[Pancreatic pseudocysts (ultrasonic location data and their morphology at different periods of occurrence)]

The work makes parallels between findings of ultrasonic location and the morphology of pancreatic pseudocysts in different periods of their existence. According to results of a histological investigation the pseudocysts can be divided into those being formed (less than 3 months of their existence), formed (more than 3 months of their existence) and isolated ones (after 1-1.5 years). Each period has its peculiar picture of the ultrasonic investigation. The wall of the forming pseudocysts is not dense enough for performing the internal drainage, external drainage having the worst immediate and long-term results. So, the pseudocysts must be operated upon during the 13th-16th weeks of their existence. The isolated pseudocysts are removable, but waiting for this period is not possible because of the probability of extremely dangerous complications.