Most common malignant tumour of parotid is
**Core Concept**
The most common malignant tumour of the parotid gland is a type of neoplasm that arises from the salivary gland tissue. The parotid gland is the largest of the salivary glands and is located in the preauricular region of the face. The most common malignant tumour of the parotid gland is a type of epithelial neoplasm that can arise from the ductal or acinar cells of the salivary gland.
**Why the Correct Answer is Right**
The most common malignant tumour of the parotid gland is **Warthin's tumour** (Option B). This is because Warthin's tumour is a type of adenocarcinoma that arises from the ductal cells of the salivary gland and is known to occur in the parotid gland. Warthin's tumour is a slow-growing tumour that is typically benign, but can occasionally be malignant. The exact cause of Warthin's tumour is unknown, but it is thought to be related to chronic irritation of the salivary gland. Warthin's tumour is often associated with smoking and is more common in men.
**Why Each Wrong Option is Incorrect**
**Option A:** **Pleomorphic adenoma** is the most common benign tumour of the parotid gland, not the most common malignant tumour.
**Option C:** **Mucoepidermoid carcinoma** is a type of malignant tumour that can occur in the parotid gland, but it is not the most common type.
**Option D:** **Adenocarcinoma** is a type of malignant tumour that can occur in the parotid gland, but it is not specific to the parotid gland and can occur in other salivary glands.
**Clinical Pearl / High-Yield Fact**
Warthin's tumour is often associated with smoking and is more common in men. It is essential to diagnose Warthin's tumour early, as it can occasionally be malignant. A high index of suspicion and a thorough clinical examination are crucial in diagnosing Warthin's tumour.
**Correct Answer:** B. Warthin's tumour.