Biphenotypic Sinonasal Sarcoma: A Review and Update.

Area of Science:

• Pathology
• Oncology
• Genetics

Background:

• Biphenotypic sinonasal sarcoma (BSNS) is a rare, slow-growing soft tissue sarcoma.
• It typically presents with nonspecific obstructive nasal symptoms.
• Recurrences are common, but metastases are rare, with a low mortality rate.

Purpose of the Study:

• Highlight key diagnostic features of BSNS.
• Compare BSNS to other sinonasal differential diagnoses.
• Summarize clinical features and outcomes of reported BSNS cases.

Main Methods:

• Literature review of recently published studies on BSNS.
• Analysis of morphologic, immunohistochemical, and molecular findings.
• Identification of characteristic PAX3 rearrangements.

Main Results:

• BSNS characteristically demonstrates PAX3 rearrangements with various fusion partners, most commonly MAML3.
• Morphology, immunohistochemistry, and molecular testing are crucial for diagnosis.
• BSNS exhibits a distinct biologic behavior compared to other sinonasal entities.

Conclusions:

• BSNS is an important sinonasal tumor to recognize due to its unique biologic behavior.
• Diagnosis relies on a combination of morphology, immunohistochemistry, and molecular testing for PAX3 rearrangements.
• Accurate diagnosis aids in appropriate patient management and prognosis.