Thanks for your question on HCM. I can understand your situation and problem. X ray reporting of ypur mother is suggestive of massive pleural effusion. Pleural effusion is clooection of fluid between two layers of pleura. Normally 15-20ml of fluid is present to avoid friction and it also helps in lung expansion. But when these fluid accumulation is more, it starts compressing lung (same side). So we need to remove the fluid so that lung expands and at the same time we need to search for the cause of pleural effusion and start appropriate treatment, so that further fluid accumulation can be prevented. So consult pulmonologist and get done pleural fluid tapping (aspiration) and send for 1. Routine microscopic examination 2. Protein and sugar 3. Culture and sensitivity 4. Cytology. Following are the possible causes for massive effusion. 1. Tuberculosis 2. Pneumonia 3. Malignancies etc. So better to consult pulmonologist and discuss all these.