| Reference | Year | Type of study | Comparison | Level of evidence | Cases (no. of lymph nodes assessed) | Time |
| Rau et al. [28] | 2012 | Prospective comparison | Pre-operative CT vs Intraoperative findings | III-1 | 76 (241) | January 2008-June 2006 |
| Grobmyer et al. [29] | 2006 | Retrospective comparison | Pre-operative CT vs PET vs intraoperative findings | III-2 | 100 (316) | July 2002-June 2004 |