title: Conventional and diffusion-weighted magnetic resonance imaging findings of benign fibromatous paratesticular tumor: a case report.
abstract: BACKGROUND
  The vast majority of paratesticular masses are benign. Magnetic resonance imaging of the scrotum may provide valuable information in the pre-operative work-up of scrotal masses, by allowing the precise localization of the lesion and helping in characterizing its nature. Diffusion-weighted magnetic resonance imaging is an evolving technique that can be used to improve tissue characterization, when interpreted with the findings of conventional magnetic resonance sequences. We present the case of an adenomatoid tumor of the tunica albuginea, with abundant fibrosis evaluated by magnetic resonance imaging of the scrotum, including both conventional and diffusion-weighted sequences. To the best of our knowledge, there are very few reports in the English literature regarding the magnetic resonance imaging features of this rare benign paratesticular tumor and no report on the diffusion-weighted magnetic resonance findings. We discuss the value of magnetic resonance imaging in the pre-operative diagnosis of benign fibromatous paratesticular tumors and differential diagnosis.
  
  
  METHODS
  A 45-year-old Caucasian man was referred to us with a palpable left scrotal mass. Magnetic resonance imaging of his scrotum revealed the presence of a multilobular left paratesticular mass, mainly detected with very low signal intensity on T2-weighted images and restricted diffusion on apparent diffusion coefficient maps. These findings were suggestive of a fibrous component, and were confirmed on histology following lesion excision.
  
  
  CONCLUSIONS
  Magnetic resonance imaging of the scrotum, by using both conventional and diffusion-weighted sequences, could have a potential role in the evaluation of scrotal masses.
authors.affiliation: Department of Clinical Radiology, University Hospital of Ioannina, Leoforos S Niarchou, 45500, Ioannina, Greece. a_tsili@yahoo.gr.
authors.forename: Athina C
authors.initials: AC
authors.lastname: Tsili
authors.forename: Maria I
authors.initials: MI
authors.lastname: Argyropoulou
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Giannakis
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Sofikitis
authors.forename: Konstantine
authors.initials: K
authors.lastname: Tsampoulas