Angiolymphoid hyperplasia with follicular mucinosis.

Follicular mucinosis is described to our knowledge for the first time in angiolymphoid hyperplasia. In general, follicular mucinosis may be regarded as a peculiar, nonspecific histological reaction pattern in follicular epithelium that may occur on its own or in association with other pathological processes, particularly lymphomas. The unusual and characteristic features of angiolymphoid hyperplasia revealed by electron microscopy are irregular vessels lined by atypical endothelial cells with convoluted nuclei and large cytoplasmic vacuoles.