A 25-year-old woman applied to the gynecology department with complaints of promotion body temperature up to 38.6°C, lower abdominal pain, dysuric disorders. Ill 3 days ago, when these symptoms appeared after an abortion. During gynecological the study revealed: the cervix is cylindrical, the eye is closed. The body of the uterus is somewhat enlarged, painful, soft. Uterine appendages are not palpable. Purulent-bloody discharge. Bythe results of blood tests revealed: leukocytosis with a shift of the blood formula to the left, accelerated ESR. Which diagnosis is most likely?