PHARAO laser source flight model: design and performances.

In this paper, we describe the design and the main performances of the PHARAO laser source flight model. PHARAO is a laser cooled cesium clock specially designed for operation in space and the laser source is one of the main sub-systems. The flight model presented in this work is the first remote-controlled laser system designed for spaceborne cold atom manipulation. The main challenges arise from mechanical compatibility with space constraints, which impose a high level of compactness, a low electric power consumption, a wide range of operating temperature, and a vacuum environment. We describe the main functions of the laser source and give an overview of the main technologies developed for this instrument. We present some results of the qualification process. The characteristics of the laser source flight model, and their impact on the clock performances, have been verified in operational conditions.

[Intraocular tumor diagnosed two years after perforating trauma]. / Tumor intraocular diagnosticado dos años después de un trauma perforante.

CASE REPORT: We describe the unusual diagnosis of a ciliary body medulloepithelioma by histopathology of a subretinal membrane obtained from vitreoretinal surgery of a 10-year-old boy. The patient had a history of perforating trauma OS 2 years earlier, and both fundus exam and B-scan ultrasound revealed only a retinal detachment with a subretinal membrane. No detectable mass was present. DISCUSSION: The membrane removed from underneath the peripheral retina revealed a blue cell tumor confirmed by histopathology and immunohistochemistry to be a primitive neuroectodermal tumor. Currently, the patient has been followed for 5 years with no signs of recurrence.

Tumor intraocular diagnosticado dos años después de un trauma perforante / Intraocular tumor diagnosed two years after perforating trauma

Caso clínico: Se describe el caso histopatológicopoco común de un meduloepitelioma del cuerpociliar, encontrado en una membrana sub-retiniana,que se obtuvo durante la cirugía vítreo-retiniana deun niño de 10 años de edad. Dicho paciente tenía unhistorial de haber tenido un trauma perforante en elojo izquierdo dos años antes. Tanto el examen oftalmoscópicocomo el ultrasonido revelaban sólo undesprendimiento de retina con una membrana subretiniana.No había evidencia de una masa intraocular.Discusión: La histopatología y los estudios deinmunoquímica de la membrana extraída de la retinaperiférica, revelaron un tumor de células azules,compatibles con un tumor primitivo de origen neuroectodérmico.Al momento, el paciente ha tenido cinco años de seguimiento sin recurrencia alguna (AU)

Case report: We describe the unusual diagnosis ofa ciliary body medulloepithelioma by histopathologyof a subretinal membrane obtained from vitreoretinalsurgery of a 10-year-old boy. The patienthad a history of perforating trauma OS 2 years earlier,and both fundus exam and B-scan ultrasoundrevealed only a retinal detachment with a subretinalmembrane. No detectable mass was present.Discussion: The membrane removed from underneaththe peripheral retina revealed a blue celltumor confirmed by histopathology and immunohistochemistryto be a primitive neuroectodermaltumor. Currently, the patient has been followed for5 years with no signs of recurrence (AU)

Meningo-encephalitis presenting as an acute paranoid psychosis.

A twenty-seven year old women with meningo-encephalitis and paranoid symptoms is presented. The patient was admitted to a psychiatric unit where, two months previously, her brother had been under treatment for a paranoid schizophrenic episode. The diagnostic lumbar puncture was performed after several days of increasing periods of disorientation, stupor, incontinence, posturing, and perseveration. There was no fever, no signs of meningeal irritation, and no localizing neurologic deficit. The problem of recognizing organic brain disease presenting as an acute psychotic episode is discussed. In this case, the positive family history was given inappropriate emphasis, while the good pre-morbid adjustment of the patient and the symptoms of confusion and headache were inadequately considered. Viral meningo-encephalitis, particularly that due to herpes simplex, often presents with a picture of behavioral abnormalities and minimal physical signs, and is easily confused with a functional process.