Disección espontánea de arterias viscerales: reporte de una serie de casos / Spontaneous dissection of visceral arteries: a series of cases

Background: Spontaneous dissections of visceral arteries are rare and usually secondary to other disease. There is paucity of information about their natural course. Aim: To describe the imaging, clinical characteristics and follow-up of spontaneous visceral artery dissections diagnosed at our institution. Material and Methods: We report a series of 14 patients in whom a spontaneous dissection of a visceral artery was diagnosed on abdominal angio-CT between 2010 and 2018. Clinical features and evolution were recorded. Results: Isolated lesions of the celiac axis were the most common finding. Multiple territories were involved in 14% of cases. A dissection flap was observed in four cases, a hematoma-dissection complex in seven and an aneurysmal dilatation associated with the dissection in three. Of the 10 patients who were followed at our institution, 90% had stabilization or partial regression of the imaging findings. In the remaining case, new dissection events were observed. All cases were managed conservatively, and no death was reported. Conclusions: In this series of patients, spontaneous dissection of visceral arteries had a benign, favorable course, requiring only conservative management.

Enfermedad quística adventicial de la arteria poplítea: presentación imagenológica de una causa rara de claudicación intermitente / Adventitial cystic disease of the popliteal artery as a cause of intermittent claudication: not your usual suspect: report of one case

Adventitial cystic disease of the popliteal artery is a rare condition of uncertain etiology, which presents as intermittent claudication of the lower extremity in middle-age patients. We report a 44-year-old man presenting with intermittent claudication of his left leg. MR angiography showed cystic parietal lesions that caused compression with partial occlusion of the left popliteal artery. Surgical resection of the affected segment was performed, with venous graft interposition. The histopathological analysis of the surgical specimen was consistent with cystic adventitial disease.

La capa de ozono y el agujero Antártico / The ozone layer and the Antarctic hole

El ozono es un gas presente en la atmósfera en muy pequeñas cantidades,aproximadamente una parte en un millon en volumen.Desde hace casi dos décadas, con la llegada de la primavera austral,los medios de comunicacion alertan sobre la aparicion de un nuevo agujero de ozono sobre la Antartida.(au)