**Question:** All statements about papillary thyroid cancer are true except:

A. Papillary thyroid cancer is the most common type of thyroid cancer.
B. Papillary thyroid cancer is often asymptomatic in its early stages.
C. Papillary thyroid cancer typically presents with a painful mass in the neck.
D. Papillary thyroid cancer has a very high mortality rate.

**Correct Answer: C.**

**Core Concept:** Papillary thyroid cancer is a type of thyroid cancer that accounts for about 80-85% of all thyroid cancer cases. The thyroid gland is a butterfly-shaped endocrine gland located in the neck, responsible for producing thyroid hormones like thyroxine (T4) and triiodothyronine (T3).

**Why the Correct Answer is Right:**
Papillary thyroid cancer is the most common type of thyroid cancer due to its frequent occurrence worldwide. It is often asymptomatic in its early stages, which is why statement B is also true. However, statement C is incorrect because papillary thyroid cancer typically presents with a slow-growing, painless swelling in the neck called a thyroid nodule. This is due to the tumor's slow growth rate and low-grade malignancy. Statement D is not entirely accurate because papillary thyroid cancer has a generally favorable prognosis when detected and treated early.

**Why Each Wrong Option is Incorrect:**
Statement A is correct because although papillary thyroid cancer is common, it is not the only thyroid cancer type. Other types like follicular thyroid cancer can also occur. Statement D is incorrect because papillary thyroid cancer has a high survival rate when diagnosed early and treated appropriately. The mortality rate is actually low, but the focus should be on the excellent prognosis rather than mortality.

**Clinical Pearl:**
A high index of suspicion is crucial for detecting thyroid cancer at an early stage. A thyroid nodule found during a routine physical examination or a patient's complaint should prompt further evaluation, including serum thyroid function tests, thyroid ultrasound, and fine-needle aspiration biopsy (FNAB). Early detection and treatment improve the prognosis of thyroid cancer types, including papillary thyroid cancer.