RESUMO
Many different options of neoadjuvant treatments for advanced colon cancer are emerging. An accurate preoperative staging is crucial to select the most appropriate treatment option. A retrospective study was carried out on a national series of operated patients with T4 tumors. Considering the anatomo-pathological analysis of the surgical specimen as the gold standard, a diagnostic accuracy study was carried out on the variables T and N staging and the presence of peritoneal metastases (M1c). The parameters calculated were sensitivity, specificity, positive and negative predictive values, and positive and negative likelihood ratios, as well as the overall accuracy. A total of 50 centers participated in the study in which 1950 patients were analyzed. The sensitivity of CT for correct staging of T4 colon tumors was 57%. Regarding N staging, the overall accuracy was 63%, with a sensitivity of 64% and a specificity of 62%; however, the positive and negative likelihood ratios were 1.7 and 0.58, respectively. For the diagnosis of peritoneal metastases, the accuracy was 94.8%, with a sensitivity of 40% and specificity of 98%; in the case of peritoneal metastases, the positive and negative likelihood ratios were 24.4 and 0.61, respectively. The diagnostic accuracy of CT in the setting of advanced colon cancer still has some shortcomings for accurate diagnosis of stage T4, correct classification of lymph nodes, and preoperative detection of peritoneal metastases.
RESUMO
A 65-year-old patient with a history of ischemic stroke, residual ophthalmoparesis, positive fecal occult blood screening and pending colonoscopy attended the Emergency Room due to three days with pain, abdominal distension and diarrhea. In the Emergency Room, he presented diffuse abdominal pain, hemodynamic instability with acute renal failure and metabolic acidosis, with severe elevation of acute phase reactants. Abdominal fluid resuscitation and computed tomography (CT) were performed, which reported a dilatation of the loops of the small intestine to the distal ileum with thickening of the wall of the right colon and gas, dissecting intrahepatic portal branches and splanchnic veins.