<prompt> Klatskin tumor: RepeatPrimitive neuroectodermal tumor in chestCholangiocarcinoma arising from bifurcation of bile ductLung adenocarcinoma involving apical regionEnterochromaffin cell tumor  <response>: Ans: B Cholangiocarcinoma arising from bifurcation of bile duct Ref: Benbrahim Z et al. Askins tumor: a case report and literature review. World J Surg Oncol. 2013: 11: 10.Explanation:Cholangiocarcinoma arising from bifurcation of bile duct - Klatsin tumorLung adenocarcinoma involving apical region - Pancoast tumorAskin tumors - Primitive neuroectodermal tumors PNET arising from the chest wallOther named TumorsBuschke-Lowenstein tumor-- Giant condyloma acuminatumAckerman tumor - Subtype of Verrucous Carcinoma Carcinoma cuniculatumGrawitz tumor - Renal cell carcinomaKrukenberg tumor - Metastatic secondaries in GIT from an ovarian primaryKuttners stumor - Sialadenitis sialoadenitis - Inflammation of a salivary glandPotts puffy tumor - Frontal osteomyelitis with subperiosteal abscess e:Wilms tumor - Nephroblastoma affecting children 