title: Scrotal disorders: evaluation of testicular enhancement patterns at dynamic contrast-enhanced subtraction MR imaging.
abstract: OBJECTIVE
  To evaluate testicular enhancement patterns in various scrotal disorders at dynamic contrast medium-enhanced subtraction magnetic resonance (MR) imaging.
  
  
  METHODS
  Forty-two patients with scrotal symptoms (22 testicular diseases, 20 extratesticular scrotal disorders) underwent three-dimensional (3D) fast field-echo or fast spin-echo dynamic subtraction MR imaging after injection of paramagnetic contrast medium. The relative percentages of peak height and mean slope of the testes on the affected side were compared with those on the unaffected side by using time-signal intensity curves.
  
  
  RESULTS
  Extratesticular scrotal disorders (time-signal intensity curve mean peak height, 93.1%; mean slope, 89.8%) showed gradual and progressive increase in homogeneous testicular contrast enhancement in all normal testes. Relative percentages of peak height and mean slope of testicular torsion (mean peak height, 17.3%; mean slope, 10.6%), infarction (mean peak height, 30.4%; mean slope, 19.8%), traumatic hemorrhagic necrosis (mean peak height, -3.5%; mean slope, -12.0%), and epidermoid cyst (mean peak height, -6.6%; mean slope, -14.2%) were significantly lower than those of extratesticular scrotal disorders. Acute mumps orchitis (mean peak height, 135.1%; mean slope, 307.5%) and malignant testicular tumor (mean peak height, 178.7%; mean slope, 467.6%) showed higher relative percentages of peak height and mean slope.
  
  
  CONCLUSIONS
  Dynamic contrast-enhanced subtraction MR imaging can provide information about testicular perfusion on the basis of contrast enhancement and can be used to differentiate testicular diseases from scrotal disorders.
authors.affiliation: Depts of Radiology, and Urology, Kurashiki Central Hospital, 1-1-1 Miwa, Kurashiki, 710-8602, Japan. yw5904@kchnet.or.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Watanabe
authors.forename: M
authors.initials: M
authors.lastname: Dohke
authors.forename: K
authors.initials: K
authors.lastname: Ohkubo
authors.forename: T
authors.initials: T
authors.lastname: Ishimori
authors.forename: Y
authors.initials: Y
authors.lastname: Amoh
authors.forename: A
authors.initials: A
authors.lastname: Okumura
authors.forename: K
authors.initials: K
authors.lastname: Oda
authors.forename: T
authors.initials: T
authors.lastname: Hayashi
authors.forename: Y
authors.initials: Y
authors.lastname: Dodo
authors.forename: Y
authors.initials: Y
authors.lastname: Arai
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D003287:Contrast Media; D003937:Diagnosis, Differential; D019786:Gadolinium DTPA; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012611:Scrotum / Q000098:blood supply; D013382:Subtraction Technique; D013733:Testicular Diseases / Q000175:diagnosis*; D013737:Testis / Q000098:blood supply
chemical_list: D003287:Contrast Media; D019786:Gadolinium DTPA