Sinonasal mucosal vasculature in yellow nail syndrome and chronic rhinosinusitis with or without polyps.

This is the first histological analysis of sinus mucosa in patients with YNS. Vascular type, density, size, and distribution in the sinonasal mucosa of YNS patients are not statistically significantly different from those of the CRSsNP group. Lymphatic density and ratio to total vasculature is higher in CRSwNP patients.