A North Island brown kiwi (Apteryx mantelli) with lameness and weight loss had telangiectatic osteosarcoma. The left proximal tibiotarsus had bony lysis with multiple blood-filled spaces separated by thick fibrous septa and neoplastic mesenchymal cells producing osteoid (5-bromo-4-chloro-3′-indolyl phosphate/nitro blue tetrazolium positive on cytology). No metastases were noted on necropsy.

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