Lasiodiplodia theobromae keratitis – A rare case mimicking Pythium keratitis

A 61-year-old male presented with a corneal ulcer in the right eye and gave a history of trauma with cow-tail 5 days back. The best corrected visual acuity was finger counting at 1 meter, less than n -36 in the right eye. Potassium hydroxide mount revealed broad aseptate filaments. On suspicion of Pythium keratitis, hourly linezolid eyedrop was started but no improvement was seen. The culture grew Lasiodiplodia theobromae , and the ulcer started healing within 2 weeks of starting natamycin 5% eyedrop. This case report highlights the similarities of filaments of Lasiodiplodia and Pythium species on microscopic examination of corneal scraping.