The document details the medical history and examinations of a 63-year-old female patient who presented with chronic diarrhea, suspected malignancy, and other complications, including right pleural effusion and hyponatremia. Multiple diagnostic imaging results indicate a malignant mass in the pelvic cavity, impacting adjacent organs, accompanied by laboratory findings showing anemia and impaired renal function. Despite ongoing treatment and monitoring, the patient's condition deteriorated, leading to severe illness and complications.