A teenager has a progressively increasing soft reddish swelling on his chest. Its histological appearance is given below. Which of the following is the likely diagnosis?
First, the core concept here is likely a dermatological condition. The key features are a soft, reddish swelling. Common possibilities could be a hemangioma, pyogenic granuloma, or maybe a lipoma. But since it's a teenager and progressive, pyogenic granuloma comes to mind. These are benign vascular tumors that can appear suddenly and grow rapidly, often after minor trauma. They are red, soft, and can bleed easily.
The histology would show a lobular proliferation of capillaries with a fibrovascular stroma. If the options included pyogenic granuloma, that would be the correct answer. Now, let's consider why other options are wrong. Hemangiomas are more common in infants and are usually present at birth. Lipomas are more yellow, not red. Basal cell carcinoma is less likely in a teenager.
The clinical pearl here is that pyogenic granulomas often have a history of trauma and can bleed easily. They may resolve spontaneously but sometimes require treatment. The correct answer would be the option corresponding to pyogenic granuloma.
**Core Concept**
This question tests knowledge of **benign vascular skin lesions** in adolescents. The clinical presentation of a progressive, red, soft swelling suggests a **pyogenic granuloma**, which is a common acquired reactive vascular lesion. Histologically, it shows a **lobular proliferation of capillaries** with a fibrovascular stroma and a superficial epithelial ulceration.
**Why the Correct Answer is Right**
Pyogenic granuloma (also called **granuloma pyogenicum**) is a benign, rapidly growing lesion triggered by minor trauma or hormonal changes (e.g., puberty). It presents as a **bright red, pedunculated nodule** that bleeds easily. Histologically, it features **proliferating capillaries** with a **fibroblastic stroma** and a **characteristic "sea anemone" appearance**. The soft consistency and reddish hue align with its vascular nature.
**Why Each Wrong Option is Incorrect**
**Option A:** Hemangioma is a congenital vascular malformation, typically present at birth or in infancy, not a progressive lesion in adolescents.
**Option B:** Lipoma is a yellow, firm subcutaneous lesion, not red or soft.
**Option C:** Basal cell carcinoma is rare in teenagers and presents as a pearly nodule with telangiectasia, not a soft, reddish swelling.
**Clinical Pearl / High-Yield Fact**
Pyogenic granulomas often arise after **minor trauma** (e.g., a pinprick) and may regress spontaneously. They are **not pyogenic** (not bacterial) but named for their granulomatous appearance. Distinguish from **pyogenic granuloma of pregnancy** (a similar entity in adults).
**Correct Answer: D. Pyogenic granuloma**