According to your query and sign and symptom you want to know about the disease and cause and it's best Treatment problem as you have mentioned. Please take consultation for better evaluation and best Treatment as it need complete history of patient as personal and family history. Please follow good life style as • take plenty of fluid and • take less spicy and fatty foods and • take home made food only and do exercise regularly with yoga and meditation and • keep positive attitude to fight any disease and any problem of your life .

Colonoscopy should be done first.visit gynaecologist and gastroenterologist doctor ASAP

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The sonography has been done in Darjeeling. I suggest you should go to Kolkata. There is a doubt about whether your sister has ovarian disease or disease of the large intestine. She will certainly need an MRI and Colonoscopy and many biochemical tests. So she should be seen in Kolkata by a Gastro surgeon, a Gynaecologist and an Oncho Surgeon.

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Few more details needed for evaluation. Consult immediately on practo or eight three one eight four six nine eight eight six

Go for physical consultation with gynecologist

Can help you, kindly consult and provide detailed history for proper diagnosis and further management

Need few more details Kindly consult