RESUMO
A CT examination of a woman with an intraocular melanoma revealed a high density mass lesion with an adjacent retinal detachment of slightly lower density. The "double density" identified in this case can serve as a useful sign in distinguishing melanomatous lesions with accompanying retinal tears.
Assuntos
Neoplasias da Coroide/diagnóstico por imagem , Melanoma/diagnóstico por imagem , Descolamento Retiniano/etiologia , Tomografia Computadorizada por Raios X , Neoplasias da Coroide/complicações , Feminino , Humanos , Melanoma/complicações , Pessoa de Meia-Idade , Descolamento Retiniano/diagnóstico por imagemRESUMO
Scanning electron microscopy of vascular corrosion replicas and light microscopy revealed a pair of highly vascularized tissues, the carotid labyrinths, in the dorsal head region of the channel catfish, Ictalurus punctatus, the black bullhead, I. melas, and the walking catfish, Clarias batrachus. The labyrinth consists of a myriad of arterioles that arise from the common carotid artery immediately distal to the origin of the common carotid from the efferent branchial (epibranchial) artery of the first gill arch. The arterioles anastomose with each other to form: (1) the internal carotid artery which supplies the brain, and (2) several anteriolateral arteries that extend into the anterior head. In the ictalurids the common carotid artery emerges from the labyrinth intact and continues anteriorly as the large olfactory artery, whereas in Clarias all postlabyrinthine vessels result from arborization of the common carotid and subsequent anastomosis of the arterioles. Similarities between piscine and amphibian carotid labyrinths and the anatomical proximity of the former with the gills suggest that, in Ictaluridae, the labyrinth has a chemo- or baroreceptor function.
Assuntos
Corpo Carotídeo/irrigação sanguínea , Peixes/anatomia & histologia , Animais , Arteríolas/ultraestrutura , Artérias Carótidas/ultraestrutura , Corpo Carotídeo/fisiologia , Corpo Carotídeo/ultraestrutura , Células Quimiorreceptoras , Microscopia Eletrônica de Varredura , PressorreceptoresRESUMO
The syndrome of massive and sometimes fatal epistaxis from an aneurysm of the internal carotid artery is reviewed. Two cases are reported in which exsanguination occurred with anterior and posterior gauze packing in place. The use of standard methods for controlling severe epistaxis in this syndrome was a futile exercise. This distressing and frustrating experience prompted the development of an emergency method to prevent exsanguination pending definitive surgical treatment. A description of this technique is presented and a proposal made for its use.