Certified Medical-Surgical Registered Nurse (CMSRN) Practice Exam 2025 - Free CMSRN Practice Questions and Study Guide.

The most common cause of large bowel obstruction is indeed neoplasm. Tumors, particularly malignant ones, can lead to the blockage of the bowel as they grow and can either infiltrate the bowel wall or physically obstruct the lumen. In adults, colorectal cancer is a prevalent source of these obstructions.

While other causes such as adhesions, hernias, and fecal impaction can also lead to bowel obstruction, they are more commonly associated with small bowel obstructions. Adhesions, for instance, primarily result from previous surgeries and can affect both the small and large intestines but are more frequently a cause in the small bowel. Hernias, which can also contribute to obstructions, typically occur in the small intestine as well. Fecal impaction, although it can occur, is more often related to conditions that lead to constipation rather than being a primary cause of large bowel obstructions like neoplasms are. Thus, neoplasm stands out as a significant factor and a common underlying cause of large bowel obstruction in clinical practice.