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Benign glandular inclusions in parotid nerve
1Department of Pathology, Rochester General Hospital, University of Rochester School of Medicine, New York 14621.
American Journal of Clinical Pathology
|August 1, 1988
Summary
Benign salivary structures were found within a nerve near mucoepidermoid carcinoma, showing non-cancerous epithelium can invade nerves. This suggests nerves may actively contribute to these unusual neural-epithelial relationships.
Area of Science:
- Pathology
- Surgical Pathology
- Oncology
Background:
- Perineural invasion (PNI) is a significant prognostic factor in various cancers.
- The exact mechanisms driving PNI, especially when involving benign structures, remain incompletely understood.
- Salivary gland tumors present unique challenges in assessing local invasion patterns.
Observation:
- Benign salivary ductular and acinar structures were identified within an enlarged intraparotid nerve.
- A mucoepidermoid carcinoma was present but did not directly invade the nerve.
- This represents a novel observation of non-cancerous salivary epithelium within neural tissue.
Findings:
- The intraparotid nerve exhibited disorganization and enlargement, suggesting reactive changes.
- The presence of benign salivary elements within the nerve supports a broader definition of PNI.
- Proliferative features in the neural tissue were noted, indicating potential neural involvement.
Implications:
- Salivary gland tissue can be added to the list of tissues exhibiting benign "perineural invasion."
- Neural elements may actively participate in forming these neural-epithelial relationships.
- Nerve growth factor or similar substances might mediate the proliferation and ingrowth of nerve tissue in such cases.