Step 1: Trace the mechanism. Chronic pelvic infection inflames and fibroses the cervix, narrowing or sealing the canal so uterine contents can no longer drain.
Step 2: Identify the result. Pus trapped behind this obstruction collects in the endometrial cavity. That walled-off purulent collection inside the uterus is by definition pyometra, classically seen after long standing PID or secondary to cervical stenosis.
Step 3: Exclude the other choices. Polyposis and cystic endometrial hyperplasia arise from unopposed estrogen stimulation of the endometrium, not from infection plus blockage. Pseudopregnancy reflects a false belief or hormonal mimicry of pregnancy and is unrelated to inflammation.
So the chronic-inflammation plus outflow-obstruction pathway points to one entity.\[\boxed{\text{Pyometra}}\]