Juvenile nasopharyngeal angiofibroma: an immunohistochemical characterisation of the stromal cell

The majority of stromal cells have an undiffer-entiated immunophenotype with no evidence of epithelial, myoid, endothelial or other lineage specific differentiation. In the microvascular component the stromal cells appear able to show smooth muscle or endothelial differentiation. No c-kit expression was identified.