Colon cancer: clinical, macroscopic and microscopic aspects.

: Although in developed countries the incidence of colorectal cancer is decreasing through the introduction of well-designed screening systems, the worrying worldwide increase of the mortality rate by colorectal neoplasm indicates the need for a thorough characterization of this pathology. Clinical, endoscopic, histopathological and immunohistochemical data provide important information for creating categories of patients that can benefit from intensive screening methods and for establishing the prognosis based on these data. Approximately 80% of the colorectal cancer develops from adenomas, which shows that early detection of premalignant lesions is an important step in reducing global incidence and mortality. Our study aims at providing information about the clinical, imaging and histopathological characterization of colorectal neoplasm and premalignant lesions. A total of 98 patients were evaluated, including 72 patients diagnosed with colorectal cancer and 26 with premalignant lesions. Patients underwent colonoscopy with biopsy specimens that were examined histopathologically. From the epidemiological data, we observe a higher incidence in men with a men/women ratio of 2/1, with a median age in colorectal cancer patients of 63.93 years. Different data on signs and symptoms were observed according to the colonoscopy location, with a slight difference between symptoms of patients with premalignant lesions compared to those diagnosed with colorectal neoplasm. Endoscopy showed that the rectum was the most frequent location, followed by the left colon, the tumor having a vegetative aspect in most cases. Histopathology confirms that the most common subtype is adenocarcinoma, described in 67 of the studied cases. The moderate differentiation degree is present in more than half of the cases.