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Case Reports
. 2018 Jun 21:2018:7687951.
doi: 10.1155/2018/7687951. eCollection 2018.

Oncocytoma of the Parotid Gland with Facial Nerve Paralysis

Seijiro Hamada  1 , Keishi Fujiwara  1 , Hiromitsu Hatakeyama  1   2 , Akihiro Homma  1
Affiliations
Case Reports

Oncocytoma of the Parotid Gland with Facial Nerve Paralysis

Seijiro Hamada et al. Case Rep Otolaryngol. .

Abstract

Parotid gland tumor with facial nerve paralysis is strongly suggestive of a malignant tumor. However, several case reports have documented benign tumors of the parotid gland with facial nerve paralysis. Here, we report a case of oncocytoma of the parotid gland with facial nerve paralysis. A 61-year-old male presented with pain in his right parotid gland. Physical examination demonstrated the presence of a right parotid gland tumor and ipsilateral facial nerve paralysis of House-Brackmann (HB) grade III. Due to the facial nerve paralysis, a malignant tumor of the parotid gland was suspected and right parotidectomy was performed. Oncocytoma was confirmed histopathologically. The facial nerve paralysis was resolved 2 months after surgery. During the follow-up period (one and a half years), no recurrence was observed. As the tumor showed a distinctive dumbbell shape and increased somewhat due to inflammation (i.e., infection), the facial nerve was pinched by the enlarged tumor. Ischemia and strangulation of the nerve were considered to be the cause of the facial nerve paralysis associated with the benign tumor in this case.

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Figures

Figure 1
Figure 1
Postcontrast computed tomography (CT) findings. The right parotid gland tumor in scans obtained in our hospital (b) is smaller than that in scans obtained in our affiliated hospital (a).
Figure 2
Figure 2
MR imaging findings. (a) A T1-weighted image showing the tumor to have lower intensity than that of the native parotid tissue. (b) A T2-weighted image showing the tumor to have an intermediate signal intensity and partial hyperintensity.
Figure 3
Figure 3
Intraoperative view of the facial nerve. The buccal branch and marginal mandibular branch can be seen to be compressed by the tumor.
Figure 4
Figure 4
Frozen section of the neoplasm. Clear cells can be seen to form a clear boundary between the normal parotid gland tissues (haematoxylin-eosin, ×100).
See this image and copyright information in PMC

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