Author(s)

Nadja Herbach^1*, Christina Terboven², Peter Lambrecht³

¹Center for Clinical Veterinary Medicine, Institute of Veterinary Pathology, LMU Munich, Munich, Germany.
²Equine Veterinary Practice, Warngau, Germany.
³Equine Veterinary Clinic, Zorneding, Germany.

A horse was presented with a slowly growing mass of the distal metatarsal region of the right hind leg. Radiographic examination revealed an eccentric cyst-like lesion with distortion of the lateral margin of the distal metatarsus. The lesion involved approximately half of the metatarsal width, exhibited fine septa, a sclerosed margin towards unaffected bone and a smooth rim of thin compact bone at the periphery. Longitudinal sectioning of the distal metatarsus revealed a solid pale yellow mass with reddish foci and margin. Histologically, the mass consisted of a cell-rich, well vascularized fibrous stroma, containing numerous irregularly shaped trabeculae of woven bone with regular osteocytes. Osteoblasts were observed around the osteoid, and there were foci of numerous osteoclast-like giant cells. The lesion was diagnosed solid variant of an aneurismal bone cyst.

Bone Tumor, Aneurysmal Bone Cyst, Horse

Herbach, N. , Terboven, C. and Lambrecht, P. (2016) Solid Aneurysmal Bone Cyst of the Distal Metatarsus in a Horse. Open Journal of Pathology, 6, 88-92. doi: 10.4236/ojpathology.2016.62011.