Abstract
Malignant pleural effusion (MPE ) is due tumor which arises from the mesothelium or metastases from tumor origniating other sites. In large, for undiagnosed unilateral pleural effusions, the most frequent and important diagnosis to be established or excluded is malignancy. Cell block is prepared from residual fluid which is centrifuged or is naturally sedimenting to obtain clots at the bottom of the container. The cell block technique is simple, relatively non-invasive, reproducible and has a high yield for malignant plerual effusion. It plays an important role in the diagnosis, guiding the treatment of maligant pleural effusion. Herein, we summarize the technologys which make the cell block, the differential diagnostic value when multiple sections of the cell block are processed for immunhistochemistry, advantages in the diagnosis of malignant pleural effusion, the clinical value of gene screening in cell block. The aim of this article is to discuss the value of cell block in diagnosis of maligant pleural effusion.