MSRA-2499

A 68-year-old retired teacher visits her primary care physician (PCP) complaining of gradual abdominal swelling that has been present for a few months. She reports experiencing general abdominal tenderness, which is more pronounced in her right flank. Her blood tests reveal normochromic/normocytic anaemia, decreased serum albumin level, and an elevated creatinine level of 170 μmol/l (reference range 35–7 μmol/l). Additionally, her Ca-125 level is elevated. What is the most probable diagnosis?