1st April 2022

A 68-year-old lady has a past medical history of hypertension, hyperlipidemia, diabetes mellitus and glaucoma

A 68-year-old lady has a past medical history of hypertension, hyperlipidemia, diabetes mellitus and glaucoma. She currently presents with abdominal bloating and pelvic pain of six months duration. This is associated with a loss of appetite and weight. Her menopause was at age 53. She has no family history of cancer and lives alone. A firm, non-tender mass is palpable in the right side of the pelvis. Vaginal and speculum examination found only pale, dry mucosa.

Which ONE of the following investigations is NOT useful in the workup for this patient? Select ONE option only.