**4. Differential diagnosis of REAHs**

The differential diagnostic of REAHs concerns the inflammatory polyps, Schneiderian papillomas, seromucinous hamartoma, and low-grade non-intestinal adenocarcinoma.

**Figure 5.**

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**Figure 4.**

*nodules of cartilage (in red).*

*Sino-Nasal and Olfactory System Disorders*

*flattened epithelial cells.*

*Seromucinous hamartoma: The mass is covered by respiratory epithelium and is comprised of lobular or haphazard proliferations of small to large glands and ducts which are lined by a single layer of cuboidal or*

*COREAH: Nasal chondromesenchymal hamartoma. Multiple tumor fragments with a mucosal surface and*
