[Ultrastructural study of the stromal component in urethral caruncle].

The stromal component of the urethral caruncle (UC) comprises a mixture of inflammatory, vascular, and fibrotic phenomena. Although mastocytes are cell elements known to appear in relation with chronic inflammation, there is no data in the literature explaining their significance in UCs or their ultrastructure relation with fibroblasts. We postulate that this special form of intercellular attachment could play a role in this condition's pathogenesis.