Palatal plasmacytoid myoepithelioma

Area of Science:

• Oral pathology
• Surgical pathology
• Oncology

Background:

• Myoepitheliomas are rare benign salivary gland neoplasms originating from myoepithelial cells.
• They constitute less than 1% of all salivary gland tumors and exhibit diverse histological subtypes.
• Plasmacytoid myoepithelioma, particularly in palatal salivary glands, is an exceptionally rare variant.

Observation:

• A 45-year-old female presented with a gradually enlarging, asymptomatic, well-circumscribed mass on the hard palate.
• Initial clinical diagnosis suggested Pleomorphic Adenoma.
• Histopathological examination revealed sheets of large, homogenous cells with plasmacytoid features and eosinophilic cytoplasm, lacking ductal or acinar differentiation.

Findings:

• The histopathological findings were inconsistent with Pleomorphic Adenoma.
• The observed features strongly supported the diagnosis of plasmacytoid myoepithelioma.
• Absence of ductal and acinar differentiation was a key diagnostic criterion.

Implications:

• This case highlights the importance of thorough histopathological evaluation for accurate diagnosis of rare salivary gland tumors.
• Distinguishing plasmacytoid myoepithelioma from other benign salivary neoplasms is crucial for appropriate management.
• Further research into the specific characteristics and behavior of palatal plasmacytoid myoepitheliomas may be warranted.