Epididymal leiomyoma

Dr Henry Knipe and Dr Matt A. Morgan et al.

Epididymal leiomyomas (fibrous pseudotumors) are uncommon smooth muscle tumors that do not have malignant potential. Their imaging features are not specific and, if small, it may be a difficult prospective diagnosis on imaging. They are usually encountered in a differential for epididymal/paratesticular masses and are the second most common epididymal mass, after adenomatoid tumors.

  • slowly-growing nontender scrotal mass
  • more common at age 40 and older 
  • solid, well circumscribed usually hypoechoic mass centered in the epididymis
    • may also be cystic or calcified 3
  • 1-4 cm in size
  • homogeneous low signal intensity on T1- and T2-weighted images

Article information

rID: 78130
System: Urogenital
Synonyms or Alternate Spellings:
  • Epididymal fibrous pseudotumors
  • Epididymal fibrous pseudotumor
  • Epididymal fibroids
  • Epididymal fibroid
  • Epididymal leiomyomata
  • Epididymal leiomyomas

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