Table 2.

Imaging features of gastrointestinal stromal tumors

	CT	MRI
Primary and metastatic GISTs	Small: Homogeneous mass; Large: Hypervascular, enhancing masses with heterogeneity due to hemorrhage, cystic degeneration, or necrosis	Depend on the amount of hemorrhage, necrosis and cystic degeneration; solid tumor components with low T1 signal, intermediate-to-high T2 signal, and enhancement; low mean ADC values may predict high malignancy potential
Treatment response	Homogeneously hypoattenuating mass with decreased enhancing tumor nodules and intratumoral vessels	Increased T2 signal, increased cystic degeneration of solid tumoral components, increased ADC values
Disease recurrence	Development of enhancing tumor nodules within the treated hypoattenuating tumor	New peripheral thickening and enhancement of cystic tumor

CT: Computed tomography; MRI: Magnetic resonance imaging; GISTs: Gastrointestinal stromal tumors; ADC: Apparent diffusion coefficient.