Turner Syndrome (45,X)

⏱️ 30 mins read 📖 Genetics 🎯 MLA Relevance: High

Turner syndrome (45,X or mosaic) is a common sex chromosome aneuploidy in females causing short stature, ovarian failure and a range of associated features.

📌 Learning Objectives

Describe the underlying mechanism of Turner Syndrome (45,X).
Identify the key clinical features and complications of Turner Syndrome (45,X).
Outline the appropriate investigations and management of Turner Syndrome (45,X).
Discuss the implications for patients and families of Turner Syndrome (45,X).

📋 Overview

Features include short stature, webbed neck, cubitus valgus, coarctation of the aorta, bicuspid aortic valve, lymphoedema in neonates, and streak ovaries causing primary amenorrhoea.

🔬 Basic Science

Features include short stature, webbed neck, cubitus valgus, coarctation of the aorta, bicuspid aortic valve, lymphoedema in neonates, and streak ovaries causing primary amenorrhoea.

🏥 Clinical Relevance

Cardiac surveillance is required throughout life due to aortic dissection risk.

🧪 Investigations

Investigation depends on clinical context: relevant blood tests, imaging, and specific genetic or histopathological tests as appropriate. Refer to specialist services where indicated.

💊 Management

Management is condition-specific and typically multidisciplinary, combining medical therapy, surgical intervention where appropriate, supportive care, and family/genetic counselling.

Revision Resources – expand the sections below for high-yield notes, exam pearls, key facts and further reading.

🎯 MLA High-Yield Notes & Quick Revision ⌄

Common SBA themes: recognising the underlying mechanism, identifying classic clinical features, and choosing the first-line investigation or management step. Watch for inheritance pattern and characteristic associations.

turner 45,x short stature coarctation streak ovary

Turner syndrome karyotype: 45,X or mosaic (e.g. 45,X/46,XX).
Short stature and ovarian failure are nearly universal.
Cardiac anomalies include bicuspid aortic valve and coarctation of the aorta.
Renal anomalies (e.g. horseshoe kidney) occur in ~30%.
SHOX gene haploinsufficiency contributes to short stature.

⭐ Exam Pearls ⌄

⭐ High Yield

Turner syndrome karyotype: 45,X or mosaic (e.g. 45,X/46,XX).

Short stature and ovarian failure are nearly universal.

Cardiac anomalies include bicuspid aortic valve and coarctation of the aorta.

Renal anomalies (e.g. horseshoe kidney) occur in ~30%.

SHOX gene haploinsufficiency contributes to short stature.

💡 Clinical Pearl

Turner: Cardiac surveillance is required throughout life due to aortic dissection risk.

⚠️ Exam Tip — Common Mistakes

Confusing the mechanism of Turner Syndrome (45,X) with related conditions.

Missing classic clinical features of Turner Syndrome (45,X) in SBA stems.

Failing to consider Turner Syndrome (45,X) in the differential diagnosis.

🔑 Key Facts ⌄

Turner syndrome karyotype: 45,X or mosaic (e.g. 45,X/46,XX).

Short stature and ovarian failure are nearly universal.

Cardiac anomalies include bicuspid aortic valve and coarctation of the aorta.

Renal anomalies (e.g. horseshoe kidney) occur in ~30%.

SHOX gene haploinsufficiency contributes to short stature.

🔗 Related Topics ⌄

📚 References ⌄

GMC MLA Content Map
NICE Clinical Knowledge Summaries
BMJ Best Practice

Further Resources

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