A 24-year-old male presented with a swelling on anterior aspect of neck. On examination the swelling was firm and moved with deglutination. Biopsy from the lesion has been shown. What is the typical finding and diagnosis?
**Core Concept**
The question is testing the student's knowledge of the anatomical and clinical characteristics of a specific type of neck swelling. The correct answer requires an understanding of the embryological development of the thyroid gland and its relationship with surrounding structures.
**Why the Correct Answer is Right**
The swelling on the anterior aspect of the neck that moves with deglutination (swallowing) is suggestive of a thyroid gland pathology. The biopsy is likely to show a specific histopathological feature that is typical for this condition. The thyroid gland develops from the thyroid diverticulum, which arises from the floor of the pharynx. As the thyroid gland descends during embryological development, it is closely associated with the laryngeal cartilages and the esophagus, which explains its movement with deglutination.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not match the clinical presentation of the swelling. The described location and movement of the swelling are not typical for a parotid gland pathology.
* **Option B:** This option is incorrect because it is not consistent with the histopathological findings of a thyroid gland pathology. The biopsy would not show squamous cell carcinoma, which is more typical of skin or mucosal cancers.
* **Option C:** This option is incorrect because it does not match the clinical presentation of the swelling. The described location and movement of the swelling are not typical for a lymph node pathology.
* **Option D:** This option is incorrect because it does not match the histopathological findings of a thyroid gland pathology. The biopsy would not show adenocarcinoma, which is more typical of glandular cancers.
**Clinical Pearl / High-Yield Fact**
A key clinical correlation to remember is that any neck swelling that moves with deglutination should raise suspicion for a thyroid gland pathology. This is because the thyroid gland is closely associated with the laryngeal cartilages and the esophagus during embryological development.
**Correct Answer:** B. Thyroid adenoma with colloid goiter.