Thecoma : Microscopic Features

Comments:
Thecomas are composed of nodular aggregates or sheets of uniform, plump round to spindle-shaped cells that are arranged in ill-defined fascicles or show vague storiform areas.

They have round to oval nuclei with finely dispersed chromatin, moderate amount of pale vacuolated (lipid-rich) or greyish-pink cytoplasm and indistinct cell membranes creating a syncytial appearance. Punctate nucleoli and nuclear grooves are sometimes present. There is no cytologic atypia, although degenerative-type atypia without increased mitotic activity may be present.