Pyometra, a purulent infection of the uterus, is a rare cause of a very common complaint-abdominal pain. Risk factors include gynecologic malignancy and postmenopausal status. The classically described presentation includes abdominal pain, fever, and vaginal discharge. In this article, we present an atypical presentation of nonperforated pyometra in an 80-year-old female who was admitted to the internal medicine inpatient service. She initially presented with nonspecific subacute right lower quadrant abdominal pain. Physical examination did not demonstrate vaginal discharge. Laboratory evaluation failed to identify an underlying etiology. Computed tomography scan of the abdomen and pelvis with oral and intravenous contrast demonstrated a 6.5 × 6.1 cm cystic containing structure within the uterine fundus, concerning for a gynecologic malignancy. Pelvis ultrasound confirmed the mass. Endometrial biopsy did not reveal underlying malignancy, but instead showed frank pus, leading to the diagnosis of pyometra. This report illustrates that pyometra should be considered in the differential diagnosis of lower abdominal pain in elderly women.