[Rhabdoid tumor of the central nervous system. Ultrasonographic, computed tomographic and MRI aspects apropos of a case in an infant]. / Tumeur rhabdoïde du système nerveux central. Aspect échographique, scanographique et IRM à propos d'un cas chez un nourrisson.

We report a case of rhabdoid tumor which developed in the IV ventricle in a 4-month-old boy. Cranial ultrasonography, CT-scan and MRI findings are reported and compared with data in the literature.

[Intraspinal epidermoid cyst]. / Kyste épidermoïde intrarachidien.

Epidermoid cysts are rare intradural extramedullary tumors. There are two types of lesions: congenital spinal cysts frequently associated with other bone or skin malformations (spina bifida aperta, dermal sinus ...) and iatrogenic spinal cysts resulting from lumbar puncture. In both situations, clinical and the radiologic findings are similar. We describe an epidermoid cyst in a 52-year-old female affected with a lumbar pain and recent urinary disorders. Symptoms were slow to appear and dependent on the location of the cyst. Epidermoid cyst contained keratin, cholesterol crystals and desquamed epithelial cells. On CT, epidermoid cyst was a hypodense lesion on MR. On T1 weighted images the tumor was hypointense. The signal appeared heterogeneous. There was no enhancement after Gadolinium DTPA injection. Differential diagnosis included: ependymoma, hemangioblastoma, neurinoma, meningioma and metastasis, but all these lesions are enhanced by contrast injection.

Imaging of thoracic and lumbar spinal extradural arachnoid cysts: report of two cases.

Extradural arachnoid cysts are uncommon expanding lesions in the spinal canal which may communicate with the subarachnoid space. Usually in the lower thoracic spine, they may cause symptoms by compressing the spinal cord or nerve roots. We report cases of thoracic and lumbar arachnoid cysts studied by cystography, myelography, CT and MRI. These techniques showed extradural cystic lesions containing cerebrospinal fluid, with variable communication with the subarachnoid space, causing anterior displacement and flattening of the spinal cord.

Control de la calidad del agua de riego en Mendoza. Caso Dique El Carrizal

El objetivo del trabajo fue determinar la variación en la calidad del agua que egresa del embalse respecto de la que ingresa. Se seleccionaron dos sitios para muestreo mensual, se realizaron análisis físicos, químicos y microbiológicos para compararlos en ambos puntos. Los resultados demuestran que la contaminación, en general, aumenta durante el verano junto con la dilución y con ello la factibilidad de biodegradación. Se puede afirmar que se estaría produciendo un marcado proceso de eutroficación, el que estaría contribuyendo al deterioro de la calidad del agua en el embalse

[Colonic lumbar hernia secondary to congenital bone anomalies in a case of neurofibromatosis type I]. / Hernie colique lombaire secondaire à des anomalies osseuses congénitales entrant dans le cadre d'une neurofibromatose de type I.

We report here a case of an asymptomatic lumbar hernia through a congenital defect of the posterior abdominal wall secondary to hypoplasia of the left part of the neural arch of L5 and S1. The bone defect was related to the neurofibromatosis of the patient. Plain radiograms showed a scoliosis and the bone defect. CT scan confirmed the osseous abnormalities and demonstrated a left colonic herniation through the bone defect. Many cases of lumbar hernia secondary to weakness of the abdominal muscles or following bone defects after bone graft harvesting, surgery or trauma have been described. This is, to our knowledge, the first case report of a lumbar hernia secondary to a congenital bone defect.