PMC3716020_01
Extra-oral frontal view of a 63-year-old male patient, shows facial asymmetry, with a single swelling present in the left parotid region (arrowhead). Extra-oral clinical view of the left side of the face, reveals a single, well-defined, oval shaped swelling, approximately 3 x 4 cm in size, present anterior to the ear (arrowhead).
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F1
On extra-oral examination [Figure 1], a single, well-defined, localized, oval shaped swelling was present in the left preauricular region, measuring approximately 3 x 4 cm in size.
Ultrasonographic image longitudinal view of the left preauricular region shows a well-defined anechoic area measuring 3.3 x 1.9 x 3 cm seen in the superficial part of the left parotid gland.
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F2
Ultrasonography of the left preauricular region [Figure 2] revealed a well-defined anechoic area measuring 3.3 x 1.9 x 3 cm seen in the superficial part of the left parotid gland.
Magnetic resonance imaging: T1-weighted axial image shows a hypointense lesion within the left parotid gland (arrowhead), with a focus of hyperintensity within the lesion.
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F3
Magnetic resonance imaging (MRI), following aspiration, revealed a well-defined cystic lesion seen in the superficial part of the left parotid gland on T1 and T2 weighted sequences measuring 3.5 x 2.0 x 3.2 cm. [Figure 3]. T2-weighted images [Figure 3].
Magnetic resonance imaging: T2-weighted axial image, shows a well-defined cystic lesion of high signal intensity, approximately measuring 3.5 x 2.0 x 3.2 cm, present within the left parotid gland (arrowhead). A focus of hypointensity is seen within the lesion.
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F4
A hypointense lesion with a focus of hyperintensity within the lesion was seen in T1-weighted image [Figure 4].
Hematoxylin and eosin stained specimen at x20 view shows the cyst wall with oncocytic metaplasia (arrowhead).
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F5
Histopathological investigation revealed a cyst wall lined with oncocytes [Figure 5].
Postoperative extra-oral clinical view of the left side of the face shows absence of the swelling in the preauricular region (arrowhead).
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F6
Patient was reviewed after 6 months and there was no evidence of recurrence [Figure 6].