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Hypospadias of some degree is one of the most common malformations of man. According to Rennes, Kaufman and others this deformity occurs in one of every 350 males.
There are several theories as to the cause of this condition. Some claim that from atresia of the urethra there is fetal retention of urine and finally a giving way of the urethra, or that the same result is caused by a delay in the development of the glandular urethra. The most probable is that of Reichel, who states that hypospadias is merely an arrest of development and the degree of deformity is an indication of the period of intrauterine life at which it occurred. Perineal openings develop in the sixth or seventh and glandular from the twelfth to the sixteenth week.
The more common variety is the glandular or balanic, in which the urethral opening is situated back of a broad,
MAYO CH. HYPOSPADIAS.. JAMA. 1901;XXXVI(17):1157–1162. doi:10.1001/jama.1901.52470170003001a