A 38-year-old woman comes to the physician

because of a 6-month history of heavy, irregular menstrual bleeding. The sample

of endometrium shows corkscrew tubular glands with an irregular lumen lined by

tall columnar epithelial cells. The lumina are dilated and full of secretory

products. The stroma is edematous. Which stage of the menstrual cycle is the

endometrium probably at?