[Malignant fibrous histiocytoma of the orbit as second tumor in a case of bilateral retinoblastoma]. / Histiocitoma fibroso maligno de la órbita como segundo tumor en un caso de retinoblastoma bilateral.

The case of a 30 months-old child with malignant fibrous histiocytoma of the left orbit diagnosed 18 months after treatment with external beam radiotherapy for bilateral retinoblastoma is presented. The clinical and histological characteristics of malignant fibrous histiocytoma and its relation as a second malignant tumor in patients affected with retinoblastoma are analyzed.

[Automatic perimetry in screening programs]. / Périmétrie automatique dans les campagnes de recherche.

This work has studied the use of automatic perimetry in glaucoma screening programs. Subjects with suspicious glaucoma were selected on the basis of tonometry and direct ophthalmoscopy. Visual fields were analyzed using the G1 program of the Octopus 500 E automatic perimeter. A prevalence of 3.49% of glaucoma was observed in persons above 40 years old. This represents a higher incidence in comparison to other studies. The inclusion only of those subjects with suspicious glaucoma for automatic perimetry has resulted in a more precise and earlier diagnosis of glaucoma without unduly prolonging the duration of the study. Undoubtedly, automatic perimetry can improve both the reliability of the diagnosis and incidence of glaucoma in screening programs. Moreover, this does not necessarily mean more prolonged or costly studies.

[Various aspects of renal pyramid collagen seen by scanning electron microscopy]. / Algunos aspectos del colageno de la piramide renal vistos con microscopia electronica de barrido.

In apparently normal kidneys, viewed with a scanning electromicroscope, it has been observed that the renal pyramid has a collagen arranged in cells which cover vessels and tubules. These cells vary in arrangement and structure. In spite of the apparent normality, collagen variations are observed. Sometimes as a result of the increased intensity and other times because forms of neocollagen appear with accumulations of essential substances. This fact suggests that the said changes involve two circumstances. Either this tissue changes continuously or the said kidneys have some lesion in their collagen which leads to new forms of neocollagen appearing and to the great richness of essential substances.