FIG. 1.

Examples of low-grade and high-grade endometrial endometrioid carcinomas (EEC): (A) low-grade EEC [International Federation of Gynecology and Obstetrics (FIGO) grade 1) with extensive squamous differentiation that does not qualify as “solid” for the purposes of grading; (B) low-grade EEC (FIGO grade 2) with <50% solid nonsquamous growth; (C) low-grade EEC (FIGO grade 2) with <50% solid nonsquamous growth; and (D) high-grade EEC with a microacinar growth pattern that qualifies as “solid growth.” The presence of microacini should not be considered “glandular” for the purposes of assigning binary or FIGO grade.