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AJNR - American Journal of Neuroradiology

Published ahead of print on May 8, 2008
doi: 10.3174/ajnr.A1109

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Myoepithelioma of the Parotid Gland: CT Imaging Findings

S. Wang^a, H. Shi^a, L. Wang^b and Q. Yu^a

^a Departments of Radiology, Ninth People's Hospital, Medical School, Shanghai Jiao Tong University, Shanghai, People's Republic of China
^b Pathology, Ninth People's Hospital, Medical School, Shanghai Jiao Tong University, Shanghai, People's Republic of China

View larger version (149K): [in this window] [in a new window]   Fig 1. A 62-year-old woman with ME. A, Precontrast axial CT scan shows a round, well-defined mass (27.39 HU) in the superficial lobe of the right parotid gland abutting on the capsule of gland (arrow). B, Contrast-enhanced axial CT scan shows the mass (102.11 HU) with homogeneous strong enhancement (arrow). C, Microscopic examination (hematoxylin-eosin stain [HE]; x2) shows that the ME (M) is separated from the parotid gland and the surrounding soft tissues by a fibrous capsule (FC). The stroma is scanty. D, Microscopic examination (HE; x100) shows that the tumor is composed of the plasmacytoid and spindle cells. Relatively large vessels are seen in the tumor (arrows).

View larger version (154K): [in this window] [in a new window]   Fig 2. A 66-year-old woman with ME. A, Precontrast axial CT scan shows an indistinct margin mass in the superficial lobe of the left parotid gland abutting on the capsule of the gland with calcification (arrow). B, Contrast-enhanced axial CT scan shows the mass with inhomogeneous enhancement. It contains a central enhancing nodule (small black arrow) and a nonenhancing peripheral cystic component (white arrow). C, Microscopic examination (HE; x10) shows the epithelioid nest (arrow) with a lot of vessels and a cystic component in the center (black asterisk). D, Microscopic examination (HE; x20) shows the inflamed cells (long arrows) and the tumor cells (short arrow).

View larger version (64K): [in this window] [in a new window]   Fig 3. A 56-year-old woman with ME. A, Contrast-enhanced multiplanar reformatted coronal CT scan shows a well-defined mass in the tail of the right parotid gland with inhomogeneous enhancement (white arrow). Note the slitlike-shaped nonenhancing area (small black arrow). B, Microscopic examination (HE; x40) shows that there are hemorrhage (stars) and tumor cells (arrow) in the stroma.

View larger version (142K): [in this window] [in a new window]   Fig 4. A 54-year-old man with ME. A, Precontrast axial CT scan shows a well-defined mass with a lobulated margin in the superficial lobe of the right parotid gland abutted on the capsule of the gland (arrow). B, Contrast-enhanced axial CT scan shows the mass with inhomogeneous enhancement. It contains enhancing nodules (arrows) and nonenhancing linear band (arrowheads). C, Microscopic examination (HE; x2) shows the stroma (black asterisks) and epithelioid nests (arrows) with a lot of vessels. D, Microscopic examination (HE; x100) shows that the nest is composed of plasmacytoid.