Spermatogenesis maturation arrest (HP_0031038) can be described as follows. Maturation arrest (MA) is defined as germ cells that fail to complete maturation. Uniform MA is characterized by spermatogenic arrest at the same stage of spermatogenesis throughout the seminiferous tubules. MA is subcategorized into early MA, in which only spermatogonia or spermatocytes are found, and late MA, in which spermatids are detected without spermatozoa. Also known as: Meiotic maturation arrest of spermatogenesis.