Cranio-facial tumours of mixed cartilage and bone in koalas (Phascolarctos cinereus)

Cranio-facial tumours of mixed cartilage and bone are discussed in 4 koalas. The tumours were well circumscribed and distorted the faces of the koalas. Grossly, the tumours were firm, white and nodular. Histologically, they consisted of compartments separated by connective tissue septa. The compartments were lined by cells resembling chondroblasts, and had varying amounts of bone and hypertrophied chondrocytes in their centres. The neoplasms were considered benign.