Mullerian adenosarcoma – a variant of mullerian mixed mesodermal tumor of the uterus - is typically composed of benign but sometimes mildly atypical glandular epithelial elements admixed with malignant sarcomatous stroma. This rare tumor, which accounts for only about 8% of all uterine sarcomas, usually originates in the endometrium and grows as a polypoid mass within the endometrial cavity. The most prevailing presenting symptom is abnormal vaginal bleeding and the most common finding is a poly­poid mass protruding through a dilated cervical canal. The case of a woman, who at age 62 presented with symptoms and signs of acute pelvic inflammatory disease and on vaginal examination an infected mullerian adenosarcoma protruding through a dilated cer­vical canal was discovered, is reported. Treatment consisted of extensive antibiotic treatment and surgery comprised of total abdo­minal hysterectomy and bilateral salpingo-oophorectomy followed by postoperative adjuvant pelvic radiotherapy. One year later, the patient is alive with no evidence of disease.