What is the best next imaging study? (if you are not sure consider consulting a radiologist or taking a peek at the ACR appropriateness criteria: acsearch.acr.org/list)
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In patient's with a palpable mass, an Ultrasound is the first imaging examination of choice in pediatric and pregnant patients. While an adult would likely undergo a CT with intravenous contrast, this would be too much ionizing radiation as the first imaging study.