RESUMO
Moyamoya is characterized as a non-atherosclerotic and non-inflammatory vasculopathy that leads to progressive stenosis of the intracranial internal carotid arteries as well as the Circle of Willis. While it can be idiopathic (Moyamoya disease) or associated with another condition (Moyamoya syndrome), there is a characteristic 'puff of smoke' sign that can be appreciated on cerebral angiography.
Assuntos
Angiografia Cerebral , Doença de Moyamoya , Humanos , Angiografia Cerebral/métodos , Diagnóstico Diferencial , Doença de Moyamoya/diagnóstico por imagemRESUMO
The hook sign is a radiologic finding best appreciated on a sagittal view of the celiac artery with computed tomography (CT) that indicates compression of the celiac artery. It refers to the hooked-shape of the proximal celiac artery caused by extrinsic compression by the median arcuate ligament. When seen in a patient with concurrent abdominal symptoms, it suggests median arcuate ligament syndrome (MALS). We saw the sign in a 15-year-old male via duplex ultrasonography and abdominal CT. He underwent laparoscopic release of the median arcuate ligament and had full resolution of his symptoms at follow-up.
Assuntos
Artéria Celíaca , Síndrome do Ligamento Arqueado Mediano , Tomografia Computadorizada por Raios X , Humanos , Masculino , Síndrome do Ligamento Arqueado Mediano/diagnóstico por imagem , Síndrome do Ligamento Arqueado Mediano/complicações , Adolescente , Artéria Celíaca/diagnóstico por imagem , Artéria Celíaca/anormalidades , Laparoscopia , Ultrassonografia Doppler Dupla/métodosRESUMO
The bear paw sign is a radiologic sign seen on computed tomography (CT) that indicates the development of xanthogranulomatous pyelonephritis (XGP). It refers to the multiple, rim-enhancing, low attenuation renal collections seen in the diffuse form of XGP. The term "bear paw" sign first appeared in the literature in 1989 and has since been widely used to describe this serious, but treatable, pathology.
Assuntos
Pielonefrite Xantogranulomatosa , Radiologia , Humanos , Rim/diagnóstico por imagem , Pielonefrite Xantogranulomatosa/diagnóstico por imagem , Tomografia Computadorizada por Raios XRESUMO
Developmental venous anomalies (DVAs) are characterized by many radially oriented medullary veins surrounding a central draining vessel. When the imaging plane is perpendicular to the central vessel, these medullary veins resemble Medusa's head of snakes. Medusa's head sign, or caput medusae, can be appreciated on contrast enhanced CT scans and MRIs of the brain and is highly indicative of a DVA.