<prompt> Most common gallbladder malignancyAdenocarcinomaSquamous cell carcinomaMucinous cystadenomaSerous cystadenoma  <response>: Histological types of gallbladder carcinoma Diffuse infiltrative type : MC type Nodular or mass forming Papillary: Exhibits polypoid or cauliflower appearance and have best prognosis Adenocarcinoma : MC histological subtype of CA GB In CA GB Direct hepatic invasion : 59 Lymph node metastasis : 45 Perineural invasion : 42 Ref: Sabiston 20th edition Pgno :1512-1514 