Proposal for the delineation of postoperative primary clinical target volumes in ethmoid cancers

It is proposed to delineate the anatomo-clinical target volumes of primary tumor (CTV-P) in ethmoid cancers treated with post-operative radiotherapy. This concept is based on the use of radioanatomy and the natural history of cancer. It is supported by the repositioning of the planning scanner with preoperative imaging for the replacement of the initial GTV and the creation of margins around it extended to the microscopic risk zones according to the anatomical concept. This article does not discuss the indications of external radiotherapy but specifies the volumes to be delineated if radiotherapy is considered. (C) 2020 Published by Elsevier Masson SAS on behalf of Societe francaise de radiotherapie oncologique (SFRO).