[Primary sacral tumors: analysis of results and complications].

Introduction: Primary sacral tumors are rare, treatment in most cases is surgical with or without adjuvant radiotherapy; oncology and functional results are usually adverse with a high rate of complications.

Material And Methods: We conducted a retrospective, analytical and observational studies that includes 22 cases treated between 2000 and 2017, analyzed their characteristics demographic, the type of treatment received, and the oncological, functional results and the rate of complications were analized.

Results: 22 patients were subjected to sacrectomy with posterior approah because of cordoma (13 patients), giant cell tumour (three patients) and other (six patients).

[Dedifferentiated diaphyseal juxtacortical osteosarcoma of ulna with metastasis to the lung].

Dedifferentiated parosteal osteosarcoma is a variant in which a high grade osteosarcoma coexists with a parosteal osteosarcoma. We report the case of a 20-year-old female patient who presented with six months of evolution of pain and functional limitation of the right forearm, with no apparent cause; radiographs were performed, observing a tumoral lesion in the diaphysis of the right ulna. Physical examination showed pain upon palpation in the diaphysis of the ulna and limitation of prone-supination.

Local flaps, including pedicled perforator flaps: anatomy, technique, and applications.

Learning Objectives: After reading this article, the participant should be able to: 1. Discuss the types of local flaps. 2.