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Metastases of lateral ventricle (LV) are attached to choroidal plexus. Primary source is cancer of kidney. Two thirds of patients are male. Oligodendrogliomas occur in young females. Signs of increased intracranial pressure are a constant feature. These tumors are found in anterior portion of the LV with severe enhancement and clumped calcifications. Treatment is surgical. Cavernomas have a preponderance of rapid growth with a bleeding revelation. Seizures are rare. Rebleeding is frequent and justifies a surgical treatment. Schwannomas are a rare entity in which the majority of patients are very young. MRI shows calcifications, cystic components and a strong enhancement. They are limited to sporadic cases, never associated with neurofibromatosis. Arachnoid cysts are located in the atrium and/or in the occipital horn. Patients are young (mean age < 40 years). MRI demonstrates an intracystic lesion with signal intensity similar to the CSF. Best treatment is an endoscopic fenestration. Epidermoid cysts occur in third decade. These pearly tumors appear isointense or a little hyperintense on T1-weighted imaging, very characteristic. They are enhanced after gadolinium injection and appear strongly hyperintense on T2-weighted imaging. An incomplete removal with a thorough long-term follow-up is necessary. Cavernomas of LV are hyperintense on T1- and T2-weighted imaging. They have a bleeding risk of 25 to 45%. Therefore, they must be operated., (Copyright © 2011. Published by Elsevier Masson SAS.)

Intradiploic meningoencephalocele is rarely found in adulthood. It is thought to be postraumatic and must be differenciated from congenital encephalocele. Imaging findings, particularly with Magnetic Resonance Imaging, are useful in determining the various linings and contents of this intradiploic defect.

We report a case of growing fracture of the orbital roof in a 5-year-old child. The presenting sign was a pulsatile orbital mass. This child had a history of a minor head injury with orbital impact 2 years ago. Cerebral CT scan revealed a diastatic fracture of the right orbital roof. On MRI a leptomeningeal cyst extending in the orbital cavity was shown. Frontal craniotomy with direct repair of the dural and bone defects was performed. The outcome was excellent. In the literature the exact pathophysiology of the growing fractures is still debated but a dural laceration along the fracture line is noted in all the cases. They are mostly located in the cranial convexity, and rarely affect the skull base. Only 5 similar cases were found in the relevant literature. Growing fracture of the orbital roof should be suspected if ocular symptoms appears in childs who have sustained a head injury several months or years ago.

Two cases of arachnoid cyst in the lumbar region are described. One is intradural, acquired, and associated to severe arachnoiditis while the other is extradural in location and probably congenital. The interest of myelography, CT myelography, and MRI for the diagnosis is discussed.

A 15 year old boy presents two fractures of the left inferior member (femur and tibia), after a motor-cycle accident. An osteosynthesis by plate and screws was performed, in emergency. In immediate post-operative days, a radicular paresia of the left inferior member appear especially on exterior popliteus sciatic nerve. The electromyogram confirm the diagnosis. However, these is nor pain nor fracture of the sacro-lumbar spine. The consolidation of femur and tibia fractures is normal. The neurologic recuperation is slow but progressive. A year after the accident, because the recuperation is not complete, an MRI is performed. An arachnoidal cyst surrounding the L5 and S1 roots is diagnosed. The surgery is decided. The ablation of the cyst is performed in the same operative time that the ablation of plate. The histology of the paries of the cyst confirm, by hemosiderimic deposits, the traumatic etiology. The arachnoïdal cyst is rare, particularly in the childhood. It is always difficult to know the relation between the cyst and the symptom. It is also impossible to be certain of traumatic etiology: traumatic cyst or traumatised cyst? The surgical indication is lawful by the existence of clinical signs, because 50 per cent of cases are improved or recovered.