Advanced magnetic resonance imaging findings in salivary gland tumors

Figure 1 Twenty-nine years old male patient with smooth lobule contoured pleomorphic adenoma located on the superficial lobe of right parotid gland. A: The lesion contains prominent hyperintense components and mixed signals on T2-weighted image; B: The lesion contains heterogeneous hypointense signal on T1-weighted image; C: The lesion appears to have marked heterogeneous enhancement on the contrast-enhanced image; D: The apparent diffusion coefficient (ADC) value of mass was 1.58 × 10^-3 mm²/s on ADC map; E: Hypo-hyper perfused areas on perfusion magnetic resonance imaging color map; F: The time intensity curve of mass is seen increasing contrast-enhancement towards late phases.

Figure 2 Sixty-five years old male patient with smooth lobule contoured Warthin’s tumor located on the superficial lobe of right parotid gland. A and B: Hypointense signal of the lesion compared to the gland on T2-weighted image and T1-weighted image; C: The mass is hyperperfused on the color-coded perfusion image; D: The mass appears to be slightly heterogenous hyperintense on the diffusion-weighted image, E: The apparent diffusion coefficient (ADC) value of mass was 0.74 × 10^-3 mm²/s on the ADC map; F: The time intensity curve of mass has a wash-out ratio of 50%.

Figure 3 Fourty-four years old female patient with adenoid cystic carcinoma infiltrating into the left maxiller sinus. A: T2-weighted image shows a hyperintense mass in the left maxillary sinus; B: T1-weighted image shows a hypointense mass in the left maxillary sinus; C: The apparent diffusion coefficient (ADC) value of mass was 1.19 × 10^-3 mm²/s on the ADC map; D: There was intense contrast enhancement on the contrast-enhanced image of the mass; E: On the color-coded perfusion magnetic resonance imaging, hyper and hypoperfused areas are seen in the mass; F: On the time intensity curve of mass, progressive enhancement is seen towards the late phases.

Figure 4 Sixty-one years old male patient with non-Hodgkin lymphoma infiltrating into the right parotid gland. A and B: Hypointense signal of the lesion compared to the gland on T2-weighted image and T1-weighted image; C: Contrast enhancement components of different intensities are seen on contrast-enhanced image in the lesion; D: The apparent diffusion coefficient (ADC) value of mass was 0.55 × 10^-3 mm²/s on the ADC map; E: The mass is hyperperfused on the color-coded perfusion image; F: The time intensity curve of mass has a wash-out ratio of 43%.

Figure 5 Eighty-seven years old female patient with squamous cell carcinoma infiltrating into the left parotid gland. A: T2-weighted image shows a mass with a large cystic component; B: The lesion is hypointense on T1-weighted image; C: Solid component of the mass appears to be slightly hyperintens on the diffusion-weighted image; D: The apparent diffusion coefficient (ADC) value of the solid component of mass was 1.05 × 10^-3 mm²/sec on the ADC; E: There was intense contrast enhancement of the solid component of mass on the contrast-enhanced image; F: On the color-coded perfusion magnetic resonance imaging, hyperperfused areas are seen in the solid component of the mass; G: On the time intensity curve of mass, progressive enhancement is seen towards the late phases. H: Ktrans was measured on quantitative dynamic contrast-enhanced magnetic resonance imaging.