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The numbers of the correct answers are given Features characteristically associated with haematocolpos in a 16-year-old girl

include 1, 2, 3, 6 (Abnormality of genital tract, Amenorrhoea, primary and secondary) It is associated with primary amenorrhoea in girls with normal secondary

sexual characteristics. It may arise because canalization of the fused Müllerian ducts fails to occur. Failure of fusion of the Müllerian ducts may result in double or bicornuate uteri. The uterus is derived from the paramesonephric duct, the mesonephric duct is unimportant in females and coexistent abnormalities are rare. There is no association with closed spina bifida. Other associations include reduplication of the metanephric duct.