Fir tree pattern lesion on trunk is seen in: September 2009
**Core Concept**
The fir tree pattern lesion on the trunk is a characteristic dermatological manifestation associated with a specific condition. This pattern is indicative of a particular type of vascular anomaly that leads to skin changes.
**Why the Correct Answer is Right**
The fir tree pattern lesion is characteristic of _Pyogenic Granuloma_ (also known as lobular capillary hemangioma). This condition is a benign vascular tumor that arises from the skin, often in response to minor trauma or irritation. The fir tree pattern is due to the formation of multiple small, dilated capillaries that give the skin a characteristic "tree-like" appearance. The pathogenesis of pyogenic granuloma involves the proliferation of endothelial cells and the formation of new blood vessels, leading to increased vascularity and the development of this distinctive skin lesion.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not match the description of the fir tree pattern lesion.
**Option B:** This option is incorrect as it does not accurately describe the characteristic skin changes seen in pyogenic granuloma.
**Option C:** This option is incorrect as it is not a condition associated with a fir tree pattern lesion on the trunk.
**Clinical Pearl / High-Yield Fact**
Pyogenic granuloma is a common vascular tumor that can be easily mistaken for other skin lesions, such as melanoma or basal cell carcinoma. However, its characteristic fir tree pattern and history of recent trauma can help differentiate it from other conditions.
**Correct Answer:** D. Pyogenic Granuloma