Clinical history: 0.7 cm rectal polyp in 50 year old male.
What is the most proable diagnosis?
Well-differentiated Neuroendocrine tumour
10-20% of all gastrointestinal neuroendocrine tumours are in rectum. They are mostly seen in middle-aged to older adults. They are mostly asymptomatic and may be seen as polyps on routine endoscopy. However pain and rectal bleeding is possible (due to mechanical injury by solid stool). In this case, Ki-67 index was 8% that represented histologic grade of G2. Based on 7th edition of TNM staging, this tumour was staged as a pT1a tumour.