need help for NCP

what can be the nursing diagnosis for this patient?
chief complaint: difficulty in defecating ( 2 months constipated)
diagnosis: partial gut obstruction secondary to colonic new growth t/c malignant
on general liquid diet
NGT (OF 615 kcal)
weighs 66 kg
male, 73 years old
had colonoscopy, no further surgery, waiting for biopsy of the mass
What do you think it would be? What would be the experiences and risks of a person who hasn't been able to poop well in two months, and is on a full liquid diet while awaiting biopsy results that might tell him he has cancer?

What do you think?Can you show us an example of what you think might be an appropriate diagnosis?