I am postmenopausal, 55 years old, with a history of vaginal spotting, benign ovarian cysts, and bladder infections. Recent laperoscopy, D&C and hystoscopy were normal. Subsequent vaginal bleeding (3 months later). Last week repeated the D&C, hystoscopy and cystoscopy...awaiting results. Informed today that presurgical bloodwork showed a positive result for pregnancy based on HCG levels (unknown level...need to retest). What is the possible cause for bleeding and elevated HCG levels?