Match each patient presentation to the most appropriate next step in diagnostic imaging.
- A 42-year-old female with obesity presenting with acute, postprandial right upper quadrant colicky pain, fever, and a positive Murphy sign on exam.Transabdominal ultrasonography of the right upper quadrant
- A 75-year-old male with persistent atrial fibrillation and severe, acute periumbilical pain that is completely out of proportion to his benign physical examination.Multidetector CT angiogram of the abdomen and pelvis
- A 26-year-old pregnant female at 22 weeks gestation with fever, leukocytosis, and right lower quadrant tenderness, following an indeterminate initial graded compression ultrasound.Non-contrast MRI of the abdomen and pelvis
- A 55-year-old male with a newly discovered solid renal mass with suspected inferior vena cava thrombus, who has a documented anaphylactic reaction to iodinated contrast media.Gadolinium-enhanced MRI of the abdomen
Answer
Match the right upper quadrant pain to ultrasound; the atrial fibrillation patient with disproportionate pain to CT angiogram; the pregnant patient with indeterminate ultrasound to non-contrast MRI; and the patient with a renal mass and iodine allergy to gadolinium-enhanced MRI.
Each imaging modality correctly aligns with established diagnostic algorithms, optimizing for the highest diagnostic yield while strictly adhering to safety constraints such as avoiding radiation in pregnancy and iodine in severe allergies.
Step-by-Step Solution
Key Concept
Optimal selection of imaging modalities requires balancing diagnostic accuracy for the suspected pathology against patient-specific contraindications (such as pregnancy or contrast allergy).