Malignant pleural effusion resulting from metastatic well differentiated adenocarcinoma of mammary or pulmonary origin may not be easy to detect by casual low power evaluation.

• 源自于乳腺或肺的分化良好的癌性胸膜腔渗出液的细胞学检查不能轻易通过低倍镜观察作出判断。