A 65-year-old light-complexioned male presents with a solitary scaly plaque like lesion on his forearm present for many years. The lesion is 0.5 cm in diameter. Shave biopsy reveals intraepithelial squamous cell carcinoma. (Bowen’s disease) incompletely excised. Further treatment includes:
## Core Concept
Bowen's disease is a form of **intraepithelial squamous cell carcinoma**, which is a type of skin cancer that remains confined to the **epithelium**. It presents as a slow-growing, scaly plaque, often on sun-exposed areas. Given its superficial nature, treatment options focus on local destruction or removal of the lesion.
## Why the Correct Answer is Right
The correct approach for managing Bowen's disease, especially when the lesion is **incompletely excised**, involves ensuring complete removal of the tumor while considering the cosmetic and functional outcomes. **Mohs surgery** is a highly effective technique for treating Bowen's disease, especially in cosmetically sensitive or functionally critical areas. It allows for **complete margin assessment**, ensuring that all cancerous cells are removed while sparing as much normal tissue as possible.
## Why Each Wrong Option is Incorrect
- **Option A:** This option is not provided, but typically, treatments like simple excision might not always ensure clear margins without the precision of Mohs surgery.
- **Option B:** This option is also not provided, but treatments such as cryotherapy or topical treatments (e.g., 5-fluorouracil) might be considered for Bowen's disease but are usually reserved for smaller lesions or those in less critical areas.
- **Option C:** Similarly, without specifics, other treatments like laser therapy could be considered but might not offer the margin control that Mohs surgery provides.
## Clinical Pearl / High-Yield Fact
A key point to remember is that **Mohs surgery** offers the advantage of **complete margin assessment** during the procedure, making it highly effective for treating **incompletely excised** lesions like Bowen's disease, especially in sensitive areas or when cosmesis is a concern.
## Correct Answer Line
**Correct Answer: D. Mohs surgery**.