Water in lungs and pain in chest and waist! Cancer?

Hi,
My mom had a pain in chest (especially in lower three right ribs) and pain in waist. The pain in waist is on right side as well and it would start in front and radiate towards back. She went to see a doctor about a month ago and nothing came out in ECG and X-ray reports. But few days back her pain started becoming severe and intolerable. Then she went to see another doctor and he sent her for chest X-ray and ultrasound. In ultrasound report it was discovered that she has water accumalated under lungs and the doctor said its TB. But the doctor has no answer why there is such a severe pain in waist. We went to another doctor for a second opinion and after getting blood test, digital X-ray and ultrasound the decided to take out the water from the body. They took out about 900ml. of water and doctor started TB medicines. He also said that if there is further fluid accumulation then there is a 50% chance of cancer otherwise its TB. He also referred her to a cancer sepcialist and the cancer specialist said that since the color of fluid that was taken out from body was little reddish in color so it favors the chance of lung cancer. Now with all these reports I am compltely confused and do not know what to do. None of these doctors told me the reason of fluid accumulation and pain in the waist. Also, if its a cancer then what's the best test to confirm it and can it be cured. I would highly appreciate any of your suggestions.
Regards,
Nayeem

When I had what was called "Plueral effussion", when they drained it, they found a lot of blood in what is supposed to be clear liquid. For me, that meant cancer.

Do not waste time ..get your mother to a highly recognized local cancer ctr or better yet contact Sloan Kettering in NY
Time is very important

Yes, this may be cancer. Take her to a cancer center and taking a biopsy test it will be confirmed whether she got cancer. If so chemotherapy is the only one treatment available now. But don't waste time.

I heard like this case that its a lung cancer. But you really go to some doctor that is specialist because it might be in stage1or2.
It can't directly find if its in the stage 1.