: Scalene muscle LAT: Lateral edge of SCM or junction 1st rib-clavicle MEDIAL: Include: jugular vein. Exclude: common cartotid artery, thyroid QUICK GUIDE