🧬 Section 99.2 · Abnormalities of Chromosome Number

Nelson Textbook of Pediatrics 22nd Edition | Aneuploidy (trisomy 21,18,13), sex chromosome aneuploidy (Turner, Klinefelter, 47,XXX, 47,XYY), polyploidy, mosaicism, nondisjunction, clinical recognition, and diagnostic methods (karyotype, FISH, CMA, NIPS).

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📋 30 Clinical Scenarios — Abnormalities of Chromosome Number (FCPS level)

📇 High‑Yield Review Cards (Chromosome Number Abnormalities)

🩺 Clinical Recognition: Numerical Chromosome Abnormalities

Click any syndrome to review key clinical features, karyotype, incidence, and management pearls.
⭐ Key: Most common aneuploidy in live births: Trisomy 21 (Down syndrome). Most common sex chromosome aneuploidy: 47,XXY (Klinefelter). Mosaicism can modify phenotype.

📋 Stepwise Approach: Diagnosis & Management of Chromosome Number Abnormalities

    ⚡ Reflex Prompts — Chromosome Aneuploidy Recognition

    📖 Summary: Abnormalities of Chromosome Number — Nelson 22nd Ed, Section 99.2