To report a rare case of gonadal agenesis with rudimentary paramesonephric ducts derivatives in a female with a 46,XX normal karyotype. Case study. National Institute of Health. An 18- year- old female with primary amenorrhea and lack of secondary sexual development. Clinical, gynecological, endocrine, and genetic evaluation. Laboratory studies conducted included measurement of pituitary, ovary, and thyroid hormones; analyses of G- banded chromosomes in peripheral blood and fibroblast cultures; search for genomic Y- chromosome DNA by fluorescence in situ hybridization and molecular biology techniques; X- ray, ultrasonography, echocardiographic and laparoscopic studies for the assessment of bone age, and genitourinary and other associated malformations. Clinical, hormonal, anatomical, and genetic characteristics of the patient. The studies performed confirmed a prepubertal female with hypergonadotrophic hypogonadism, bilateral gonadal agenesis, a rudimentary uterus and fallopian tubes, a normal vagina, kidney, and urinary tract structures, and a 46,XX normal karyotype. The search for centromeric Y- chromosome DNA and SRY and ZFY genes was negative. A primary deficiency confined to the gonadal blastema and the nearby coelomic epithelium is proposed as an alternative embryologic mechanism to explain the occurrence of this singular sexual developmental defect.
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