Are you sure you are referring to the gall bladder? or did you mean the urinary bladder?
When the gall bladder develops a cancer, it is usually an adenocarcinoma histology. For the urinary bladder, the most common is transitional cell carcinoma (also called urothelial carcinoma).
If the gall bladder indeed is involved - the urinary bladder as well as the ureters (the tubes that link the kidney to the urinary bladder) and renal pelvis (part of the kidney that is continuous with the ureter) could be investigated. It is common to have a metastasis from either urinary bladder or ureter to the liver - but gall bladder involvement (if alone without liver involvement) would indeed be a surprise.
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