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Int J Radiat Oncol Biol Phys. 2013 Feb 1;85(2):298-308. doi: 10.1016/j.ijrobp.2012.06.019. Epub 2012 Jul 24.

Scrotal irradiation in primary testicular lymphoma: review of the literature and in silico planning comparative study.

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1
Department of Radiation Oncology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands. c.l.brouwer@umcg.nl

Abstract

We examined adjuvant irradiation of the scrotum in primary testicular lymphoma (PTL) by means of a literature review in MEDLINE, a telephone survey among Dutch institutes, and an in silico planning comparative study on scrotal irradiation in PTL. We did not find any uniform adjuvant irradiation technique assuring a safe planning target volume (PTV) coverage in published reports, and the definition of the clinical target volume is unclear. Histopathologic studies of PTL show a high invasion rate of the tunica albuginea, the epididymis, and the spermatic cord. In retrospective studies, a prescribed dose of at least 30 Gy involving the scrotum is associated with best survival. The majority of Dutch institutes irradiate the whole scrotum without using a planning computed tomography scan, with a single electron beam and a total dose of 30 Gy. The in silico planning comparative study showed that all evaluated approaches met a D(95%) scrotal dose of at least 85% of the prescription dose, without exceeding the dose limits of critical organs. Photon irradiation with 2 oblique beams using wedges resulted in the best PTV coverage, with a mean value of 95% of the prescribed dose, with lowest maximum dose. Adjuvant photon or electron irradiation of the whole scrotum including the contralateral testicle with a minimum dose of 30 Gy is recommended in PTL. Computed tomography-based radiation therapy treatment planning with proper patient positioning and position verification guarantees optimal dose coverage.

PMID:
22836054
DOI:
10.1016/j.ijrobp.2012.06.019
[Indexed for MEDLINE]
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