Aneurysmal bone cyst

Aneurysmal bone cyst

Infobox_Disease
Name = PAGENAME



Caption = The ABC is located on the left, on the fifth metatarsal. Notice that the bone appears to be missing on the x-ray.
DiseasesDB =
ICD10 = ICD10|M|85|5|m|80
ICD9 = ICD9|733.22
ICDO =
OMIM =
MedlinePlus =
eMedicineSubj = radio
eMedicineTopic = 26
MeshID = D017824
An aneurysmal bone cyst is an expansile osteolytic lesion with a thin wall, containing blood-filled cystic . The term aneurysmal is derived from its radiographic appearance.

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.

ee also

Giant cell tumor of bone

External links

* [http://bonetumor.org/tumors/pages/page151.html Bonetumor.org]


Wikimedia Foundation. 2010.

См. также в других словарях:

  • aneurysmal bone cyst — a benign, rapidly growing, osteolytic lesion usually occurring in childhood or adolescence; it may be primary or secondary to an existing lesion and is characterized by blood filled, often large, cystic spaces lined by bony or fibrous septa that… …   Medical dictionary

  • bone cyst — ▪ pathology       benign bone tumour that is usually saclike and filled with fluid. Unicameral bone cysts affect the long bones, particularly the humerus and the femur, or heel bones in children and adolescents and are frequently detected as a… …   Universalium

  • Bone cyst, aneurysmal — A benign lesion in a bone that contains connective tissue and blood inside a thin bony shell and that acts like a tumor and expands the bone. Aneurysmal bone cysts typically occur in the second decade of life and can affect any bone in the arms,… …   Medical dictionary

  • Bone disease — Classification and external resources ICD 10 M80 M90 ICD 9 …   Wikipedia

  • Bone tumor — Classification and external resources Micrograph of an osteosarcoma, a malignant primary bone tumor. ICD 10 C …   Wikipedia

  • Cyst — A closed sac or capsule, usually filled with fluid or semisolid material. * * * 1. A bladder. 2. An abnormal sac containing gas, fluid, or a semisolid material, with a membranous lining. SEE ALSO: pseudocyst. [G. kystis, bladder] adventitious c.… …   Medical dictionary

  • Periapical cyst — Classification and external resources CT scan through head showing a right periapical cyst ICD 10 K …   Wikipedia

  • Giant-cell tumor of bone — Classification and external resources Micrograph of a giant cell tumor of bone showing the characteristic giant cells. H E stain …   Wikipedia

  • Giant cell tumor of bone — Giant cell tumor of the bone (also called giant cell myeloma or osteoclastoma) is a relatively uncommon tumor. It is characterized by the presence of multinucleated giant cells (osteoclast like cells). These tumors are generally benign.cite… …   Wikipedia

  • Paget's disease of bone — For other diseases named after Paget, see Paget s disease (disambiguation). Paget s disease of bone Classification and external resources This 92 year old male patient presented for assessment of acute hemiparesis. An incidental finding was… …   Wikipedia


Поделиться ссылкой на выделенное

Прямая ссылка:
Нажмите правой клавишей мыши и выберите «Копировать ссылку»