Chronic deciduitis is chronic inflammation of the decidua attached to the basal plate of the placenta.

Histologic features of chronic deciduitis: >= 50 lymphocytes per high field (hpf) in >= 1 hpf


Histologic features of plasma cell deciduitis: >= 5 plasma cells per high power field


The extent of the chronic inflammation can be graded:

(1) focal

(2) multifocal

(3) diffuse


The severity of the inflammation may be designated:

(1) mild

(2) moderate

(3) severe

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