Which NSCLC histology is typically peripheral?

Which NSCLC histology is typically peripheral?

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

Answer: (A)

The idea being tested is where NSCLC subtypes most often appear in the lungs. Adenocarcinoma is the histology that tends to arise in the peripheral lung tissue, near the outer edges of the lungs and often adjacent to the pleura. This peripheral location is a hallmark that helps distinguish it from other NSCLC types. Squamous cell carcinoma and small cell carcinoma are more commonly central, near the main bronchi and hilum, reflecting their origins in the central airways and neuroendocrine cells, respectively. Large cell carcinoma can be peripheral but does not have as consistent a central-versus-peripheral pattern as the others. So, adenocarcinoma is best because its peripheral predilection aligns with its typical site of origin in the lung parenchyma, producing imaging features like peripheral nodules or masses.

The idea being tested is where NSCLC subtypes most often appear in the lungs. Adenocarcinoma is the histology that tends to arise in the peripheral lung tissue, near the outer edges of the lungs and often adjacent to the pleura. This peripheral location is a hallmark that helps distinguish it from other NSCLC types.

Squamous cell carcinoma and small cell carcinoma are more commonly central, near the main bronchi and hilum, reflecting their origins in the central airways and neuroendocrine cells, respectively. Large cell carcinoma can be peripheral but does not have as consistent a central-versus-peripheral pattern as the others.

So, adenocarcinoma is best because its peripheral predilection aligns with its typical site of origin in the lung parenchyma, producing imaging features like peripheral nodules or masses.