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Published on: January 17, 2018
Intraparotid pseudoglandular schwannoma
1Department of Pathology, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama 230-8501, Japan. ide-f@tsurumi-u.ac.jp
Summary
A rare pseudoglandular schwannoma in the parotid gland was misdiagnosed due to gland-like structures. Immunohistochemistry confirmed these were schwannian cells, highlighting diagnostic challenges with this rare tumor variant.
Area of Science:
- Pathology
- Oncology
- Head and Neck Surgery
Background:
- Schwannomas are typically benign nerve sheath tumors.
- The pseudoglandular variant is exceptionally rare and presents diagnostic challenges.
- Intraparotid locations require careful differentiation from salivary gland pathologies.
Observation:
- A case of a pseudoglandular schwannoma was identified within the parotid gland.
- Initial misinterpretation of gland-like structures as dilated salivary ducts occurred.
- The tumor exhibited multiple well-formed, gland-like spaces.
Findings:
- Immunohistochemistry confirmed the epithelial-appearing cells lining the spaces were of schwannian origin.
- The pseudoglandular architecture was the key feature leading to initial diagnostic confusion.
- Accurate subtyping of schwannoma was initially missed.
Implications:
- This case highlights the importance of considering rare schwannoma variants in intraparotid lesions.
- Recognizing the pseudoglandular morphology is crucial for correct diagnosis and patient management.
- Differential diagnosis of parotid tumors must include nerve sheath neoplasms with unusual presentations.