ESTRO 2023 - Abstract Book

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ESTRO 2023

No toxicity at the six-month check-up

The estimated time to evaluate remission of the lesions post-radiotherapy is three and six months.

As acute toxicity he presented Dermitis GII and Mucositis GII in testicular pouch and penile body with gradual resolution thanks to local care by the nursing staff. The response to treatment has been satisfactory at the expense of checking the definitive result during the next year.

Tolerance has been good with excellent collaboration at all times.

The patient completed treatment in February 2022.

The duration of the treatment covers the period from 27/12/2021 to 01/02/2022 including 5 weekly sessions.

Conclusion Extramammary Paget's disease is a rare neoplasm with a favorable prognosis if diagnosed in early stages.

Plesiotherapy offers excellent locoregional control while preserving the function and esthetics of the affected organ.

This technique can reduce the air between lesion and applicator, improve precision and uniformity of the dose and offer greater protection to organs at risk.

PO-2190 Comparison of doses in the critical organs in oral cavity tumors, applying BT, VMAT and SRT

&. Ferenczi 1

1 National Institute of Oncology, Radiotherapy, Budapest, Hungary

Purpose or Objective To study the doses in the critical organs using different irradiation techniques - on the basis of a model experiment - in operated tongue and floor of mouth tumors. Materials and Methods Between March 2013 and August 2022 twenty patients (11 male/9 female) with stage T1-3N0M0 tongue (n=14) and floor of mouth (n=6) tumors received postoperative radiotherapy because of near/positive surgical margin and/or lymphovascular and/or perineural invasion using high-dose-rate (HDR) interstitial brachytherapy (BT) with a total dose of 15 x 3 Gy applying flexible plastic catheters. For the purpose of comparison volumetric modulated arc therapy (VMAT) and stereotactic irradiation (SRT) plans were also prepared in all cases, using the above mentioned fractionation and total dose. In terms of organs at risk, the doses of the mandible, the ipsilateral and the contralateral salivary glands were compared.