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Intracytoplasmic inclusions in benign prostatic epithelium.

Prostatic glandular tissue in man is associated with varying forms of acellular structures. These include corpora amylacea, as well as more recently described prostatic crystalloids. We describe, for the first time to our knowledge, intracytoplasmic inclusions in benign prostatic epithelial cells of the central and transition zones of the prostate gland. Despite extensive histochemical, immunohistologic, and electron microscopic investigation, the exact nature of these inclusions remains obscure.