A quantitative assessment and classification of the fetal birth tumor according to the original method based on determining the size of the birth tumor by the thickness of the soft tissues between the skin of the head and the bones of the fetal skull in millimeters (mm), determined by vaginal examination. The proposed four degrees of magnitude generic tumour: 0 – no generic tumour; grade I – small (to 10 mm); grade II – intermediate (10–15 mm); grade III– large (over 15 mm). Comparison of generic volume of the tumor and cups vacuum extraction, various modifications. It was established that the volume of the vacuum extractor Cup should exceed the volume of the generic tumor to ensure a sufficient degree of tightness, thereby preventing the failure of the Cup.
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