The number of lymph nodes retrieved after colorectal resection for malignant disease is a quality indicator of pathological examination. However, the conventional method to search for lymph nodes within the resected mesentery is technically difficult and time-consuming. Therefore, a clinical study is planned to investigate the efficacy of new fat dissolution methods in lymph node retrieval after surgery for colorectal cancer. Herein, we introduce the concept of the planned study with summarized methods.