Osteosarcomas arising from the cortical surface of bone can be subdivided into parosteal, periosteal, and high grade osteosarcomas, with parosteal osteosarcomas being most well differentiated.1Hang J.F. Chen P.C.H.C. Parosteal steosarcoma.Arch Pathol Lab Med. 2014; 138: 694-699Crossref PubMed Scopus (36) Google Scholar Clinically, show female predominance generally occur in third decade life, d...

OBJECTIVE Osteosarcoma of the bone accounts for approximately 20% of all primary malignant bone tumors. Most cases (75-85%) are high-grade osteosarcomas. We aimed to introduce low-grade osteosarcomas that we found by retrospectively scanning our archives because of the diagnostic difficulties, rarity and different therapeutic approach required. MATERIAL AND METHOD We found 156 osteosarcoma ca...

Bizarre parosteal osteochondromatous proliferation (BPOP) is a benign disorder within a spectrum of reactive proliferative processes of tubular bones, particularly the phalanges of the fingers or toes. The cause is unknown, and it is difficult to distinguish BPOP from a bone or soft tissue tumor. The radiographic and magnetic resonance imaging manifestations of reported BPOP cases are mostly no...

bones of the hands and feet can present a number of diagnostic challenges as both reparative and neoplastic lesions occur at these sites and are similar in clinical presentation, as well as radiologic and pathological appearance. In a review of 240 cases, Ostrowski and Spjut found 203 benign and 37 malignant lesions; 89 of the benign lesions were designated as florid reactive periostitis, bizar...

OBJECTIVE To study and evaluate the unusual findings in the natural history of parosteal osteosarcomas. Parosteal osteosarcomas are well-differentiated tumours of low grade malignancy, but may dedifferentiate into a more aggressive lesion. MATERIAL AND METHODS We reviewed 7 parosteal osteosarcomas treated in La Paz Hospital between 2005 and 2009 (3 were dedifferentiated parosteal osteosarcoma...

Reconstruction after wide resection of a malignant bone tumor can be obtained using several techniques such as the use of prostheses, allograft, autograft, or combined procedure. We describe a 12-year-old girl with parosteal osteosarcoma of the distal right humerus treated by en bloc resection, intraoperative extracorporeal irradiation, and implantation. We inserted a nonvascularised fibular au...

We report the case of a 45-year-old woman who presented with a lump in the mid-third of the left clavicle, which had recently increased in size to 10 cm in diameter. Plain X-ray, computed tomography and bone scans suggested that the lump was a parosteal osteosarcoma. Due to the expected 30% functional loss from claviculectomy [Wood in The results of total claviculectomy. Clin Orthop Relat Res 1...