title: Ipsilateral irradiation for carcinomas of tonsillar region and soft palate based on computed tomographic simulation.
abstract: OBJECTIVE
  To reduce xerostomia in selected patients with carcinomas of the tonsillar region and soft palate.
  
  
  METHODS
  We evaluated the treatment results of 32 patients with tonsillar region and soft palate carcinoma treated by radical radiotherapy between May 1989 and December 1996. They have a unilateral tumor that did not cross midline and have no contralateral neck lymphnode metastasis and treated with an ipsilateral technique (an anterior oblique and a posterior oblique field). All patients were planned with computed tomographic (CT) simulation and given 65 Gy in 26 fractions in 6.5 weeks with or without 5-15 Gy boost irradiation. The median follow-up was 44 months (4-86 months).
  
  
  RESULTS
  Five-year overall, cause-specific survival, local control, and regional control rate was 64, 79, 74 and 81%. No failure at the contralateral neck occurred. Moderate or severe symptomatic xerostomia was seen in 3 (9%) patients and ostero-radionecrosis requiring surgery occurred in one (3.3%) of 32 patients.
  
  
  CONCLUSIONS
  It is suggested that the ipsilateral technique is indicated in patients who had an unilateral tonsillar region or soft palate carcinoma that did not cross midline and have no contralateral neck lymphnode metastasis.
authors.affiliation: Department of Radiology, School of Medicine, Hokkaido University, N-15, W-7, Kita-ku, Sapporo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kagei
authors.forename: H
authors.initials: H
authors.lastname: Shirato
authors.forename: T
authors.initials: T
authors.lastname: Nishioka
authors.forename: T
authors.initials: T
authors.lastname: Arimoto
authors.forename: S
authors.initials: S
authors.lastname: Hashimoto
authors.forename: M
authors.initials: M
authors.lastname: Kaneko
authors.forename: K
authors.initials: K
authors.lastname: Ohmori
authors.forename: A
authors.initials: A
authors.lastname: Honma
authors.forename: Y
authors.initials: Y
authors.lastname: Inuyama
authors.forename: K
authors.initials: K
authors.lastname: Miyasaka
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002294:Carcinoma, Squamous Cell / Q000000981:diagnostic imaging / Q000401:mortality / Q000532:radiotherapy*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010157:Palatal Neoplasms / Q000000981:diagnostic imaging / Q000401:mortality / Q000532:radiotherapy*; D011832:Radiation Injuries / Q000150:complications / Q000517:prevention & control; D011880:Radiotherapy Planning, Computer-Assisted; D012189:Retrospective Studies; D015996:Survival Rate; D014057:Tomography, X-Ray Computed; D014067:Tonsillar Neoplasms / Q000000981:diagnostic imaging / Q000401:mortality / Q000532:radiotherapy*; D016896:Treatment Outcome; D014987:Xerostomia / Q000209:etiology / Q000517:prevention & control