J Korean Acad Oral Maxillofac Radiol.  1997 Feb;27(1):231-242.

A case repore of aneurysmal bone cyst of the mandibular condyle

• Ko JH
• Lee SS
• Choi SC
• Park TW
• You DS

Abstract

The aneurysmal bone cyst is a nonmalignat reactive bone lesion. Developing rarely in the craniofacial region, and more commonly affecting the long bones and the spine, the lesion has variable etiopathogenic characteristics. The author s diagnosed a 33-year-old female as aneurysmal bone cyst after undergoning clinical, radiological and histological exami nations. The characteristics were as followed: 1. The patient complained of pain and swelling of the right preauricular area. 2. The conventional radiograms showed a relatively well difined radiolucent lesion with partially scallping margin. The cortical bone of the right condyle was thinned and expanded by the lesion. 3. Bone scintigraphy with (99m)Tc demonstrated ring-like or doughnut-pattern accumulation of radioactivity. 4. On T1-weighted imaging of MRI, the lesion on the right condyle had middle signal intensity. T2-weighted MRI demonstr ated multiple high signal intensities seperated by septa which had low signal intensity. Finger in balloon appearance wa s seen. 5. Histologically, the lesion was composed of large sinusoidal blood spaces lined by fibroblasts and histiocytes. Its fibrous stroma consisted of fibroblastic element, multinucleated giant cells, extravasated erythrocytes and focal hemosid erin pigmentation. New bone formation was also observed aroud larger sinusoidal spaces.

MeSH Terms

Adult
Aneurysm*
Bone Cysts*
Erythrocytes
Female
Fibroblasts
Fingers
Giant Cells
Histiocytes
Humans
Magnetic Resonance Imaging
Mandibular Condyle*
Osteogenesis
Pigmentation
Radioactivity
Radionuclide Imaging
Spine