Primary Umbilical Neoplasm Demonstrated on FDG PET/CT

Abstract

Primary umbilical neoplasm is very rare, even though there are scattered case reports about the umbilical metastases known as Sister Mary Joseph's nodules. A 51-year-old man presented with an umbilical mass. Surgical biopsy showed infiltrating neoplasm with glandular and focal papillary architecture. FDG PET/CT demonstrated a focus of abnormal uptake located in the umbilicus, without evidence of a primary tumor elsewhere. Further investigations with EGD, colonoscopy, and cystoscopy were all negative for a neoplasm. The whole-body FDG PET/CT is an ideal imaging modality for evaluation of an umbilical lesion, especially identification or exclusion of a primary neoplasm elsewhere.