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20-September-2008 10:21:21 - Aneurysmal bone cyst Aneurysmal bone cyst Classification and external resources The ABC is located on the left, on the fifth metatarsal. Notice that the bone appears to be missing on the x-ray. ICD-10 M85.5 ICD-9 733.22 eMedicine radio/26 MeSH D017824 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. Contents 1 Causes 2 Effects 3 Phases 4 Anatomy 5 Symptoms 6 See also 7 External links Causes Trauma is considered the initiating factor in the development of some cysts, in documented cases involving an acute fracture. Local alterations in the blood flow are related to obstructions that are important in the development of an aneurysmal bone cyst. The lesion generally arises in a pre-existing bone tumor, this is because of the abnormal bones changes in hemodynamics. An aneurysmal bone cyst can arise from a pre-existing chondroblastoma, a chondromyxoid fibroma, an osteoblastoma, a giant cell tumor, or fibrous dysplasia. A giant cell tumor is the most common cause, occurring in 19% to 39% of cases. Less frequently, it results from some malignant tumors, such as osteosarcoma, chondrosarcoma, and hemangioendothelioma. Effects Aneurysmal bone cysts may be intraosseous, staying inside of the bone marrow. Or they may be extraosseous, developing on the surface of the bone, and extending into the marrow. Phases Initial phase of osteolysis. Active growth phase, characterized by destruction of bone tissue. Stable stage, where a formation of a bony shell and internal bony septa produce its soap bubble appearance. Healing phase where the cyst eventually heals into an irregular dense bony mass. Anatomy The tumor can have an occurrence anywhere that there is bone. Approximate percentages by sites are as shown: Skull and mandible 4% Spine 16% Clavicle and ribs 5% Upper extremity 21% Pelvis and sacrum 12% Femur 13% Lower leg 24% Foot 3% Symptoms The afflicted may have relatively small amounts of pain that will quickly increase in severity over a time period of 6-12 weeks. The skin temperature around the bone may increase, a bony swelling may be evident, and movement may be restricted in adjacent joints. Spinal lesions may cause quadriplegia and patients with skull lesions may have headaches. See also Giant cell tumor of bone External links Bonetumor.org v d e Diseases of the musculoskeletal system and connective tissue M, 710-739 Arthropathies Arthritis Septic arthritis - Reactive arthritis - Rheumatoid arthritis - Psoriatic arthritis - Felty syndrome - Juvenile idiopathic arthritis - Still's disease - crystal Gout, Chondrocalcinosis - Osteoarthritis Heberden's node, Bouchard's nodes - Monoarthritis/Polyarthritis Specific joints shoulder Winged scapula - elbow Cubitus valgus, Cubitus varus - hand Wrist drop, Boutonniere deformity, Swan neck deformity hip Protrusio acetabuli, Coxa valga, Coxa vara - leg Foot drop, Flat feet, Club foot, Unequal leg length - patella Luxating patella, Chondromalacia patellae - foot Bunion/hallux valgus, Hallux varus, Hallux rigidus, Hammer toe general terms Valgus deformity, Varus deformity Other Hemarthrosis - Arthralgia - Osteophyte - Hypermobility Systemic CT disorders vasculitis: Arteritis Polyarteritis nodosa, Takayasu's arteritis, Temporal arteritis - arterioles/capillaries Wegener's granulomatosis, Kawasaki disease, Churg-Strauss syndrome, Microscopic polyangiitis hypersensitivity/autoimmune: Hypersensitivity vasculitis - Goodpasture's syndrome - Systemic lupus erythematosus Drug-induced - Dermatomyositis Juvenile dermatomyositis - Polymyositis - Scleroderma - Sjögren's syndrome - Behçet's disease - Polymyalgia rheumatica - Eosinophilic fasciitis Dorsopathies spinal curvature Kyphosis, Lordosis, Scoliosis - Scheuermann's disease - Spondylolysis - Torticollis - Spondylolisthesis Spondylopathies Ankylosing spondylitis, Spondylosis, Spinal stenosis - Schmorl's nodes - Degenerative disc disease - Coccydynia - Back pain Radiculopathy, Neck pain, Sciatica, Low back pain Soft tissue disorders Muscle Myositis Pyomyositis - Myositis ossificans Fibrodysplasia ossificans progressiva Synovium and tendon Synovitis/Tenosynovitis Calcific tendinitis, Stenosing tenosynovitis, Trigger finger, DeQuervain's syndrome - Irritable hip - Ganglion cyst Bursa Bursitis Olecranon, Prepatellar, Trochanteric - Baker's cyst Fascia/fibroblastic Fasciitis Plantar fasciitis, Nodular fasciitis, Necrotizing fasciitis - Dupuytren's contracture - Fibromatosis Shoulder lesions Adhesive capsulitis - Rotator cuff tear - Subacromial bursitis Enthesis Enthesopathies Iliotibial band syndrome, Achilles tendinitis, Patellar tendinitis, Golfer's elbow, Tennis elbow, Metatarsalgia, Bone spur, Tendinitis Other, NEC Muscle weakness - Rheumatism - Myalgia - Neuralgia - Neuritis - Panniculitis - Fibromyalgia Osteopathies disorders of bone density and structure: Osteoporosis - Osteomalacia - continuity of bone Pseudarthrosis, Stress fracture - Monostotic fibrous dysplasia - Skeletal fluorosis - Aneurysmal bone cyst - Hyperostosis - Osteosclerosis Osteomyelitis - Avascular necrosis - Paget's disease of bone - Algoneurodystrophy - Osteolysis - Infantile cortical hyperostosis Chondropathies Juvenile osteochondrosis Legg-Calvé-Perthes syndrome, Osgood-Schlatter disease, Köhler disease, Sever's disease - Osteochondritis - Tietze's syndrome - Relapsing polychondritis See also congenital Retrieved from http://en..org/wiki/Aneurysmal_bone_cyst Categories: Skeletal disorders Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page This page was last modified on 17 July 2008, at 19:37
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