Dancing megasperm

Last revised by Ashesh Ishwarlal Ranchod on 27 Dec 2023

Dancing megasperm is the ultrasound finding of continuously oscillating/mobile tiny echogenic foci within dilated tubules of the epididymis. This is seen in post-vasectomy patients and others with obstruction of the spermatic cord and is thought to represent clumps/ clusters of trapped spermatozoa which oscillate due to the turbulence created during ultrasound interrogation of the scrotum 2,3.

Note: a single spermatozoon can only be identified microscopically 3.

Differential diagnosis

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Cases and figures

  • Case 1
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  • Case 2: with epididymal tubular ectasia
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