Tumeurs du cône médullaire et de la queue de cheval associées à l'hydrocéphalie chronique: à propos de 2 cas: Tumors of the conus medullaris and of the cauda equina associated with chronic hydrocephalus: about 2 cases.

Chronic hydrocephalus associated with a tumor of the conus medullaris and/or of the cauda equina is extremely rare. We here report two cases of medullary tumor revealed by the triad: dementia, difficulty walking and urinary incontinence. Magnetic resonance imaging (MRI) of the cerebrospinal fluid showed communicating hydrocephalus and intradural spinal tumors at the level of the conus medullaris and of the cauda equina. Surgical resection of a benign schwannoma and of an ependymoma allowed the resolution of the clinical symptomatology due to hydrocephalus without implantation of ventricular shunt. A dozen cases of dementia and hydrocephalus associated to spinal tumor have been reported. A variety of approaches have been proposed to explain this association but the exact pathophysiology is not accurately known.

[Meningeal melanocytoma: aggressive evolution of a benign tumor: about 2 cases]. / Mélanocytome méningé: évolution agressive d'une tumeur bénigne: à propos de 2 cas.

Meningeal melanocytomas are rare pigmented tumors affecting the central nervous system and developing in the cerebrospinal leptomeninges. We report two cases of meningeal melanocytomas showing very marked disparity in their evolution: a very long-term development of meningocerebral lesion, with malignant transformation resulting in the death of the first patient after 32 years and intramedullary ectopic location with very fast massive meningeal diffusion in the second patient. These two cases show the uncertain evolutive profile of meningeal melanocytomas. These lesions may become aggressive with poor prognosis despite an intensive therapeutic strategy.