Carcinosarcoma of the gallbladder—an exceedingly rare tumour

Carcinosarcoma of the gallbladder (CSGB) is an extremely rare tumour that presents variable proportions of malignant epithelial and mesenchymal elements. Preoperative diagnosis of CSGB is challenging owing to its non-specific clinical presentation and imaging findings. The final diagnosis requires histopathological confirmation of both the epithelial and mesenchymal components. Owing to the low incidence and poor prognosis of this tumour, it is essential to gather all the individual experience-based information. We report a case of a 52-year-old female who presented with right upper abdominal pain and vomiting for 2 weeks and a painless palpable mass on the right upper quadrant of the abdomen. Imaging studies showed a complex gallbladder mass, which was pathologically confirmed to be CSGB. To our knowledge, this is the first CSGB presented from a radiological perspective. A short literature revision of CSGB is provided.