This 15 y/o female presented with a 3 day history of lower abdominal pain. On exam there was lower abdominal tenderness without rebound, T - 99.2° F, WBC - 9,500 /cc³. Abdominal and pelvic ultrasound exams were normal. A spiral CT with rectal contrast was performed. Selected images shown above demonstrate thickening of the cecal wall secondary to inflammatory changes from appendicitis, forming a so-called "arrowhead" sign. Considering the institutional source of this "sign", it's surprising that a more novel, innovative name wasn't used.

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