Master N had genital malformation at birth and had bilateral gonads in the labial fold. He was reared as a boy and corrective surgery was done at the age of 4 years and was reassessed at the age of 14 years. His testosterone/dihydrotestosterone (DHT) was 11.8 (reference range <=10). Molecular analysis of SRD5A2 gene indicated the presence of a novel heterozygous missense mutation of p.A52T in exon 1, which was also detected in mother. The father, sister and maternal grandfather were found to have normal SRD5A2 gene sequence. We also detected an intronic (1–2) homozygous T>C transition in patient, whereas both parents were found to have the same transition in heterozygous form. Although 5α-steroid reductase 2 deficiency is an autosomal-recessive disorder, in this case, it appears that there may be a dominant inheritance because only one identified mutation was present which was passed from mother to son.
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