A 58 years male, non smoker, non alcoholic, vegetarian, complaining of wt loss initially 4kg in 3 months, and now gained 2kg, found to have this rounded cyst like shadow in rt cardio-phranic angle. He has taken allopathic therapy, next went Ayush therapy, now came to again Allopathic treatment. CBC, RFT, LFT, HIV, HbA1C, HbsAg are normal.

Ctscan CHEST is not conclusive, report posted. PLEASE ADVISE FOR HIM, WHAT NEXT INVESTIGATIONS TO REACH FINAL DIAGNOSIS?