CTICasesSubcutaneous Identification Microchip
Imaging findings
Chest radiograph of a 14-year-old canine (dog) demonstrates a left upper lung consolidative mass (lung cancer) and a small, linear, and metallic-density foreign body in the subcutaneous tissues of the left shoulder. The metallic density corresponds to an implanted identification microchip, which does not communicate with the airway.
Key takeaways
Subcutaneous identification microchips are routinely implanted in companion animals (such as dogs and cats) in the scruff or shoulder region. On radiographs, these microchips appear as distinct, linear, metallic structures that can mimic ingested/aspirated foreign bodies or medical devices. Correct anatomical localization to the subcutaneous tissues on lateral views prevents diagnostic confusion.
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