Fistula etiology is best described by which statement?

• A. Surgically created
• B. Body fluids follow the path of least resistance
• C. Dietary deficiency
• D. Spontaneous result of injury or pathology

Answer: (D)

Fistula formation arises from an underlying injury or disease that creates a persistent tract between two structures. Because of this, describing fistula etiology as a spontaneous result of injury or pathology best captures the cause: it emphasizes that the abnormal connection develops due to disease processes, trauma, or inflammation rather than being something intentionally created.

For context, fistulas can be iatrogenic when surgically created for treatment, but that describes a deliberate procedure rather than the typical etiologic origin. Dietary deficiency doesn’t cause fistulas, and while fluids may track along a path of least resistance once a tract exists, that describes a mechanism of tract formation, not the root cause.