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L4
: or supraclavicular
L3
or infraclavicular: above pectoral muscles
L2
: posterior to pectoralis minor
L1
: caudally to pectoralis major
IM
Rotter
: between pectoralis major and minor
REGIONAL NODES
A lymph node is typically a 5 mm margin
around the veins
With the arm raised, L1 lymph
nodes may appear in the same CT
slice as L2 and L3