The morphological changes in bitches endometrium affected by Cystic Endometrail Hyperplasia - Pyometra complex – the value of routine histopathological examination

Background: The aim of the analysis was to designate the morphological symptoms that appear during the Cystic Endometrial Hyperplasia - Pyometra complex (CEH-P), diagnosed by microscopic examination. The investigation were conducted on the uteri of 120 bitches in age between 1 – 16. The microscopic examinations were based on histological stainings. The aim of examinations was to find the differences in morphology of endometrium in the specimens of the uteri wall (H&E stain). All of the uteri were divided into three pathological groups (GI – GIII), created on the basis of macroscopic examinations of analyzed diseases. Uteri without macroscopic pathological changes were classified as a control group (C).Results: Histopathological analysis that were conducted have confirmed preliminary macroscopic evaluation for control group with unchanged uteri, group GII with cystic endometrial hyperplasia of uteri (CEH), and group GIII with uteri with pyometra. The confirmation of compatibility of both macroscopic and microscopic evaluation of the uteri were observed in groups GII and GIII. In the uteri of the group GI a severe congestion of endometrium have been observed – it is typical for the inflammation – which was not confirmed during histopathological examinations. Those examinations revealed only endometrial haemorrhage.Conclusions: The results are showing that during classification of research material microscopic examinations are required. The diagnose based on the macroscopic changes in typical for CEH-P symptoms might be incorrect, if it is not supported by detailed research. More than that, in all uteri with the closed pyometra the CEH was also observed. It suggest that pyometra may occur as a consequence of cystic endometrial hyperplasia and bacterial infections ended with inflammation. The results obtained can be used to create a basis for pathologic classification of endometrial hyperplasia and indicate typical morphological changes in endometrium during development of CEH-P complex in bitches.