title: Radiotherapy on hidradenocarcinoma.
abstract: BACKGROUND
  Clear cell Hidradenocarcinoma is a rare carcinoma arising from sweat glands. It is an aggressive tumor that most metastasizes to regional lymph nodes and distant viscera; surgery with safe margins is the mainstay of treatment.
  
  
  METHODS
  We report a case of 68-year-old woman who presented with an invasive clear cell hidradenocarcinoma situated in the left parotid area which recurred 5 months after surgery, this recurrence was managed successfully by high-dose irradiation of the tumor bed (66 Gy) and regional lymphatic chains (50 Gy), after a follow-up of more than 15 months, the patient is in good local control without significant toxicity.
  
  
  CONCLUSIONS
  POST OPERATIVE RADIOTHERAPY ALLOWS BETTER LOCAL CONTROL AND SHOULD BE MANDATORY WHEN HISTOLOGICAL FEATURES PREDICTIVE OF RECURRENCE ARE PRESENT: positive margins, histology poorly differentiated, perineural invasion, vascular and lymphatic invasion, lymph node involvement, and extracapsular spread.
authors.affiliation: Department of Radiotherapy, Military Hospital Mohamed V, Rabat, Morocco.
authors.forename: Issam
authors.initials: I
authors.lastname: Lalya
authors.forename: Khalid
authors.initials: K
authors.lastname: Hadadi
authors.forename: El Mehdi
authors.initials: el M
authors.lastname: Tazi
authors.forename: Ilham
authors.initials: I
authors.lastname: Lalya
authors.forename: Amine
authors.initials: A
authors.lastname: Bazine
authors.forename: Khalid
authors.initials: K
authors.lastname: Andaloussy
authors.forename: Mohamed
authors.initials: M
authors.lastname: Elmarjany
authors.forename: Hassan
authors.initials: H
authors.lastname: Sifat
authors.forename: Khalid
authors.initials: K
authors.lastname: Hassouni
authors.forename: Tayeb
authors.initials: T
authors.lastname: Kebdani
authors.forename: Hamid
authors.initials: H
authors.lastname: Mansouri
authors.forename: Noureddine
authors.initials: N
authors.lastname: Benjaafar
authors.forename: Brahim Khalil
authors.initials: BK
authors.lastname: Elgueddari