Oviduct atrophy is an uncommon lesion and would be expected to occur in association with atrophy of the ovary and uterus or with inflammation. Features of oviduct atrophy include a decrease in the cross-sectional diameter of the oviduct, decreased thickness of the smooth muscle wall, decreased epithelial height, and flattened fimbria and/or mucosal folds (Figure 1 and Figure 2). This lesion must be differentiated from hypoplasia.
National Toxicology Program. 1999. NTP TR-481. Toxicology and Carcinogenesis Studies of Oleic Acid Diethanolamine Condensate (CAS No. 93-83-4) in F344/N Rats and B6C3F1 Mice (Dermal Studies). NTP, Research Triangle Park, NC.Abstract: https://ntp.niehs.nih.gov/go/9764