Advanced magnetic resonance imaging findings in salivary gland tumors

Table 1 Evaluation on advance magnetic resonance imaging techniques of salivary gland tumors

	Advance magnetic resonance imaging techniques
	Lymphoma	Warthin’s tumor	Malign tumor	Pleomorphic adenoma
Diffusion weighted ımaging (ADC values)	< 0.8 × 10-3 mm2/s	(0.8-1.0) × 10-3 mm2/s	(1.0-1.2) × 10-3 mm2/s	> 1.2 × 10-3 mm2/s
Dynamic contrast-enhanced MRI	50 s < Tpeak < 90 s, WR < 30%	Tpeak < 50 s, WR ≥ 30%	Tpeak < 120 s, WR < 30%	Tpeak > 120 s, WR: Non-washout
Quantitative dynamic contrast-enhanced perfusion MRI		Ktrans < 0.8 min−1, Kep > 1 min−1, Ve < 0.2	Ktrans < 0.5 min−1, Kep < 1 min−1, Ve > 0.3	Ktrans < 0.3 min−1, Kep < 0.6 min−1, Ve < 0.9

ADC: Apparent diffusion coefficient; MRI: Magnetic resonance imaging; Tpeak: Time to peak; WR: Wash-out ratio; Ktrans: Volume transfer constant between blood plasma and extracellular extravascular space; Kep: Flux rate constant between the extracellular extravascular space and plasma; Ve: Extracellular extravascular space fractional volume.