Differential diagnosis, investigations, and treatment
A positron emission tomography (PET) scan revealed an inoperable left
inguinal lymph node metastasis. PET-CT did not detect any abnormal
accumulation in his lungs, pancreas, or gallbladder. Upper
gastrointestinal endoscopic examination was unremarkable. A presumptive
diagnosis of rectal metastasis of sigmoid colon cancer was made.