Solid aneurysmal bone cyst in the humerus.
We report on a 69-year-old woman with a solid variant of aneurysmal bone cyst (solid ABC) in the left humerus with a pathological fracture. Radiographically, the lesion exhibited a relatively well-defined osteolytic lesion in the diaphysis of the left humerus. On magnetic resonance (MR) imaging, the medullary lesion exhibited a homogeneous signal intensity isointense with surrounding normal muscles on the T1-weighted images and a mixture of low and high signal intensity on the T2-weighted images. Contrast-enhanced T1-weighted images revealed diffuse enhancement of the entire lesion. The pathological study showed a proliferation of fibroblasts, histiocytes, chronic inflammatory cells and numerous multinucleated giant cells in a collagenous matrix. Abundant osteoid formation in the matrix was observed, but the cells were devoid of nuclear atypia. Aneurysmal cystic cavities were absent. A review of the English literature found 22 cases of solid ABC of the long bones.
Yamamoto
T
T
Department of Orthopaedic Surgery, Kobe University School of Medicine, Japan.
Marui
T
T
Akisue
T
T
Mizuno
K
K
D000368:Aged; D017824:Bone Cysts, Aneurysmal / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging; D005260:Female; D005598:Fractures, Spontaneous / Q000209:etiology; D006801:Humans; D006811:Humerus / Q000000981:diagnostic imaging / Q000293:injuries / Q000473:pathology; D008279:Magnetic Resonance Imaging; D011859:Radiography