521/572. Aneurysmal bone cyst of the skull. Case report. A case of giant aneurysmal bone cyst of the skull is reported. Treatment was by total excision in three-staged surgery. The patient made a good recovery. ( info) |
522/572. Epiphyseal extension of a unicameral bone cyst. Epiphyseal extension of a unicameral bone cyst is rare. We report a case of a 13-year-old boy with three pathological fractures through a unicameral bone cyst with epiphyseal involvement in the proximal humerus. These lesions initially tends to expand the humeral epiphysis laterally and progress medially. They also commonly cause a slip of the epiphysis in a medical direction. They also have a greater association with growth retardation and lesser degree of recurrence than their metaphyseal counterpart. ( info) |
523/572. Intraosseous ganglion in a 6-year-old boy. The case of a 6-year-old child with an intraosseous ganglion of the distal femur is reported. We believe this is the youngest patient reported with this condition. ( info) |
524/572. Massive proximal femoral osteoarticular allograft. The implantation of massive allografts is a reconstruction alternative after limb salvage for aggressive bone tumours. It is hoped that durable long-term results can be obtained with these biological reconstructions. Revitalization of the allografts is one of the most important factors with regard to durability. One massive proximal femoral osteoarticular allograft is described that was followed up for 22 years. Twenty-one years after the implantation, a traumatic fracture in the middle of the allograft occurred, and formation of massive callus showed that revitalization even in the central parts of massive allografts is sufficient for fracture healing. This is why it may be justified to expect long-lasting results. ( info) |
525/572. Aneurysmal bone cyst of the spine. Long term follow up of three patients with aneurysmal bone cysts has allowed us to draw attention to features which facilitate diagnosis and determine adequate treatment. The lesion occurs usually under the age of twenty with a slight female predominance. Treatment consists in complete local excision. Failing this, curettage should be carried out, and this gives good results. The effectiveness of radiotherapy cannot be assessed from our series, but in our opinion it may not be necessary in every case and should be applied judiciously, as postradiation sarcomas have been reported. Special attention must be paid to the tendency for spontaneous regression and cure after incomplete removal, particularly in recurrent cases, with a view to avoiding more aggressive treatment than is necessary. Multilocation (vertebra and distant bone), endothelial proliferation, and obliteration of the lumen of the small blood vessels support the view that this is a vascular lesion. ( info) |
526/572. Malignant change in an intradiploic epidermoid cyst. We describe a unique case of an intra-diploic epidermoid cyst of the parietal and occipital right bone in a 43 year-old man. The tumor remained quiescent for 12 years and then spontaneously showed malignant changes with intra-cerebral involvement. fatal outcome occurred one year after surgery, radiation therapy and chemotherapy because of a recurrence. Malignant transformation of the epithelium in epidermoid cyst is very rare. Our case is the first one where this transformation occurred spontaneously without previous surgery. ( info) |
527/572. Simple bone cyst of the axis. A 12-year-old girl presented with a 1-month history of posterior neck pain and a large cyst in the second cervical vertebra. She underwent complete curettage of the cyst wall without any kind of bone graft, and the surgical result was good. Microscopic findings in the cyst wall were consistent with simple bone cyst, which is very rare in the spine. ( info) |
528/572. Intraosseous ganglion communicating with soft tissue counterpart. We report the imaging and pathological findings of a rare case of intraosseous ganglion communicating with extraosseous counterpart. Both counterparts contain air and show rim-enhancement on T1-weighted images. Histopathologically, the enhanced-rim consists of reactive proliferation of capillary vessels due to degeneration. ( info) |
529/572. Eccentric simple bone cysts of the femoral neck in adults. The purpose of this communication is to describe atypical simple bone cysts of the femoral neck seen in adult patients. Two patients, aged 56 and 49, having cystic lesions which did not conform to a typical simple bone cyst, are reported. Common features including eccentric location, and thick lining tissue and sclerotic margin are not those of typical simple bone cysts seen in children. Local mechanical characteristics might be related to the atypical presentations. ( info) |
530/572. Aneurysmal bone cyst of clavicle. Two aneurysmal bone cysts are described. They presented difficulties in diagnosis because the patients were rather older than usual for this lesion and because of the uncommon location of the cysts. The nature of aneurysmal bone cysts is discussed. ( info) |