Abstract:
:Case 1: A 14-year-old boy with nasopharyngeal cancer (T4N0M0) was treated with stereotactic radiosurgery (SRS) as a boost therapy after conventional radiotherapy. Persistent residual tumor visible with MR remained after conventional radiotherapy comprising 59.6 Gy in total. We therefore performed SRS to add a further irradiation dose while causing minimal damage to adjacent normal tissue. SRS was performed using multiple non-coplanar arcs delivered to the residual tumor, which was defined to add 2 mm margins to the residual tumor. This was 30 cc as defined by CT and MR images. Twenty Gy were administered to the periphery of the planning target volume (PTV), corresponding to the 80% isodose line. No recurrences or late complications have been observed 4 years and 6 months after the SRS. Case 2: A 27-year-old man with nasopharyngeal cancer (T1N0M0) was treated with SRS as a boost therapy following conventional radiotherapy with 55 Gy. The SRS was performed using multiple non-coplanar arcs delivered to the PTV, which was 10 cc as defined by CT and MR images as in case 1. Sixteen Gy were administered to the periphery of the residual tumor, corresponding to the 80% isodose line. The tumor was not visible on follow-up MR images and no complications have been observed 4 years and 2 months after the SRS.
journal_name
Jpn J Clin Oncoljournal_title
Japanese journal of clinical oncologyauthors
Yokouchi J,Satani K,Kanesaka N,Abe K,Hasegawa Tdoi
10.1093/jjco/hyh126keywords:
subject
Has Abstractpub_date
2004-11-01 00:00:00pages
692-5issue
11eissn
0368-2811issn
1465-3621pii
34/11/692journal_volume
34pub_type
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