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Severe in utero under-virilization in a 46,XY patient with Silver-Russell syndrome with 11p15 loss of methylation.
Journal of Pediatric Endocrinology & Metabolism : JPEM 2019 January 25
Background Silver-Russell syndrome (SRS) is characterized by growth retardation and variable features including macrocephaly, body asymmetry, and genital manifestations such as cryptorchidism in 46,XY patients. Case presentation The patient was born at 39 weeks with a birth weight of 1344 g. Subtle clitoromegaly warranted a thorough evaluation, which disclosed 46,XY karyotype, bilateral undescended testes, and a rudimentary uterus. Because of severe under-virilization, the patient was assigned as female. Failure to thrive, macrocephaly, and body asymmetry led to the diagnosis of SRS, confirmed by marked hypomethylation of H19/IGF2 intergenic differentially methylated region (IG-DMR). From age 9 years, progressive virilization occurred, which necessitated luteinizing hormone-releasing hormone analog (LHRHa) treatment. Gonadal resection at 15 years revealed immature testes with mostly Sertoli-cell-only tubules. Panel analysis for 46,XY-differences of sex development (DSD) failed to detect any pathogenic variants. Conclusions This is the second reported case of molecularly proven 46,XY SRS accompanied by severe under-virilization. SRS should be included in the differential diagnosis of 46,XY-DSD.
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