In the article Skeletal Metastases of an Intracranial Malignant Hemangiopericytoma by C. Anderson and C. H. Rorabeck in the January 1980 issue (J. Bone and Joint Surg., Vol. 62-A, pages 145-148), two illustrations were transposed. On page 147, the picture labeled Fig. 5 is Fig. 6; that labeled Fig. 6 is Fig. 5.