Sinonasal Hamartomas

Area of Science:

• Otorhinolaryngology
• Pathology
• Oncology

Background:

• Sinonasal hamartomas encompass diverse lesions, including respiratory epithelial adenomatoid hamartoma (REAH), seromucinous hamartoma (SH), and nasal chondromesenchymal hamartoma (NCMH).
• REAH and SH exhibit considerable morphologic overlap with each other and with reactive lesions, complicating diagnosis.
• NCMH is distinct, affecting a specific patient group with a known molecular driver.

Purpose of the Study:

• To clarify the classification and diagnostic challenges of sinonasal hamartomatous lesions.
• To discuss the debated neoplastic versus hamartomatous nature of REAH and SH.
• To highlight emerging sinonasal hamartomatous entities related to REAH and SH.

Main Methods:

• Literature review of sinonasal hamartomatous lesions.
• Comparative morphologic analysis of REAH, SH, and NCMH.
• Discussion of diagnostic criteria and molecular findings.

Main Results:

• REAH and SH show significant overlap, posing diagnostic difficulties and often appearing alongside other tumors.
• The hamartomatous or neoplastic classification of REAH and SH remains under debate.
• New sinonasal hamartomatous entities with potential links to REAH and SH are emerging.

Conclusions:

• Accurate diagnosis of sinonasal hamartomas requires careful consideration of morphologic features and clinical context.
• Further research is needed to definitively classify REAH and SH and understand emerging related entities.
• Distinguishing these lesions is crucial for appropriate patient management and treatment strategies.