DECIDUAL REACTION IN THE APPENDIX IN INTRA-UTERINE PREGNANCY

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Abstract
One of the most interesting phenomena observed in connection with both normal and ectopic gestation is the occurrence at various locations outside the uterus of tissue having a histologic appearance nearly or quite identical with that of decidua. It has been conclusively shown that the normal, intra-uterine decidua represents nothing more nor less than a transformation of the endometrial stroma, as a result of which the majority of the connective-tissue cells have become much swollen, and have assumed a round, oval or more or less polygonal shape. The cytoplasm often contains vacuoles, probably of glycogen; the nuclei also are somewhat swollen and vesicular, and often occur two or three to a single cell. The cells lie close together, but are separated by fine fibrous trabeculae; scattered among them are usually seen a few small, deeply staining, unchanged connective-tissue cells, the whole structure presenting a very characteristic and, for the most

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