A 34 year old patient presented with thyroid nodule. Ultrasonography of the thyroid nodule shows foci of calcification. Histological features are shown in the diagram below, what is your likely diagnosis?
**Core Concept**
The question tests the ability to diagnose thyroid nodules based on histological features and ultrasonographic findings. The presence of foci of calcification on ultrasonography and specific histological features are crucial in differentiating between various thyroid lesions.
**Why the Correct Answer is Right**
The presence of foci of calcification on ultrasonography and the histological features shown in the diagram are suggestive of a **papillary thyroid carcinoma**. Papillary thyroid carcinoma is a type of thyroid cancer that often presents as a thyroid nodule. The histological features of papillary thyroid carcinoma include **Orphan Annie eye nuclei**, **psammoma bodies**, and **papillae**. The presence of foci of calcification on ultrasonography is also a characteristic feature of papillary thyroid carcinoma. The calcification is often seen as a **microcalcification** or **macrocalcification** within the thyroid nodule.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is likely a type of benign thyroid lesion, such as an **adenoma** or a **thyroid cyst**. These lesions do not typically present with the characteristic histological features of papillary thyroid carcinoma.
* **Option B:** This option may be a type of thyroid cancer, such as **follicular thyroid carcinoma**. However, follicular thyroid carcinoma does not typically present with the characteristic histological features of papillary thyroid carcinoma, such as **Orphan Annie eye nuclei** and **psammoma bodies**.
* **Option C:** This option may be a type of thyroiditis, such as **Hashimoto thyroiditis**. Thyroiditis does not typically present as a thyroid nodule with foci of calcification on ultrasonography.
**Clinical Pearl / High-Yield Fact**
A classic exam trick to remember the histological features of papillary thyroid carcinoma is to recall the **"Orphan Annie eye nuclei"** and **"psammoma bodies"**. These features are often seen in papillary thyroid carcinoma and can be a key differentiator from other types of thyroid lesions.
**Correct Answer:** C.