Turner Syndrome

·24 min·2 clips

A patient found out she was genetically male with an inactive Y chromosome, yet developed fully as a woman.

This episode of Pregnancy Pearls focuses on Turner syndrome, a genetic condition affecting females. Host Dr. Nicole Plenty, a board-certified OBGYN and high-risk pregnancy expert, provides a medical overview and discusses specific patient cases. Turner syndrome, or monosomy X, occurs when a female is missing all or part of one X chromosome, affecting about 1 in 2,000 to 2,500 live female births. Common features include short stature, abnormal ovarian development leading to premature ovarian failure, and potential heart, kidney, or skeletal defects. Dr. Plenty explains that mosaic Turner syndrome, where only some cells are affected, occurs in about three out of ten cases and often presents with fewer abnormalities. The condition can be detected by a Non-Invasive Prenatal Screen (NIPS), but Dr. Plenty notes this test has a low positive predictive value of about 30% for true Turner syndrome. A detailed case involves a 28-year-old patient at 17 weeks with a small baby and two large neck cysts, known as cystic hygromas, which are classic findings for Turner syndrome or Down syndrome. Dr. Plenty recommends genetic amniocentesis after 16 weeks for definitive diagnosis, as it can rule out placental mosaicism unlike chorionic villus sampling. She emphasizes that Turner syndrome is typically sporadic and not inherited, so a lack of family history does not reduce risk. In an email question, a listener's NIPS showed a suspicious abnormal X chromosome of maternal origin, which Dr. Plenty says may indicate a personal chromosomal variation with minimal impact on the current pregnancy. She shares an anecdote about a patient who discovered she had XY chromosomes but developed as a woman due to Y chromosome inactivation. A final question concerns a 17-year-old with Turner syndrome and irregular periods; Dr. Plenty states fertility varies, and evaluation by an adolescent gynecologist is needed to assess ovarian reserve. She notes that while most with Turner syndrome have fertility issues, some with mosaicism or sufficient ovarian function can conceive. A surprising insight is that a positive NIPS for sex chromosome abnormalities may sometimes reflect an undiagnosed condition in the pregnant person themselves, not the fetus. Dr. Plenty clarifies that cystic hygromas are the most common ultrasound finding prompting a Turner syndrome workup. The episode reveals that genetic amniocentesis is considered the definitive prenatal diagnostic tool because it analyzes fetal cells directly. It is notable that the psychological impact of learning about one's own chromosomal variations is acknowledged as a real concern. The host explains that the timing of an amniocentesis after 16 weeks is crucial due to the fusion of gestational sac layers. A memorable moment is the story of the patient with XY chromosomes who developed typically as a female, illustrating the complexity of genetic expression. The tone is educational and conversational, blending medical explanations with personal anecdotes and direct answers to listener questions. Dr. Plenty adopts a mentor-like style, addressing the audience as "medical intern" to guide them through case analyses. This episode is ideal for pregnant individuals, especially those who have received ambiguous genetic screening results, or anyone seeking a detailed clinical understanding of Turner syndrome. Listeners who prefer purely narrative storytelling or have no interest in medical genetics might find the technical depth less engaging.

As heard by us

A plainspoken prenatal lesson that makes a scary scan easier to understand.

Pregnancy Pearls gives a plainspoken prenatal lesson on Turner syndrome, starting with why amniocentesis waits until after 16 weeks and moving through the ultrasound findings that lead to closer follow-up. Dr.

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You need a clear read on Turner syndrome after an ultrasound raises questions.

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