Conformal three-dimensional photon radiotherapy for paranasal sinus tumors

Background: Tumors in the nasal cavity and paranasal sinus are difficult to treat with radiotherapy. Usually, in addition to a two- or three-field pho ton technique, an interorbital electron field is required. This may result, however, in severe over or underdosage, the latter being especially detrim ental when occurring in the main tumor bulk. Methods and results: We present a conformal three-dimensional treatment tec hnique that provides sufficient interorbital dose with photons only while s paring the eyes, optic nerves and chiasm, and may be considered for selecte d tumors in this region. (C) 2000 Elsevier Science Ireland Ltd. All rights reserved.