Chronic Deciduitis Watchlist (log in to enable) Retrieved 2021-01-18 Source Wikipedia Trials — Genes — Drugs — Interested in hearing about new therapies? Registered! Chronic deciduitis is a type of long-lasting inflammation that arises in pregnancy and affects the endometrial stromal tissue (decidua). It is associated with preterm labour. The diagnosis rests primarily on the presence of plasma cells. Intermed. mag. High mag. See also Chorioamnionitis Decidua