Pancoast syndrome is most commonly associated with which histologic type of lung cancer?

Pancoast syndrome is most commonly associated with which histologic type of lung cancer?

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

Answer: (B)

Pancoast syndrome reflects tumor invasion at the lung apex and into nearby structures such as the brachial plexus and sympathetic chain. This pattern is most classically seen with squamous cell carcinoma, a central bronchogenic tumor that often grows toward the apical region and can extend into the superior sulcus. The central location and local invasive behavior explain the characteristic symptoms—shoulder/arm pain from neural involvement and Horner’s syndrome from sympathetic chain invasion. Other histologies tend to have different growth patterns: adenocarcinoma is more peripheral, making apical invasion less likely; small cell carcinoma is central but usually presents with rapid spread and systemic effects rather than a focal apical invasion; large cell carcinoma is less specifically associated with apical involvement. Hence squamous cell carcinoma is the histologic type most commonly linked to Pancoast syndrome.

Pancoast syndrome reflects tumor invasion at the lung apex and into nearby structures such as the brachial plexus and sympathetic chain. This pattern is most classically seen with squamous cell carcinoma, a central bronchogenic tumor that often grows toward the apical region and can extend into the superior sulcus. The central location and local invasive behavior explain the characteristic symptoms—shoulder/arm pain from neural involvement and Horner’s syndrome from sympathetic chain invasion.

Other histologies tend to have different growth patterns: adenocarcinoma is more peripheral, making apical invasion less likely; small cell carcinoma is central but usually presents with rapid spread and systemic effects rather than a focal apical invasion; large cell carcinoma is less specifically associated with apical involvement. Hence squamous cell carcinoma is the histologic type most commonly linked to Pancoast syndrome.