The Rain Artifact: A Newly Described Artifact Encountered in
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We present an ultrasound artifact that we call the rain artifact that has not been previously described in the literature.

Case Summary
A 15-year-old female with no significant past medical history was transferred to the pediatric service with chest pain and cough. With persistent symptoms after conservative management, subsequent work-up, including an echocardiogram, demonstrated a mediastinal mass with compression of the right ventricle. Findings were subsequently confirmed with CT (Figure 1). A biopsy of the mass was requested to confirm the diagnosis. Given her known right heart compression by the mass, it was decided that the biopsy should be per formed in the operating room with general anesthesia and cardiac monitoring via transesophageal echocardiogram (TEE). In the operating room, a transesophageal echocardiogram probe was positioned for cardiac monitoring during the procedure. A C5-1 curvilinear array ultrasound probe (Phillips, Netherlands) was used for the transcutaneous biopsy with a parasternal approach. Initial images were compromised by a discontinuous linear artifact that mimics the appearance of rain (Figure 2).

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