ABSTRACT
Objective To evaluate the multi-spiral CT(MSCT)imaging features and classification of renal pelvis carcinoma.Meth-ods 76 patients of renal pelvis carcinoma proved pathologically were analyzed retrospectively,and divided into different types ac-cording to the MSCT features.The MSCT differences for different types were analyzed.Results Most of the tumors showed iso-density or slight hyperdensity (95%)on un-enhanced images,and persistent mild-to-moderate enhancement (91%)in enhanced im-ages.All cases were divided into three types:pelvic mass type in 30 cases (39%),substance invasion type in 25 cases (33%),wall thickening type in 21 cases (28%).All cases were also divided into two types:substance invasion type(25 cases,33%)and renal pelvis type(5 1 cases,67%).The occurrence rate of local low enhancement,whole kidney low enhancement,hydronephrosis,lymph node metastasis and vein tumor thrombus were 80%,20%,48%,52%,1 6% in substance invasion type cases,and 4%,42%, 75%,4%,6% in the renal pelvis type cases,respectivily.Conclusion MSCT multiphase enhancement scanning shows important valuation in the diagnosis and classification of renal pelvis carcinoma.Obvious differences of CT features are showed for different types.The diagnosis accuracy may be improved by the knowledge of substance invasion type.
ABSTRACT
Objective To study the clinical manifestations,etiology,magnetic resonance imaging features,prognosis of patients with bilateral medial medullary infarction.Methods The clinical information of two case reports were summarized with review of the literature.Results The 2 patients with bilateral medial medullary infarction reported here were manifested with progressive quadriplegia,both complicated with respiratory disorders.On etiology,both were due to atherosclerosis,and one was combined with congenital vascular variation.The Y shaped hyperintense signals were seen in diffusion weighted imaging (DWI) cross-section in the medulla oblongata level.And both had poor outcomes that one was dead and the other was discharged with tracheotomy and severe sequela.Conclusions Bilateral medial medullary infarction is presented with complicated symptoms such as quadriplegia,dysarthria,hypoglossoplegia,even respiratory failure,in which quadriplegia is most often seen,and it is associated with a poor clinical prognosis.DWI appears the characteristic Y Shaped sign.
ABSTRACT
Objective To investigate the effects of chin lift on the patency of upper airway in normal conscious adults using magnetic resonance imaging (MRI).Methods Sixteen healthy volunteers aged 21-35 yr with a body mass index of 17-26 kg/m2 were enrolled in this study.The subjects lay on their back with their heads slightly extended.The lower jaw was first left in standard position.The mouth was slightly open (the distance between the upper and lower incisors was 0.5 cm).The chin was then lifted upward.The upper airway (from the base of slull to the level of vocal cord) was scaned by MRI along the median sagital plane.The length of soft palate,root of tongue and epiglottis and the area of pharyngeal cavity were measured.The position of the rim of epiglottis was examined.The mean percentage changes induced by chin lift were calculated.Results Compared with standard position,chin lift significantly prolonged the length of soft palate,root of tongue and epiglottis and increased the area of pharyngeal cavity.The percentage change in the position of the rim of epiglottis was largest after chin lift.Conclusion Chin lift significantly improve the patency of the upper airway in conscious adult by changing the position of the rim of epiglottis and increasing the area of pharyngeal cavity.