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Mayer-Rokitansky-Küster-Hauser syndrome (MRKH), also known as Müllerian aplasia, is a congenital anomaly characterized by vaginal and uterine aplasia or agenesis 9. It is usually also associated with a spectrum of other genitourinary tract abnormalities. MRKH syndrome belongs to class I Mullerian duct anomalies.
Two different forms are described:
- the typical form (type A) of this syndrome is characterized by congenital absence of the uterus and upper 2/3 vagina with normal ovaries and fallopian tubes
- the atypical form (type B) of the syndrome includes associated abnormalities of the ovaries and fallopian tubes and renal anomalies
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It has a reported incidence of ~1:4000-5000 live female births.
The typical presentation is that of primary amenorrhea, with normal hormonal levels guaranteed by fully functional gonads. At times cyclic pelvic pain may be present in the post-pubertal period due to an accumulation of hemorrhagic material within uterine buds with a functioning endometrium.
The anomaly is thought to arise during embryogenesis, with arrested development of the paramesonephric ducts at ~7 weeks after fertilisation.
MRKH syndrome is generally characterized by normal external genitalia and absence or reduced development of the uterus and upper two-thirds of the vagina.
The fallopian tubes, uterus, cervix and upper ¾ of vagina develop from the Müllerian ducts from the 8th-12th gestational weeks. A developmental defect occurring at this stage leads to agenesis of Müllerian structures. The development of kidneys, ureter, and bladder occurs concomitantly at around the 6th-12th weeks of gestation. The presence of residual components such as a blind vaginal pouch and a rudimentary uterus (non-functioning myometrial tissue) are noted in a significant proportion of patients.
The syndrome is often associated with alterations in the urinary or skeletal system which include:
- vertebral anomalies: may be present in ~10% of cases
- renal anomalies: such as renal agenesis, ectopic kidney, fused kidney, renal hypoplasia, and horseshoe kidney may be seen in 30-40% of patients with the syndrome 4
Although hysterosalpingography has a well-established use in characterizing uterine Mullerian duct anomalies, it has no place in MRKH syndrome given the hypoplasia/agenesis of the uterus and 2/3 of vagina.
Usually there is absence of the uterus and normal ovaries. Also, ultrasound may demonstrate any associated renal tract anomaly.
This is the imaging modality of choice after initial assessment with ultrasound, allowing characterization of the uterine buds and presence of functioning endometrium within them.
History and etymology
It is named after the German physician August Franz Josef Karl Mayer (1787-1865), Austrian pathologist Karl Freiherr von Rokitansky (1804-1878), German gynecologist Hermann Küster (1879-?) and the Swiss physician Georges André Hauser (1921-?) 7,8.
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- 5. Saleem SN. MR imaging diagnosis of uterovaginal anomalies: current state of the art. Radiographics. 23 (5): e13. doi:10.1148/rg.e13 - Pubmed citation
- 6. Preibsch H, Rall K, Wietek BM et-al. Clinical value of magnetic resonance imaging in patients with Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome: diagnosis of associated malformations, uterine rudiments and intrauterine endometrium. (2014) European radiology. 24 (7): 1621-7. doi:10.1007/s00330-014-3156-3 - Pubmed
- 7. William Alexander Newman Dorland. Dorland's Illustrated Medical Dictionary. (2018) ISBN: 9781416023647
- 8. Patnaik SS, Brazile B, Dandolu V et-al. Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome: a historical perspective. (2015) Gene. 555 (1): 33-40. doi:10.1016/j.gene.2014.09.045 - Pubmed
- 9. Herlin M, Petersen M, Brännström M. Mayer-Rokitansky-Küster-Hauser (MRKH) Syndrome: A Comprehensive Update. Orphanet J Rare Dis. 2020;15(1):214. doi:10.1186/s13023-020-01491-9 - Pubmed