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The etiology of ectopic decidual reaction in pregnancy has been supposed to be a variety of factors, such as chorionic gonadotrophic hormone, prolonged progesteronic stimulation or defence mechanism to the chorionic invasions(Nelson & Greene, 1958: Greenblatt & Krafka, 1941), mechanical trauma(Madjerek, 1969), adrenal cortical factor (Bassis, 1956), and effects of cyclic AMP (Leroy, 1974). In order to observe decidual reaction in variable sites, the author used endom etrial tissues obtained from women at late secretory phase, endometrial tissues and ovarian tissues from cases of normal uterine pregnacies and tubal pregnancies, and ovarian tissues from cases showing pseudodeciduosis without pregnancy, then applied several histochemical techniques to those specimens. The follows were ensued: 1. The decidual cells represented similar patterns to routine and special histological techniques in spite of varieties of sites of observation and presence or absence of pregnancy. 2. The decidual cells contained small amount of mucosubstances at the rim of their cytoplasm and they were neutral or acidic in nature. 3. On the ground of the fact that the decidual reactions were found around the blood vessels and they represented similar pattern each other in a variety of organ, the etiologic factor of the ectopic decidua may be ascribed to hormonic effects.
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