Monarch Disease Ontology entry MONDO_0006476 (undifferentiated gallbladder carcinoma) is a carcinoma without evidence of differentiation arising from the gallbladder. The most common variant is the spindle and giant cell type which resembles a sarcoma. Also known as: anaplastic carcinoma of gallbladder, anaplastic carcinoma of the gallbladder, anaplastic gallbladder carcinoma, gall bladder undifferentiated carcinoma, gallbladder undifferentiated carcinoma, undifferentiated carcinoma of gallbladder, undifferentiated carcinoma of the gallbladder, undifferentiated gallbladder cancer.