Neurochirurgie
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Lumbar disc herniation (LDH) at the level of non-displaced spondylolysis (isthmic spondylolisthesis) is an uncommon association rarely evaluated in the literature. In this study, authors examine whether the continuous posterior epidural fat between the dura mater and spinous process (continuous double-hump sign) at the level of LDH is a valuable tool to identify patients with non-displaced spondylolysis on MRI. ⋯ Non-displaced spondylolysis may be associated with adjacent LDH. Although uncommon, it is important for neurosurgeons to be aware of this association because of its implication on the therapeutical management. MRI is not always sufficient to recognize a non-displaced spondylolysis with certainty; however "continuous double-hump sign" may be used as a simple valuable diagnosis tool.
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Review Case Reports
Modified posterior atlantoaxial screw-rod fixation in a case of persistent first intersegmental artery. Case report and literature review.
This case reports atlantoaxial stabilization in case of V3 segment anomaly. ⋯ This rare vascular anomaly described in 2 to 5% of the patients led us to modify the screw entrance over the C1 posterior arch in order to obtain a satisfactory stabilization and to limit the risk of vertebral artery injury.
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Review Case Reports
[Epidermoid cyst of the cisterna magna and the fourth ventricle: Report of four cases].
Epidermoid cyst is a congenital and benign tumor, developed from ectodermal inclusion. These cysts occur very rarely in the cisterna magna and the fourth ventricle. ⋯ Epidermoid cysts are characterized by a long evolution. The diagnosis is relatively characteristic in the imagery. The prognosis was favourable with a complete surgical resection.
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Different prosthesis implants are offered to perform a cranioplasty after a decompressive craniectomy when autologous bone graft cannot be used. The authors report the case of a 25-year-old man who benefited a unilateral decompressive craniectomy after a severe head trauma. Seven months later, a cranioplasty using custom macroporous hydroxyapatite prosthesis was performed. ⋯ Among cranioplasty prosthesis solutions, hydroxyapatite implants seem to have similar property to the bone. However, its weak mechanic resistance is an actual problem in patients susceptible to present generalized seizures with consecutive head impact. Hence, in patients with decompressive craniectomy who are exposed to potential brain injury, we favor the use of more resistant implant as PEEK prosthesis.