FRI412 A Case of 46,XX Gonadal Dysgenesis With Mayer-Rokitansky-Küster-Hauser Syndrome And Primary Hypothyroidism

Disclosure: S. Al Allawi: None. R. Osman: None. Introduction: The association between Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome and gonadal dysgenesis is rarely reported in the literature. Coexistence of hypothyroidism with this condition is scarce and clinical correlation remains unclear. We describe a case of this rare clinical entity in conjunction with primary hypothyroidism. Clinical case: A 27-year-old Female with a medical history of primary hypothyroidism was referred to our clinic for evaluation of primary amenorrhea. She was born with a female phenotype. Growth was appropriate, but puberty was delayed with self-reported late pubarche at age 19. She never had a menstrual cycle, and had received hormonal replacement therapy (HRT) for a few months but failed to trigger menarche. However due to financial constraints, treatment was not continued. She was diagnosed with hypothyroidism since birth, for which she is currently maintained on levothyroxine 225 mcg daily. On physical exam, blood pressure was 126/72 mmHg, pulse rate 83 BPM, height 5’9”, BMI 34 kg/m(2). No facial dysmorphisms or skeletal deformity were apparent. She had normal pubic and axillary hair distribution, breast budding consistent with Tanner Stage II. Genital examination revealed normal external genitalia and a blind vaginal pouch. Hormonal workup revealed hypergonadotrophic hypogonadism with estradiol < 0.5 pg/mL and post-menopausal range follicle-stimulating hormone (FSH) 36.7 mIU/mL. Thyroid stimulating hormone (TSH) 2.19 uIU/ml (nl 0.45-4.5 uIU/mL) and anti-TPO antibodies 10 IU/mL (nl 0-34 IU/mL). Prior thyroid ultrasound reported a small thyroid gland. Fluorescence in situ hybridization (FISH) analysis revealed 46XX karyotype. Abdominal and pelvic ultrasound showed normal kidneys with a non-visualized uterus and ovaries. Pelvic MRI confirmed the absence of both and showed a blind end vaginal pouch, leading to the conclusion of the coexistence of gonadal dysgenesis with MRKH. She was then placed on transdermal estradioltherapy. Conclusion: The association between gonadal dysgenesis (the most common cause of primary amenorrhea) and MRKH syndrome (the second most common cause) is infrequent. HRT remains the only therapeutic option. It aims to trigger the development of secondary sexual characteristics and prevent osteoporosis by allowing appropriate bone mineral accrual. Unfortunately, infertility remains the most significant consequential issue; hence the availability of good caring and psychological counseling should not be underestimated. The co-existence of likely non-immune primary hypothyroidism is even less frequent. To our knowledge, our case is the second reported case of this trilogy. Given the paucity of data, the association of this condition with primary hypothyroidism cannot be well established and can be coincidental. More studies are needed to determine if this condition has a higher prevalence of hypothyroidism. Presentation: Friday, June 16, 2023