The case of a 75-year-old man with an extramedullary plasmacytoma of the stomach with peculiar histologic aspect is summarized. The cytoplasm of the proliferated cells was full of needle-shaped crystalline inclusions that made it difficult to recognize the plasma-cell nature. Under electron microscope, the crystalline inclusions were localized in the rough endoplasmic reticulum. They have a two internal line system of 75-85 Å of period in a 45 ° angle with the main edge. The laser-ray analysis demonstrates that these two systems delineate hexagonal areas.
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O. Ferrer‐Roca (1982) studied this question.
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