Lipomas may be defined as benign lesions of mature adipose tissue without evidence of cellular atypia. Lipomas are the most common soft tissue lesions and surprisingly are among the rarest bone neoplasias. Osseous lipomas have been classified according to their site of origin: either within bone (intraosseus) or on its surface (juxtacortical). Surface osseous lipomas are subdivided into paroste...

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...

We report the case of a parosteal osteosarcoma of the distal ulna, treated with wide resection without reconstruction. The patient developed lung metastasis and a mass in the interosseus membrane of the forearm proximally to the osteotomy. The lung mass was found to be a metastasis from parosteal osteosarcoma and the biopsy of the forearm mass revealed a myositis ossificans. The suspicion of a ...

The incidence of aneurysmal bone cysts is 0.14 cases per 100,000 individuals. Parosteal aneurysmal bone cysts are the least prevalent subtype and represent 7% of all aneurysmal bone cysts. We present the case of a 38-year-old male patient with pain and bulging in his right arm for eight months. He had previously been diagnosed as presenting giant-cell tumor, but his slides were reviewed and his...

Parosteal lipoma is a rare tumor, accounting for approximately 0.3% of all lipomas. Bony lesions are often found in patients with this tumor (59.2%), making the differential diagnosis of malignant tumors important. Our case was a 64-year-old male patient who complained of a 25 × 15-cm mass on his right thigh that had grown rapidly over a 2-month period. On magnetic resonance imaging, a high-int...

CASE REPORT A 49 year-old female presented with a mass the size of a large grapefruit in the right gleno-humeral region. She described a constant ache from the lesion which had been present for about three months. There was some limitation of movement at the shoulder joint. There was no evidence of inflammation or lymphadenopathy. X-ray showed a large low density soft tissue mass in keeping wit...