BACKGROUND Pleural carcinosis is caused by tumors of the chest (e.g., lung and breast cancer) or elsewhere in the body (e.g., ovarian carcinoma) that metastasize to the visceral and/or parietal pleura. Recurrent malignant pleural effusion due to pleural carcinosis is one of the most common findings in oncology. It affects about 56 000 patients per year in Germany alone. METHODS This review is based on pertinent literature retrieved by a selective search of the Medline database (key words: malignant pleural effusion, pleural carcinosis) and on the authors' clinical experience. RESULTS Although many retrospective studies have been published, there has been only one randomized controlled trial of treatment, in which permanent pleural catheters were compared with talcum pleurodesis. Patients with pleural carcinosis have a median survival of less than 12 months. Many are suffering from progression of their underlying disease, with generalized tumor involvement; thus, the symptomatic treatment of pain and dyspnea is often the main therapeutic issue. The underlying tumor, usually an adenocarcinoma, can be diagnosed either by histology or by cytology. The main complication is progressive respiratory failure. The treatment is palliative, rather than curative. The main approaches are drainage of the effusion (by thoracocentesis or with permanent pleural catheters) and pleurodesis (obliteration of the pleural space by causing the visceral and parietal pleura to adhere to each other). CONCLUSIONS Pleural carcinosis with symptomatic malignant pleural effusion is treated palliatively. The appropriate treatment in each case should be determined through discussion with the patient, with the goal of improving the patient's quality of life.