Inadvertent Arterial Injection of 123I-MIBG Does Not Necessarily Cause Any Symptoms.

An 123I-MIBG scan was obtained to evaluate a right adrenal mass in a 10-year-old boy, which showed no elevated activity in the lesion. However, diffuse increased activity was noted in the right forearm with typical manifestation of an "arterial injection." Different from a prior case report, no symptoms or signs related to arterial injection were observed in our patient.