Infraorbital Dirofilariasis: Conundrum Solved by High-resolution Ultrasound

Human dirofilariasis by nematode worm Dirofilaria repens is an uncommon zoonotic infection presenting most commonly as subcutaneous nodules after mosquito bites. Although the subcutaneous nodules can occur anywhere in the body, orbital and periorbital locations are most commonly involved. Imaging makes the cornerstone of diagnosis in cases with strong clinical suspicion since the nodular subcutaneous swelling has many clinical differentials. We present a case of an 11-year-old boy with infraorbital swelling, which was diagnosed to be dirofilariasis on imaging and postoperative histopathology.