Different histological subtypes of parotid gland tumors: CT findings and diagnostic strategy

Figure 1 Computed tomography features of all observed subtypes of parotid gland tumors. A-D: Warthin’s tumors (War-Ts) showing heterogeneous and apparent enhancement; A, B: bilateral multiple lesions with and enlarged lymph nodes; C: Tumors with multiple capsules and vessel facing sign; D: War-T had a large cystic degeneration; E, F: Basal cell adenoma showing apparent heterogeneous enhancement, with multiple low-density areas (E) and multiple capsules (F); G: Pleomorphic adenoma with apparent heterogeneous enhancement at 60 s; H, I: EG presenting unilateral multiple lesions with enlarged lymph nodes, well margin and homogenous enhancement; J: Parotid carcinoma displayed unclear margin and heterogeneous enhancement and involved the superficial and deep lobe.

Figure 2 Time and computed tomography number curve of dual-phase contrast enhanced spiral computed tomography in the observed entities.

Figure 3 Diagnostic strategy of parotid gland tumors. War-T: Warthin’s tumor; PA: Pleomorphic adenoma; BCA: basal cell adenoma; PCa: Parotid carcinoma; KD: Kimura’s disease; HU: Unenhanced-attenuation.

Figure 4 Histopathological features of pleomorphic adenoma, basal cell adenoma, Kimura’s disease and Warthin’s tumor (HE staining, x 400). A: Pleomorphic adenoma are a large amount of myxoid matrix (arrow), rare epithelial components, and low micro vessel count; B, D: Basal cell adenoma and Warthin’s tumor (War-T) respectively, small capillaries and venules are prominent (black arrow). War-T consists of abundant lymphoid interstitial tissue and gland tube sample structures; C: Kimura’s disease demonstrates a lot of eosinophil invasion.