The chief complaint of a 64-year-old woman was persistent, severe constipation for over 5 years. She had no other relevant medical history.

Computed tomography showed a well-defined solid mass measuring 6.4 cm at the right adnexa. Immunohistochemical examination showed immunoreactivity for peptide YY (PYY).

What other investigations would you recommend for this patient?

Reference

1. Noh H, Kwon B, Kim Y et al. Peptide YY producing strumal carcinoid tumor of the ovary in a postmenopausal woman: a rare cause of chronic constipation. Obstetrics & Gynecology Science. 2017;60(6):602. doi:10.5468/ogs.2017.60.6.602.