What do zookeepers do when a 463-lb. (210 kilograms) gorilla develops breathing problems? In the case of Makokou, a 34-year-old male at the Johannesburg Zoo in South Africa, the zoo’s veterinary team flew the great ape to a hospital where he underwent a diagnostic scan using computed X-ray tomography (CT).

Since December 2019, Makokou had suffered from a persistent nasal discharge. Wildlife specialists and veterinarians at the zoo conducted a full examination in May that revealed Makokou had growths in his nasal passages, and a biopsy showed that chronic rhinitis was causing inflammatory polyps that needed to be surgically removed, zoo representatives said in a statement.

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