HISTOPATHOLOGICAL STUDIES ON BOVINE MAMMARY GLAND II. : TISSUE REACTION TO MICROSCOPICAL PSEUDOCONCREMENT

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Neither the nature of microscopical pseudoconcrements nor their genesis were intended for detailed discussion in this paper. If findings pertaining to such problems are required based on microscopical investigation, differences of incidence depending on location need to be clearly describe in a larger number of cases. Authors' direct purpose lay in discussing the various responses of mammary gland tissue to the pseudoconcrement. Therefore, it should not be expected that their discussion would be of assistance in solving the opposite opinions held by E. JOEST and W. STECK, and MCFADYEAN. The present author would like to point out that the cause of different opinions might be traced to neglect in taking into consideration the differences in the materials investigated. While MCFADYEAN selected fairly normal mammary gland as the material for his investigation, JOEST and STECK used the pseudoconcrements in pathological mammary gland for their investigation at least judging from their figures. It is obvious that the results of the present authors' research make it possible for them to say a pseudoconcrement is an endogenous foreign body which normally is proved to be located in the lumen of acinus. In this connection, a problem lies in JOEST and STECK'S research in that the material is limited to the pseudoconcrement which predominates in epithelial layer or stands on the wall of acinus and duct. On the contrary, MCFADYEAN did not seem to pay much attention to the appearance of pseudoconcrement in the tissue regardless of parenchyma and interstitium. It can be interpreted that the opposition in reports of the early authors has resulted from the materials used. The materials of the present investigation are the cases of mastitis circumscripta and mastitis diffusa reported in the first paper. The results of this investigation can be summarized as follows. 1. It can be said without doubt that the pseudoconcrement is produced in the lumen of acinus. 2. Importance should be attached to the histological features of the epithelium which envelops the pseudoconcrement which is proved to be attaching to the wall of acinus and duct, particularly in the lumen of the latter, 3. The pseudoconcrements which occurred in ductal epithelium and were embedded in interstitium show passive tissue reaction. 4. The authors wonder why not they can say that such histological findings can be resulted from the nature of acinar and ductal epithelia, particularly of the latter. The authors are of opinion that the tendency of the characteristics of the epithelial layer in inflammatory mammary gland tissue to envelop and absorb foreign body should be emphasized.
北海道大学の論文
1958-03-25

HISTOPATHOLOGICAL STUDIES ON BOVINE MAMMARY GLAND II. : TISSUE REACTION TO MICROSCOPICAL PSEUDOCONCREMENT

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