Hepatic schwannoma: Imaging findings on CT, MRI and contrast-enhanced ultrasonography

Table 2 Comparison between preoperative imaging and pathological findings

Preoperative imaging technique		Characteristics	Pathology
Dynamic CT		Delayed peripheral subject enhancement	A fibrous capsule
			An internal fibrillary element
T2-weighted MRI		Internal heterogeneous mixed hypo- and hyperintensity	Secondary degeneration such as pseudocystic regression and hemorrhage
FDG-PET		Abnormal uptake	High cellular density (Antoni A area)
Ultrasonography	B mode	Mixed internal septations and solid areas	Division surface showed big and small multilocular cysts
	Vascular phase	Minute blood flows into septum and solid areas	Increased arterial vessel flows associated with infiltration of chronic inflammatory cells
	Postvascular phase	Delayed enhancement of solid areas	Aggregation of siderophores

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