Which region’s imaging exam is associated with a large share of GSD despite only 25% of exams?

• A. Abdomen
• B. Chest
• C. Skull
• D. Pelvis

Answer: (A)

The main idea is about how disease distribution across body regions can differ from how often those regions are imaged. A region can account for a large share of a condition even if it represents only a minority of exams, if diseases in that region are particularly common or yield a high rate of detectable findings on imaging.

Abdominal imaging tends to pick up a wide range of gastrointestinal and retroperitoneal conditions, so it has a high diagnostic yield. Even though abdominal studies may make up about 25% of all imaging exams, they contribute a large share of GSD findings because GI and related pathologies are both prevalent and highly detectable with imaging modalities like ultrasound and CT. In contrast, chest, skull, and pelvis exams, while important, cover fewer broad categories of disease and typically contribute less to the overall share of GSD.