Osteosarcoma arising from osteochondroma of the tibia: case report and cytogenetic findings - Engel, Edgard Eduard; Nogueira-Barbosa, Marcello Henrique; Brassesco, M. S.; Silva, G. E. B.; Valera, Elvis Terci; Peria, Fernanda Maris; Motta, T. C.; Tone, Luiz Gonzaga (Genetics and Molecular Research, 2012)