An unusual abnormality of human spermatozoa.
A defect affecting 90% of the spermatozoa of an infertile man consisted of round heads and a loss of tails, probably caused by a developmental abnormality at the spermatid stage.
D000328:Adult; D006801:Humans; D007248:Infertility, Male / Q000473:pathology*; D008297:Male; D013094:Spermatozoa / Q000648:ultrastructure*; D013737:Testis / Q000473:pathology