654 / 1708
Initially involved mediastinal area
in PR
:
•
GTV
: lymph node remnant(s) or remaining mass alone
•
CTV
: encompassing
volume of the mediastinal mass
before
chemotherapy
according to post chemotherapy
topography
– length of lymph nodes
before
CHT
– Width of lymph nodes
after
CHT
– displaced normal structure not included
– not exceed lateral mediastinal borders
– vessels not included (whenever possible)
•
CTV-PTV margin
:
1cm isotopic margin
Involved node concept EORTC