Aneurysmal Bone Cyst
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http://bonetumor.org/tumors/pages/page151.html
Aneurysmal bone cyst (ABC) is a solitary, expansile and erosive lesion of bone. It is found most commonly during the second decade and the ratio of female to male is 2:1. ABC's can be found in any bone in the body. The most common location is the metaphysis of the lower extremity long bones, more so than the upper extremity. The vertebral bodies or arches of the spine also may be involved.Approximately one-half of lesions in flat bones occur in the pelvis. One theory of the etiology of primary ABCs is that these lesions are secondary to increased venous pressure that leads to hemorrhage which causes osteolysis. This osteolysis can in turn promote more hemorrhage causing amplification of the cyst.
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http://www.emedicine.com/radio/topic26.htm
Introduction Differentials Radiograph CT Scan MRI Ultrasound Nuclear Medicine Angiography Intervention Bibliography
Background: An aneurysmal bone cyst is an expansile osteolytic lesion with a thin wall, containing blood-filled cystic cavities. The term aneurysmal is derived from its radiographic appearance.
Pathophysiology: Trauma is considered an initiating factor in the pathogenesis of some cysts in well-documented cases involving acute fracture. Local hemodynamic alterations related to venous obstruction or arteriovenous fistulae that occur after an injury are important in the pathogenesis of an aneurysmal bone cyst.
Author: Mahesh Kumar Neelala Anand, MBBS, DNB, FRCR, Consulting Staff, Department of Radiology, Pennine Acute Hospitals NHS Trust, Royal Oldham Hospital, Manchester, UK
Coauthor(s): Eric A Wang, MD, Consulting Staff, Department of Radiology, Carolinas Medical Center 2004
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http://www.uhrad.com/msiarc/msi041.htm
Findings: These are three images of the right wrist in a 13 year old female. There is an expansile lytic lesion involving the metaphysis of the distal ulna. The margins are well-defined and there are multiple internal septations. There is no discrete evidence for periostitis.
UHRAD Muskuloskeletal Imaging Teaching Files
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http://www.uhrad.com/msiarc/msi078.htm
Clinical History:12-year-old Hispanic female complaining of a three week history of low back pain radiating to the anterior portion of the left thigh. Pain worsens while walking. Denies fever.
Findings: Large expansile lytic lesion involving the posterior elements of the L3 vertebra. This lesion extends into the posterior 2/3 of the L3 vertebral body with sparing of the anterior aspect. A large expansile component extends into the left paraspinal muscles. The lesion measures 5.0 x 7.5 x 5.6 cm in AP, transverse and craniocaudad dimensions. Fine septations are seen within the expansile portion of the mass. The borders are lobulated with a thin calcific rim. Small flecks of calcification are identified within the lesion. There is mass effect upon the thecal sac.
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http://www.wheelessonline.com/ortho/aneurysmal_bone_cyst
- non-neoplastic expansile lesion consisting of blood filled spaces separated by connective tissue septa containing bone or osteoid and osteoclast giant cells
- etiology unknown
- may be primary or secondary;
- an uncommon expansile osteolytic lesion of bone consisting of a proliferation of vascular tissue that forms a lining around blood filled cystic lesion;
- it develops in metaphyseal region of long bones, pelvis, vertebral posterior elements;
- it commonly involves the proximal humerus, femur, tibia, and pelvis;
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