title: Supernumerary microtubules and prolongation of the middle piece in two infertile patients.
abstract: A new type of sperm abnormality was described in two patients. There was at the same time a high percentage of immotile spermatozoa, supernumerary microtubules organized in more or less complete axonemes, and prolongation of the middle piece, whose mitochondria retain their normal enzymatic activity.
mesh_terms: D000328:Adult; D006801:Humans; D007248:Infertility, Male / Q000473:pathology*; D008297:Male; D008854:Microscopy, Electron; D008870:Microtubules / Q000648:ultrastructure*; D013081:Sperm Motility; D013094:Spermatozoa / Q000648:ultrastructure*