Question:
Boot shape of heart in TOF is due to:
Boot shape of heart in TOF is due to:
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Upturned apex from a thick right ventricle gives the clog shape.
Updated On: Jun 23, 2026
- Left atrial enlargement
- Right atrial enlargement
- Right ventricular hypertrophy
- Biventricular hypertrophy
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The Correct Option is C
Solution and Explanation
Step 1: Recognise the sign. The boot-shaped heart (coeur en sabot) is the chest radiograph appearance seen in some cases of Tetralogy of Fallot (TOF). Step 2: The shape arises from an upturned cardiac apex together with a concave pulmonary arterial segment. Step 3: The apex is lifted up because of right ventricular hypertrophy, which is one of the four components of TOF (along with VSD, overriding aorta and pulmonary stenosis). Step 4: Therefore the boot shape is due to right ventricular hypertrophy. Atrial enlargement or biventricular hypertrophy do not produce the upturned apex characteristic of this radiographic sign, so the other options are wrong.
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