PAEA Surgery End Of Rotation (EOR) Practice Exam

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What is another name for squamous cell carcinoma when it is in situ?

Keratoacanthoma
Bowen's disease
Basal cell carcinoma
Melanoma

The correct answer is: Bowen's disease

When squamous cell carcinoma is described as being in situ, it refers to a localized stage of the disease where the cancerous cells are present in the outer layer of the skin but have not invaded deeper tissues. This condition is known as Bowen's disease. It is characterized by the abnormal growth of squamous cells and can be identified as a potentially pre-cancerous condition that, if left untreated, may progress to invasive squamous cell carcinoma. Bowen's disease is distinct in that it specifically refers to the in situ form of squamous cell carcinoma, allowing for early diagnosis and treatment options, which can significantly improve patient outcomes. The term helps in distinguishing it from other skin conditions and forms of skin cancer that do not share the same properties regarding invasiveness and treatment implications. Other conditions mentioned, such as keratoacanthoma, basal cell carcinoma, and melanoma, either represent different types of skin tumors or different stages of cancer that are unrelated to the in situ stage of squamous cell carcinoma, thereby affirming that Bowen's disease is indeed the correct nomenclature in this context.