PMC4361912_01
Doppler echogram of the left parotid gland. The mass showed a relatively regular border, enhanced back echoes, dissimilar internal echoes, and poor blood flow.
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F1
The blood flow of the mass was examined by Doppler echograms, and the results showed that it was poor (fig. 1).
MRI showed a lobular hypo-isointense mass on T1-weighted images (arrowhead in a), high intensity on T2-weighted images (arrowhead in b), and was well enhanced (arrowhead in c) in the superior part of left parotid gland (arrowhead in d).
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F2
T1-weighted images (fig. 2a, d). The mass was slightly enhanced (fig. 2c), and T2-weighted images showed high intensity in the region (fig. 2b). The mass presented within the parotid gland, and lymphadenopathy was not detected in the examined region.
a SC of the left parotid gland showing lobular nodules in the gland. b SC showing two cell populations of small basophilic cells (arrowhead) and vacuolated cytoplasm (arrow). HE. Original magnification. x100. c SC cells were negative for PAS stains. HE. Original magnification. x400. d SC cells were negative for D-PAS stains. HE. Original magnification. x400. e SC cells were positive for lipids with Oil Red O (HE. Original magnification. x400.
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F3
The mass appeared of a yellow-white color and formed lobular nodules involving the parotid gland (fig. 3a). One had small rounded nuclei with eosinophilic cytoplasm and the other had vacuolar cytoplasm with peripherally located nuclei (fig. 3b). These tumor cells were unable to be stained with periodic acid-Schiff (PAS) stain (fig. 3c) and PAS with diastase (D-PAS) (fig. 3d) but strongly stained with Oil Red O (fig. 3e), which identified the tumor as a SC.