All of the following is true about inveed papilloma of nose except :
**Core Concept**
Inverted papilloma of the nose is a type of benign epithelial tumor that originates from the mucosal lining of the nasal cavity. It is characterized by its inverted or flask-shaped appearance, with the tumor cells growing inward from the surface epithelium.
**Why the Correct Answer is Right**
Inverted papilloma is a type of tumor that typically arises from the Schneiderian epithelium, which lines the nasal cavity and paranasal sinuses. It is often associated with a high risk of malignant transformation, with up to 10% of cases progressing to squamous cell carcinoma. The tumor cells in inverted papilloma are known to invade and destroy the underlying bone and cartilage, leading to significant destruction of the nasal structure.
**Why Each Wrong Option is Incorrect**
**Option A:** Inverted papilloma is a malignant tumor - **Incorrect** because it is typically benign, although it has a high risk of malignant transformation.
**Option B:** Inverted papilloma is caused by a viral infection - **Incorrect** because the exact cause of inverted papilloma is still unknown, but it is thought to be related to chronic inflammation and trauma to the nasal mucosa.
**Option C:** Inverted papilloma is a type of adenocarcinoma - **Incorrect** because it is a type of squamous cell tumor that arises from the epithelial lining of the nasal cavity.
**Clinical Pearl / High-Yield Fact**
A key characteristic of inverted papilloma is its tendency to cause significant destruction of the underlying bone and cartilage, which can lead to nasal obstruction, epistaxis, and other complications.
**Correct Answer: A. Inverted papilloma is a malignant tumor.**