Which histologic type is peripheral and most often treated with surgical resection when localized?

• A. Squamous cell
• B. Large cell
• C. Small cell carcinoma
• D. Adenocarcinoma

Answer: (D)

In lung cancer, where the tumor sits in the lung often guides how it’s treated when the disease is confined. Adenocarcinoma typically grows peripherally, space away from the central airways, and thus forms peripheral nodules that can be surgically removed if there’s no spread. When localized, surgical resection (like removing a lobe or a segment) offers the best chance for cure for this pattern.

Small cell carcinoma, in contrast, almost always involves central airways and behaves aggressively with early metastasis, so surgery isn’t the mainstay of treatment. Squamous cell carcinoma also tends to be central, though it can be resectable if localized; however, the classic peripheral location and surgical cure potential in localized disease align best with adenocarcinoma. Large cell carcinoma is less common and, while it can be peripheral, adenocarcinoma is the most typical peripheral histology that’s resectable when localized.