Korean J Radiol.  2009 Aug;10(4):398-401. 10.3348/kjr.2009.10.4.398.

Myopericytoma Involving the Parotid Gland as Depicted on Multidetector CT

• Chu ZG
• Yu JQ
• Yang ZG
• Zhu ZY
• Yuan HM

• KMID: 1777269
• DOI: http://doi.org/10.3348/kjr.2009.10.4.398

Abstract

Myopericytoma is a newly proposed subgroup of perivascular tumors in the World Health Organization classification of soft tissue tumors. In this study, we report a case of a benign myopericytoma with detailed multidetector CT (MDCT) findings in the parotid gland, a location that has not been described for this type of tumor previously. The clinical presentation, imaging features, histopathological and immunohistochemical findings, and the differential diagnosis with other tumors in the parotid gland are described and reviewed.

Keyword

Myopericytoma; Parotid gland; Radiograph, CT

MeSH Terms

Adult
Diagnosis, Differential
Female
Humans
Immunohistochemistry
Parotid Neoplasms/pathology/*radiography
Soft Tissue Neoplasms/pathology/*radiography
Tomography, X-Ray Computed/*methods

Figure

• 

  Fig. 1 Myopericytoma in parotid gland in 41-year-old woman. A. Unenhanced CT scan shows 5-cm round mass with lower central density and poorly defined margin in superficial lobe of right parotid gland (white arrow). Also note enlarged lymph nodes (arrowheads). B. Contrast-enhanced CT scan shows peripheral enhancement (white arrow) and irregular central non-enhanced attenuation of mass. Multiple reactive lymph nodes with similar CT features are also demonstrated in subcutaneous fat of right cheek and parapharyngeal spaces (arrowheads). C. Resected specimen contains encapsulated, tan-colored tumor mass (straight arrow) surrounded by parotid glandular tissue (curved arrow). D, E. Photomicrograph of histology specimen shows numerous thin-walled vessels surrounded concentrically by proliferative spindle-shaped to oval-shaped myoid tumor cells in peripheral zone, as well as hyaline degeneration (E in black asterisks) in central zone (Hematoxylin & Eosin staining, original magnification, ×200). F. Immunohistochemical staining shows positive reactivity for smooth muscle actin in tumor cells smooth muscle actin marker (original magnification, ×400).

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