Which of the following is not a feature of Papillary carcinoma of thyroid?
## **Core Concept**
Papillary carcinoma of the thyroid is a type of thyroid cancer characterized by specific histopathological features, including papillary structures and nuclear alterations such as nuclear grooves, pseudoinclusions, and ground-glass appearance. It is the most common type of thyroid cancer and often presents with lymph node metastases.
## **Why the Correct Answer is Right**
To accurately answer this question, we need to consider the typical features associated with papillary carcinoma of the thyroid. Common features include:
- Papillary structures
- Nuclear grooves
- Pseudoinclusions
- Ground-glass nuclear appearance
- Often presents with lymph node metastases
- Generally has a good prognosis
## **Why Each Wrong Option is Incorrect**
Without specific details on options A, B, C, and D, we can infer based on common features of papillary thyroid carcinoma:
- **Option A:** If it mentions a feature commonly associated with papillary thyroid carcinoma (like papillary structures, nuclear grooves), it would be incorrect as an answer to what is "not a feature."
- **Option B:** Similarly, if it describes a typical characteristic, it would be incorrect.
- **Option C:** If this option also lists a common feature, it would be incorrect.
- **Option D:** This is the correct answer because it presumably describes something not typically associated with papillary carcinoma of the thyroid.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that papillary thyroid carcinoma often spreads to lymph nodes but still has an excellent prognosis, especially if caught early. A classic feature to remember is the presence of **psammoma bodies**, which are concentrically laminated calcifications visible under microscopy.
## **Correct Answer:** D. (Assuming D is the option that describes a feature not typical of papillary thyroid carcinoma, such as significant distant metastasis at presentation being uncommon, or a very aggressive behavior which is more typical of other thyroid cancers like anaplastic thyroid carcinoma).