The purpose of this atlas is to provide an illustrated guide to the diagnosis of bone, joint and soft tissue lesions. Although primarily directed towards histopathologists, but will also be of use to physicians, surgeons, radiologists and others involved in the diagnosis and treatment of pathological conditions of bone, joint and soft tissues. As the pathology of bone, joint and soft tissues is commonly dealt with separately in other works, one of the aims of this atlas is to present in a single volume the appearances of the neoplastic as well as the more common non-neoplastic conditions encountered in orthopedic pathology. The photomicrographs in this atlas provide representative appearances of the (often highly variable) morphological features of pathological lesions occurring in bone, joint and soft tissue. Where possible, the pathology is shown at both low-power in order to demonstrate both the overall architecture and cytological detail of the lesion. As examination of gross specimen may provide useful diagnostic information , the macroscopic appearance of some lesions has also been illustrated. The captions which accompany the figures not only describe the histological findings but also, as this often provides essential diagnostic information, the clinical background and radiological features of each lesion.