Background: To present a case of subconjunctival infestation with Dirofilaria repens which is very rare in Northern Europe.
Methods: A 61-year-old male presented with a swelling and redness of the left supraorbital region migrating to the eyelid and the left eyeball resulting in conjunctival injection, proptosis and diplopia. The patient underwent incisional extraction of a nine cm long worm, which was analysed histologically.