| parosteal osteosarcoma | <tumour> Low grade osteosarcoma arising on the surface of bone without involvement of the underlying marrow, usually occurring as a heavily ossified mass of the distal femur in women in the third and fourth decades of life. (05 Mar 2000) |
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| periosteal osteosarcoma | <tumour> Chondroblastic osteosarcoma occurring on the surface of bones without involvement of the marrow; usually presents in adolescents and young adults as a lucent defect with bone spicules extending into soft tissues. Histologically, the tumour is intermediate to high grade, and the cartilage is lobulated. (05 Mar 2000) |
| infusions, intraosseous | The adminstration of medication or fluid through a needle directly into the bone marrow. The technique is especially useful in the management of paediatric emergencies when intravenous access to the systemic circulation is difficult. (12 Dec 1998) |
| intraosseous | Within bone. Synonym: intraosteal. Origin: intra-+ L. Os, bone (05 Mar 2000) |
| intraosseous anaesthesia | Rarely used method of general anaesthesia by injection of intravenous anaesthetic agent(s) into the medullary canal of long bones. Synonym: intraosseous anaesthesia. (05 Mar 2000) |
| intraosseous fixation | The use of internal metal plates, screws or rods to stabilise bone fragments. A procedure used to correct serious orthopaedic bone fractures that cannot be stabilised by casting or splinting. See: external fixation. (27 Sep 1997) |
| osteosarcoma | <oncology, tumour> Malignant tumour of bone (probably neoplasia of osteocytes). (18 Nov 1997) |
| osteosarcoma, juxtacortical | A form of osteogenic sarcoma of relatively low malignancy, probably arising from the periosteum and initially involving cortical bone and adjacent connective tissue. It occurs in middle-aged as well as young adults and most commonly affects the lower part of the femoral shaft. (12 Dec 1998) |