Collision tumor of primary malignant lymphoma and adenocarcinoma in the colon diagnosed by molecular pathology: A case report and literature review

Figure 1 Macroscopic examination. The resected specimen presented as a circumferential ulcerative mass on the cecal mucosa adjacent to the ileocecal valve. The mass appeared to be comprised of two tumors. The upper-right portion of the mass had a crater-like appearance with a necrotic-appearing central area (orange arrow), whereas the remaining part of the mass had a polypoid, hard and grayish-white aspect (black arrow).