Intracytoplasmic sperm injection outcomes in Chinese men with multiple morphological abnormalities of sperm flagella

Asthenozoospermia is a common cause of decreased male fertility, and several factors can inhibit or prevent sperm motility, including ultrastructural defects of the sperm flagellum） An ultrastructural defect leading to severe asthenozoospermia is a syndrome called dysplasia of the fibrous sheath （DFS）.