History: 55 year old male with incidental lump in his scrotum.
Ultrasound through the left testicle shows a well circumscribed isoechoic mass arising from the scrotum inferior to the left testicle.
Single coronal T2W MR image through the scrotum in the same patient reveals a markedly hypointense mass within the left scrotum, confirming the fibrous nature of this mass.
The imaging here is essentially diagnostic of scrotal fibrous pseudotumor, particularly, the marked hypointensity on T2W MR imaging. A scrotal fibrous pseudotumor typically arises from the tunica albuginea or vaginalis and can break free to form a “scrotal mouse.”
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