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Table 3 Omphalocele Aitken classification

From: Omphalocele: a review of common genetic etiologies

ILarger of defect (collar base) < 4 cm
Diameter of the sac < 8 cm
Absence of liver
IICollar base > 5 cm
Diameter of the sac > 8 cm
Presence of the liver in the sac
  1. Type I: all criteria must be present
  2. Type II: presence of one criterion is sufficient