Crystalloid inclusions were observed within nongranulated, folliculostellate pituitary cells 72 after estrogen was withdrawn from primed male rats. Like crystalloid inclusions in macrophages reported by others, those observed in this study were associated with structures that appeared to be lysosomes. We suggest that crystalloid inclusions may be the result of phagocytosis, a function of folliculostellate cells proposed by us in a previous study.
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