Interobserver reliability in the histopathological diagnosis of cartilaginous tumors in patients with multiple osteochondromas. by de Andrea, C, Kroon, H, Wolterbeek, R, Romeo, S, Rosenberg, A, De Young, B, Liegl, B, Inwards, C, Hauben, E, McCarthy, E, Idoate, M, Athanasou, N, Jones, K, Hogendoorn, P, Bovée, J