Investigation of choice of depth of penetration and nodal stage in rectal carcinoma is
A colonoscopy is required if possible in all patients to exclude a synchronous tumour, be it an adenoma or a carcinoma. If a proximal adenoma is found, it can be conveniently snared and removed the colonoscope. If a synchronous carcinoma is present, the operative strategy will need changing. If a full colonoscopy is not possible, a CT colonography or barium enema can be performed Ref: Bailey & Love&;s Sho Practice of Surgery,E25,Page-1232
CT
MRI
Transrectal USG
Barium meal
G.I.T