A preservação ambiental é de extrema importância para manter o equilíbrio ambiental no planeta. As unidades de conservação (UC) foram criadas no intuito de preservar o meio ambiente em diversas regiões. O Parque Nacional Serra dos Órgãos (PARNASO) é uma UC que abriga grande parte da flora e da fauna da Mata Atlântica brasileira, tornando-o uma importante unidade para a preservação da natureza. O PARNASO está situado no estado do Rio de Janeiro, nos municípios de Teresópolis, Petrópolis, Guapimirim e Magé, tendo uma área aproximada de 20.024 hectares. Apresenta clima mesotérmico brando superúmido com temperatura média anual variando de 13° a 23°C, relevo escarpado com grande variação de altitude. No parque nascem diversos rios como: Soberbo, Bananal, Sossego, Inhomirim, Magé, Santo Aleixo, Inconha e Corujas. O parque abriga diversas espécies animais e vegetais e neste artigo estão listadas e caracterizadas 6 espécies do reino Plantae e 6 espécies do reino Animalia são elas: Adenocalymma comosum, Chorisias speciosa, Buddleja stachyoides, Phalaenopsis hybridus, Tillandsia cyane, Euterpe edulis, Nasua nasua, Procyon cancrivorus, Cerdocyon thous, Brachyteles arachnoides, Alouatta guariba, Cebus nigritus.

This study aims to demonstrate, through a clinical case report, the applicability of the use of microtomography (µCT) in the histopathological evaluation of a ranula lesion on the oral floor and to evaluate the use of 2 % elemental iodine solution as a contrast agent, in order to obtain a better contrast effect in a tissue sample, thus facilitating the identification of anatomical structures, the histomorphological evaluation and the potential use of µCT in the imaging diagnosis of lesions. Different parameters were evaluated for obtaining images in SkyScan 1172, in a biopsied piece, when impregnated in a 10 % formalin solution and in a 2 % elemental iodine solution, when impregnated for 24h and 48h. Contrast agent impregnation was evaluated using the Hounsfield unit. The use of µCT allowed the identification of sialoliths dispersed inside the biopsy specimen, while the impregnation with Elemental iodine 2 % for 24h resulted in a better contrast when compared to the other conditions. The use of the Hounsfield unit allowed an adequate evaluation of the contrast obtained when the different parameters of impregnation and image acquisition were applied. The comparison between the 3D images with and without a specific marker highlighted a better evidencing of the soft tissues, with an improvement in the contrast of the images, also allowing the identification of the glandular duct obstructed by the sialoliths, allowing a conclusive histopathological evaluation of the biopsied lesion.