PMC6008813_01
Magnetic resonance images of parotid oncocytoma. (a) T1-weighted imaging. (b) T2-weighted imaging. An axial magnetic resonance image shows a well-demarcated mass (white arrow) in the superficial and deep lobe of the right parotid gland. (c, d) The mass appears hyperintense to the native parotid gland tissue on fat-saturated T2-weighted imaging but hypointense on contrast-enhanced, fat-saturated T1-weighted imaging. (e, f) On diffusion-weighted images, the mass appeared hyperintense and hypointense according to the apparent diffusion coefficient.
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T1WI with fat saturation. The lesion was hyperintense on axial diffusion-weighted imaging with a b-value of 1000 s/mm2 and a low apparent diffusion coefficient (Figure 1). The lesion was suspected to be Warthin's tumor, and a right superficial parotidectomy was performed accordingly.
Histopathologic findings of parotid clear cell oncocytoma. (a) A well-circumscribed, solid, mahogany-colored nodule. (b, c) Microscopically, fibrous encapsulated nodules containing oncocytic tumor cells with a clear cytoplasm. (hematoxylin-eosin staining; original magnification, 20x in (b) and 400x in (c))
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There was a well-circumscribed, solid, mahogany-colored nodule measuring 3.7 x 2.8 x 2.4 cm in the superficial parotidectomy specimen (Figure 2(a)). These cells formed solid clusters or trabecular patterns, separated by thin strands of fibrovascular stroma (Figure 2(b)) and were round in shape with centrally placed nuclei and clear cytoplasm.
Pulmonary computed tomography demonstrating a right pneumothorax and multiple cysts (arrow). An ellipsoidal cyst abuts on the proximal portion of the pulmonary artery.
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Some of the cysts abutted the proximal portions of the lower pulmonary arteries (Figure 3).