J Korean Soc Radiol.  2013 Dec;69(6):433-436.

Malignant Oncocytoma of the Orbit: A Case Report

• Park WH
• Lee IH
• Song CJ
• Kim DM
• Lee SB
• Kim JM

Abstract

Malignant oncocytoma of the orbit is extremely rare. A 76-year-old man presented with a 10-year history of a mass in the left orbit. Facial computed tomography revealed a large homogeneously enhancing mass. Magnetic resonance images showed a mass with isosignal intensity on a T1-weighted image and low signal intensity on a T2-weighted image. No restricted diffusion was observed on diffusion weighted imaging and apparent diffusion coefficient mapping. The patient underwent an incisional biopsy, and histopathological review revealed a malignant oncocytoma that likely originated in the caruncle of the left eye.

MeSH Terms

Adenoma, Oxyphilic*
Aged
Biopsy
Diffusion
Humans
Magnetic Resonance Imaging
Orbit*
Tomography, X-Ray Computed

Figure

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  Fig. 1 76-year-old man with malignant oncocytoma of the left orbit. A. Non-contrast axial CT scan shows a relatively well-circumscribed, high-attenuated mass (77 HU) in the left orbit. B, C. Contrast-enhanced axial (B) and coronal (C) CT scans demonstrate strong enhancement (140 HU) in the left orbital mass. D. PET-CT scan shows high FDG uptake in the left orbital mass. Note.-FDG = fluorodeoxyglucose, HU = Hounsfield unit, PET = positron emission tomography

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  Fig. 2 The mass shows isosignal intensity on T1WI (A) and low signal intensity on T2WI (B). Note.-WI = weighted image

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  Fig. 3 Histopathologic examination (A and B; hematoxylin and eosin stain, × 100 and × 200) revealed the proliferation of atypical oncocytic neoplastic cells with stromal invasion, which is suggestive of malignant oncocytoma.

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