Presentation
Painless swelling of the left parotid region.
Patient Data
There is a well-defined lobulated homogeneous hypoechoic soft tissue mass of the left parotid gland with posterior acoustic enhancement.
The right parotid gland (not shown) was normal.
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The previously described left parotid mass appears lobulated well-defined of low signal on T1, high signal on T2 with progressive homogeneous enhancement on postcontrast dynamic sequence with no restricted diffusion. A peripheral hypointense rim is noted on T2 sequences representing most likely the fibrous capsule.
The TIC (time signal intensity curve) shows a progressive and gradual enhancement of the tumor (TIC type A according to Yabuuchi et al classification).
Conclusion of the histological report
Histological appearances of a pleomorphic adenoma of the parotid gland with no signs of malignancy.
Case Discussion
The ultrasound and MRI appearances are most consistent with a pleomorphic adenoma of the parotid gland (pathologically proven).
Additional contributor: ZE Boudiaf, CHU, Constantine