Although superior vena cava syndrome is a common complication of small cell lung cancer, our case may have resulted from an intracardiac invasion, which is rarely seen clinically.

• 虽上腔静脉症候群是小细胞肺癌常见的并发症，但在我们的病例上，却可能是罕见的左右心房转移造成的临床表现。