Summary of histological findings in the uterus.

aGrades for extent of tubulogenesis: 0 = none present; 1 = bud formation only; 2 = buds and initial tubules, no branching; 3 = tubules predominant, no branching; 4 = tubules predominant, a few branches present; 5 = branching prominent.bGrades for extent of epithelial subnuclear vacuolization: 0 = No vacuolization present; 1 = Minimal vacuolization (≤10% of cells); 2 = Mild vacuolization (11–25% of cells); 3 = Moderate vacuolization (26–50% of cells); 4 = Marked vacuolization (51–75% of cells); 5 = Severe vacuolization (>75% of cells).