Part 7 · Kidneys, Pregnancy and the Breast
Same concept, other depth: Clinical Reasoning →
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A 3‑month‑old boy has a weak urinary stream and swollen kidneys on ultrasound. An MCU shows a dilated posterior urethra above a thin shelf‑like narrowing: posterior urethral valves, the commonest cause of urinary obstruction in baby boys. Prompt treatment protects his kidneys.
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