This is an ultrasound image of a mass in a 45-year-old's testicle. It was published in the International Society of Urology's journal, Urology. Is it just another example of pareidolia or something far… more… sinister? From the article:
The residents and staff alike were amazed to see the outline of a man's face staring up out of the image, his mouth agape as if the face seen on the ultrasound scan itself was also experiencing severe epididymo-orchitis.