MRKH Syndrome: Diagnosis Elucidation

The case presents a 16-year-old female experiencing primary amenorrhea. Key clinical findings include the absence of a vagina, cervix, and uterus, despite the presence of normal secondary sexual characteristics and functional ovaries confirmed via ultrasound (USG).

Evaluating Diagnostic Options

Let's analyze the differential diagnoses based on the patient's presentation:

• Klinefelter's syndrome: This condition affects genetically male individuals (typically 47,XXY karyotype) and is characterized by hypogonadism and typically presents with male hypogonadism, not primary amenorrhea in a phenotypic female.
• Androgen Insensitivity Syndrome (AIS): Individuals with AIS have a 46,XY karyotype but are resistant to androgens. While AIS can cause primary amenorrhea and female external genitalia, complete AIS (CAIS) usually involves intra-abdominal testes, not ovaries. The presence of normal ovaries in this case makes CAIS less likely.
• Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome: This congenital condition specifically involves the underdevelopment or absence of the uterus, cervix, and the upper portion of the vagina (aplasia/hypoplasia). Importantly, it occurs in individuals with normal ovarian function and thus normal hormonal levels, leading to normal secondary sexual characteristics and primary amenorrhea. This aligns perfectly with the patient's symptoms.
• Prader Willi syndrome: This is a genetic disorder primarily associated with developmental delay, intellectual disability, characteristic facial features, and hormonal issues like obesity and short stature. It is not typically associated with primary amenorrhea due to Mullerian duct anomalies.

Conclusion

Based on the constellation of findings – primary amenorrhea, absent vagina/cervix/uterus, normal secondary sexual characteristics, and present ovaries – Mayer Rockitansky Kuster Hauser syndrome is the most probable diagnosis.