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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
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