PURPOSE To report a case of diffuse peripapillary choroidal melanoma which began as a small choroidal nevus and was successfully treated with gamma knife radiotherapy. METHODS Observational case report. RESULTS A 31-year-old visually asymptomatic man presented for a routine eye examination and was noted to have a small choroidal nevus. Six years later, the lesion had become a diffuse juxtap...

The accuracy of the dose planning system (Leksell GammaPlan), used in Gamma Knife (type B) radiosurgery at extreme irradiation depths, was verified using the Monte Carlo technique. EGS4 Monte Carlo calculations were employed to calculate the dose distribution along the x, y and z axes for an irradiation relatively shallow in a spherical bony cavity water phantom. Two different sizes of the coll...

A 10-year-old girl suffering from a penetrating orbital stab wound with a knife on the inner canthus of her right eye is reported. Clinical examination of the patient displayed no signs of globe perforation or neurological deficits. The knife was removed slowly with careful and controlled motions. At the last visit three months after the surgery, visual acuity was 20/20, anterior and posterior ...

canthus. I suggested a small operation to which he readily agreed. After applying some local anaesthetics, I passed the point of a Graefe's knife; some gelatinous fluid came out and, to my surprise, I noticed on the point of the knife as if some white thread-like things were moving, with a fine hook I managed to take out the things which were practically the

The paper introduces virtual manufacturing application in the Fields Cultivate Machines and mainly discusses the model-building of rotary-cultivate part, physical model and mathematical model included. With the model, the rotary knife is optimized, the force on the bend part is decreased, and therefore, the service life is prolonged. At the same time, with dynamic analysis software Adams, the m...

Air knives with very different nominal values are used for various purposes in the industry. The uses of air include painting and coating stages automobile semi-finished products, as well many related to food production. One important sectors among these is continuous hot-dip galvanizing process, which a technique steel In addition, chemical process on paper thin layer another research topic. m...

In microtomy, faults of the cutting edge are an obvious and avoidable source of artifact. The purpose of this communication is to describe a simple apparatus for viewing and marking the cutting edge of the glass knives which are used in see-tioning for electron microscopy (1, 2). The apparatus consists of a monocular microscope with base, arm, body tube, coarse and fine adjustments, an annular ...

A 46-year-old man stabbed himself with a knife. While he was stable, frontal and lateral chest radiographs were obtained (Fig. 1). Following a cardiac arrest, emergency sternotomy and cardiopulmonary bypass were performed. The acute margins of the heart and diaphragm were lacerated. The knife passed 5 mm posteromedial to the inferior vena cava (Fig. 2). Recovery was uneventful. Figure 1: Fronta...

The management of pituitary adenomas entails a multidisciplinary approach that involves neurosurgeons, endocrinologists, and radiation oncologists. Traditionally, the treatment included medical management, surgery (transsphenoidal microsurgical resection and transcranial approaches), and conventional fractionated radiotherapy. Stereotactic radiosurgery, through the various competing radiosurgic...

BACKGROUND Low-grade gliomas are uncommon primary brain tumors, located more often in the posterior fossa, optic pathway, and brain stem and less commonly in the cerebral hemispheres. CASE PRESENTATIONS Two patients with diagnosed recurrent cystic pilocytic astrocytoma critically located within the brain (thalamic and brain stem) were treated with gamma knife surgery. Gamma knife surgery (GKS...