Primary MALT lymphoma of the eyelids is a rare disease;chronic infection by Chlamydophila psittaci has been identified as a possible causative agent, but other pathogens may be implicated such Hepatitis C virus and Helicobacter Pylori. This tumor is considered to have an indolent natural history and a favorable prognosis. Radiation therapy with moderate doses is the corner stone of treatment offering excellent local control with low complications rate. We report herein the radiation therapy treatment plan of a 65-year-old man presented to our department with a primary bilateral lower palpebral MALT lymphoma. CT scan of 2.5-mm slice thickness in supine position was realized. A bolus of 1cm adapted to closed eyes (glasses-like) were placed and fixed to palpebral surface (Figures 1,2), before immobilization with standard thermoplastic mask (Figure 3). The clinical target volume included the tumor, lachrymal glands and the entire orbit. The planning target volume was obtained by automatic margin of 5 mm around the clinical target volume. Optic nerves,eyeballs and lens were ontoured as organs at risk.
Published on: Jul 5, 2016 Pages: 21-22