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Retroocular nodule of a Dirofilaria repens worm detected in a 20-year-old woman, Rostov-na-Donu, Russia. The cyst (arrows) is shown by computed tomography scan (A) and magnetic resonance imaging (B). Ultrasonography images (C) show a worm-like structure inside the cyst (arrow), and color Doppler imaging (D) shows marginal vascularization of the lesion).
