Pencil-in-cup deformity is seen in
**Question:** Pencil-in-cup deformity is seen in
A. Hypothyroidism
B. Hyperthyroidism
C. Congenital adrenal hyperplasia
D. Congenital adrenal insufficiency
**Correct Answer:** **B. Hyperthyroidism**
**Core Concept:** Pencil-in-cup deformity is a clinical sign characterized by a "pencil-shaped" enlargement of the adrenal glands, which appear as a "cup" when viewed from a lateral abdominal radiograph. This sign is indicative of an adrenal insufficiency.
**Why the Correct Answer is Right:** Hyperthyroidism, on the other hand, is characterized by an overproduction of thyroid hormones, leading to symptoms such as weight loss, increased appetite, and nervousness. The adrenal glands remain unaffected in hyperthyroidism.
**Why Each Wrong Option is Incorrect:**
A. Hypothyroidism: This condition is characterized by underproduction of thyroid hormones, leading to symptoms such as fatigue, weight gain, and constipation. The adrenal glands are not involved in hypothyroidism, making option A incorrect.
C. Congenital adrenal hyperplasia: This is a group of inherited disorders characterized by adrenal gland enlargement due to excess aldosterone production. While adrenal glands may be enlarged, they do not appear pencil-shaped in this condition.
D. Congenital adrenal insufficiency: This is a group of inherited disorders characterized by adrenal gland dysfunction. However, the adrenal glands in these cases are not enlarged, making option D incorrect.
**Clinical Pearl:** The Pencil-in-cup deformity sign, visible on abdominal radiographs, is a valuable diagnostic clue for adrenal insufficiency, particularly in cases where clinical symptoms are non-specific or absent. This sign helps differentiate between adrenal insufficiency (hypoadrenalism) and hyperthyroidism (hyperadrenalism). In cases of adrenal insufficiency, the pencil-in-cup deformity sign is indicative of adrenal gland enlargement, while in hyperthyroidism, the adrenal glands remain normal in size. This helps in narrowing down the differential diagnosis and guiding further testing and management.