1. Vincent Grégoire, Peter Levendag et. al. DELINEATION OF THE CTV IN THE N 0 NECK OF PATIENTS WITH HEAD & NECK SQUAMOUS CELL CARCINOMA. ANATOMICAL BOUNDARIES Compilation by Dr. Z. Bernstein Authorized for publication at the EORTC RTG Website by Prof. V. Grégoire Compilation by Dr. Z. Bernstein Authorized for publication at the EORTC RTG Website by Prof. V. Grégoire Copyright. EORTC Radiotherapy Group 2005

2. References: 1. Gregoire V, Levendag PC, Ang KK, et al. CT-based delineation of lymph node levels and related CTVs in the node negative neck: DAHANCA, EORTC, GORTEC, NCIC,RTOG consensus guidelines. Radiother Oncol 2003;69:227–236. 2. Gregoire V, Hamoir M, Levendag P. et al. CT-based delineation of lymph-node levels and related CTVs in the nodepositive and the postoperative neck [Abstract]. In J Radiat Oncol Biol Phys 2004;60(Suppl 1):S497–S498. 3. Levendag PC, Gregoire V, et al. Intraoperative validation of CT-based lymph nodal levels, sublevels IIA and IIB: is it of clinical relevance in selective radiaton therapy? Int. J. Radiation Oncology Biol. Phys., Vol. 62, No. 3, pp. 690–699, 2005 4. Gregoire V, Daisne JF, Geets X, Levendag P. Selection and delineation of target volumes in head and neck tumors: beyond ICRU definition. Rays. 2003 Jul-Sep;28(3):217-24. Review.

6. RETRO – PHARYNGEAL LYMPH NODES

12. LEVEL – I A

19. LEVEL – I B

25. LEVEL – II A

30. LEVEL – II B

36. LEVEL – III

43. LEVEL – IV

49. LEVEL – V

55. LEVEL – VI