All of the following regarding papillary carcinoma thyroid is true except –
**Core Concept**
Papillary carcinoma of the thyroid is a type of well-differentiated thyroid cancer that originates from the follicular epithelial cells. It is the most common type of thyroid cancer, accounting for approximately 85-90% of all thyroid cancer cases.
**Why the Correct Answer is Right**
Papillary carcinoma of the thyroid is characterized by its ability to spread through the lymphatic system, often resulting in the presence of lymph node metastases. This cancer type is also known for its association with certain genetic mutations, such as the BRAF V600E mutation, which is found in approximately 45-50% of papillary thyroid cancers. The cancer cells of papillary carcinoma often exhibit a characteristic feature known as the "orphan Annie eye" appearance due to the clearing of the cytoplasm and the presence of intranuclear pseudoinclusions.
**Why Each Wrong Option is Incorrect**
**Option A:** Papillary carcinoma of the thyroid is not typically associated with a high degree of malignant potential, unlike other types of thyroid cancer such as anaplastic carcinoma.
**Option B:** While papillary carcinoma can metastasize to distant sites, it is less likely to cause distant metastases compared to other types of thyroid cancer.
**Option C:** The presence of lymph node metastases is a common feature of papillary carcinoma of the thyroid, rather than a rare occurrence.
**Clinical Pearl / High-Yield Fact**
It is essential for clinicians to differentiate papillary carcinoma from other types of thyroid cancer, as the management and prognosis of these cancers can vary significantly.
**Correct Answer:** Not provided in original question