Prostate cancer is the most common type of malignancy in males in many parts of the world. Prostate adenocarcinoma is both second leading cause of cancer and cancer death in the North American males. Of the patients who are detected with prostate cancer, about 10-20% of them are found to have metastatic cancer on presentation. Prostate cancer commonly metastasizes to the bones; vertebrae, ribs, long bones and the skull.  Metastasis to pleura is extremely uncommon.
We present a case who presented with pleural effusion and COPD without any urinary complaints. On investigations pleural effusion showed metastatic Adenocarcinoma cells and on search, primary lesion was found in the prostate and there were no bony metastasis. This rare report is presented with the aim that prostate carcinoma can present as pleural effusion without any urinary symptoms and bone metastasis. So while investigating a case of malignant pleural effusion this should be kept in mind.

Key Word:  Prostate Carcinoma; Pleural Effusion; Primary Presentation.