Question
Which of the following is true?
| A. |
Colloid goitre mostly presents as hyperthyroidism
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| B. |
Thyroid storm, the clinical features are primarily due to increased thyroxine
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| C. |
Excess calcium intake can lead to hyperthyroidism
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| D. |
Goitre more than 5 percent of population is endemic goitre
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Show Answer
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Correct Answer » D
Explanation
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- Endemic goitre is defined as enlargement of the thyroid gland affecting more than 5% of the population in a defined geographical area.
- The most common cause is iodine deficiency.
Why Other Options are Incorrect
Option A: Colloid goitre most commonly presents with hyperthyroidism.
- Incorrect.
- Colloid (simple/nontoxic) goitre is usually associated with euthyroidism.
- Occasionally, long-standing multinodular goitre may become toxic, but this is not the usual presentation.
Option B: In thyroid storm, the clinical features are primarily due to increased circulating thyroxine (T4) levels.
- Incorrect.
- Thyroid storm is caused by a sudden increase in the peripheral effects of thyroid hormones, with markedly increased adrenergic activity, rather than a significant rise in serum T3 or T4 levels.
- Hormone levels are often similar to those seen in uncomplicated thyrotoxicosis.
Option C: Excess calcium intake can lead to hyperthyroidism.
- Incorrect.
- Calcium intake has no role in causing hyperthyroidism.
- Excess iodine intake (Jod-Basedow phenomenon) may precipitate hyperthyroidism in susceptible individuals.
