Possibilities of ultrasonic investigation (USI) in diagnosis of "high" forms of an acute paraproctitis, ischiorectal and pelviorectal one, were studied. Of 20 patients examined, in 14 the diagnosis difficulties were noted, for correction of which the USI method was applied. The presence of purulent formations in pararectal cellular tissue was confirmed, their localization and spread were determined, permitting to substantiate the rational method of surgical intervention choice.
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