Review to better understand the macroscopic subtypes and histogenesis of intrahepatic cholangiocarcinoma

Table 3 Radiologic studies of intrahepatic cholangiocarcinoma

Ref.	n	Method	Findings or conclusion
Nanashima et al[25]	42	CT	Factor for poor prognosis: case showing arterial enhancement with lower attenuation
Kim et al[26]	20	MRI	6 (30%) of the 20 cases appeared as hypervascular lesions with washout on delayed phase
Kang et al[27]	50	MRI	Percentage of relative enhancement on hepatobiliary phase was significantly higher in moderately differentiated tumors than in poorly differentiated tumors and in patients without than in those with lymph node metastasis
Xu et al[28]	40	Contrast enhanced ultrasono-graphy	MF-type (n = 32): (1) peripheral rim-like hyperenhancement (n = 19); (2) heterogenous enhancement (n = 10); and (3) homogenous hyperenhancement (n = 3)
Ariizumi et al[29]	26	FDG PET	PI-type (n = 4): heterogenous enhancement (n = 4) IG-type (n = 4): (1) homogenous hyperenhancement (n = 3); and (2) heterogenous enhancement (n = 1) FDG PET was able to predict patient outcome after radioembolization treatment

CT: Computed tomography; MRI: Magnetic resonance imaging; FDG PET: ¹⁸F-fluorodeoxy glucose positron emission tomography.