RESUMO
Esophageal duplications are congenital abnormalities of the foregut. We present the case of a 33-year-old woman suffering from progressive dysphagia who had surgery for esophageal duplication. The following three criteria define the cystic lesion: an intimate attachment to the esophageal wall, the presence of a smooth muscle coat and a mucosal lining consisting of squamous and/or ciliated respiratory epithelium. Diverticula, bronchogenic cysts and cystic neoplasms have to be considered in the differential diagnosis. Congenital cystic esophageal duplication is a rare cause of dysphagia in adulthood.
Assuntos
Transtornos de Deglutição/patologia , Cisto Esofágico/congênito , Cisto Esofágico/patologia , Esôfago/anormalidades , Adulto , Transtornos de Deglutição/cirurgia , Diagnóstico Diferencial , Progressão da Doença , Cisto Esofágico/cirurgia , Estenose Esofágica/congênito , Estenose Esofágica/patologia , Estenose Esofágica/cirurgia , Esofagoscopia , Esôfago/cirurgia , Feminino , Humanos , Grampeamento Cirúrgico , Toracoscopia , Tomografia Computadorizada por Raios XRESUMO
Single crystals of the cerium intermetallic compound CeIr(2)Zn(20) were grown by the flux method, and studied by means of x-ray diffraction, magnetic, electrical transport, and thermodynamic measurements. The compound crystallizes with the cubic CeCr(2)Al(20)-type crystal structure, in which the Ce and transition metal atoms are located inside cages formed by the Al/Zn atoms. CeIr(2)Zn(20) shows paramagnetic behavior and metallic-like electrical conductivity. The bulk physical data conjointly indicate its intermediate valence character due to an unstable 4f shell. Accordingly, the charge carriers in this material exhibit moderate mass enhancement. The observed physical behavior in CeIr(2)Zn(20) is in concert with the electronic structure of the compound, calculated within the local spin density approximation.
RESUMO
The magnetic, electrical transport and thermodynamic properties of the compounds UFe2Zn20 and URu2Zn20 were studied on single-crystalline specimens over wide ranges of temperature and magnetic field. The results indicate that the two ternaries are paramagnetic moderately enhanced heavy fermion systems. Their physical behavior is governed predominantly by the hybridization of uranium 5f orbitals with electronic states of ligands, which brings about considerable delocalization of the 5f states.