The So-Called Antral Spasm Roentgenologically Considered Hisayuki Masuda 1 1Dept. of Internal Med., School of Medicine Akita University pp.1121-1129
Published Date 1971/8/25
DOI https://doi.org/10.11477/mf.1403111618
  • Abstract
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 Antral spasm is seen in that part of the stomach where the muscularis propriae shows a special structure as in the prepyloric region or the pyloric ring itself bodered on left and right by the canalic loop. Called also as spasmus partis praepyloricae or spasmus canalis pylori, it really is a regional spasm of a segment of the stomach having some extent, not to be confused with pylorospasm, as the latter is only a local spasm. Antral spasm is an abnormality in the musculature engaged in the act of expulsion constituting the chief movement of the prepyloric antrum, so that it is different from peristaltic movement. No real antral spasm can be observed in the antrum between the left muscle ring and the gastric angle where peristalsis does take place. Any spasm in the antrum is therefore only a local one as exemplified in the indentation of the greater curvature seen in gastric ulcer.

 An antral spasm is not always transient, lasting only a few moments. Sometimes it is seen as a local, or an entire and lasting, tetanic contraction of the musclularis propriae. Often it is interpreted as narrowed prepyloric region because this part is kept from sufficient expansion on account of inadequate relaxation following contration of the musculature of the prepyloric antrum, especially of the circular muscle.

 The antral spasm is thus seen most often in chronic gastritis caused by disturbance of the Auerbach's plexus due to inflammatory infiltration into the muscle layers. The antral spasm here described is therefore strictly distinguished from reflectory “antral spasm” caused by peptic ulcer or other diseases of the abdominal organs.

Copyright © 1971, Igaku-Shoin Ltd. All rights reserved.


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