核素骨显像在儿科中的应用

放射性核素骨显像是诊断骨和软组织感染的选择性检查方法,不但有助于隐匿性骨折(X射线诊断阴性)的诊断,在评定小儿可疑非意外损伤方面起重要的补充作用,还可为无法解释的小儿骨痛或跛行提供诸如外伤、肿瘤、或炎症性病变的诊断依据。小儿核素骨显像要求精确的操作才能获得较清晰的诊断图像,常规全身骨显像、缩放比例、附加视图及单光子发射型计算机体层摄影术的使用等都是小儿检查的常规内容,联合CT的融合图像更进一步提高诊断的灵敏度、可信度和精确度。新的放射性药物如Na18F可能在不断更新变化的儿科骨显像技术中起重要作用。     

Gallium imaging in pediatrics.

Gallium-67 citrate imaging was carried out in 59 children from 3 mo to 20 yr of age. Indications for the study included the search for occult inflammatory disease and the detection and staging of malignant disease. The Ga-67 citrate scan had a 96% reliability in confirming or excluding the site of purulent material as a cause of sepsis, and 76% reliability in detecting malignant disease. Tissue distributions in children differ from those in adults primarily in that the epiphyseal plates, spleen, and thymus may show increased activity normally and in the presence of sepsis. These variations are illustrated as possible sources of incorrect interpretation. "Cold" defects may be seen in sterile collections and avascular masses. Experience in this age group seems sufficiently encouraging to continue the use of gallium-67 citrate for the purposes described.     

New sonographic imaging observations in focal pancreatitis

The imaging findings that ultrasonographically differentiate focal acute pancreatitis (FAP) from a malignant lesion of the pancreas are described. Focal acute pancreatitis is ultrasonographically (US) characterized as a hypoechoic, homogeneous, localized, subsegmental, non-expansive and diffusely demarcated lesion located mostly in the head of the pancreas. It could not be visualized using CT. Endoscopic retrograde cholangiopancreatography (ERCP) performed in 13 of the 32 patients, showed chronic pancreatitis. Focal acute pancreatitis disappeared in 1–6 months at US follow-up. The clinical diagnoses were acute pancreatitis in 11 patients, chronic pancreatitis in 12 patients, biliary disease in 5 patients, hepatopathia in 1 patient while the diagnosis was unknown in 2 patients. No patient developed any pancreatic cancer during a median of 85 months of follow-up. In conclusion, the present data indicate that patients with FAP at US, without any focal lesion seen on either CT or ERCP, have a benign pancreatic lesion, which resolves in 1–6 months; thus, such patients probably do not need any further investigation or follow-up at all. Received: 9 February 1998; Revision received: 28 May 1998; Accepted: 7 August 1998     

Real-time, contrast-enhanced sonographic imaging in emergency radiology

PURPOSE: To report our pilot experience in the evaluation of traumatic and nontraumatic emergencies with contrast-specific, continuous-mode sonography (US) and a second-generation contrast medium. MATERIALS AND METHODS: Between January 2002 and December 2003 we evaluated 126 acute patients by using real-time contrast-specific US: blunt abdominal trauma (76 cases), penetrating abdominal trauma (3), blunt scrotal trauma (1), right upper abdominal pain (10), left upper abdominal pain (9), epigastric pain (2), flank pain (5), right lower abdominal pain (2), scrotal pain (7), postoperative abdominal sepsis (1), post-biopsy haemorrhage (1), ruptured abdominal aortic aneurysm (8), postsurgical aortic bleeding (1). In all cases the radiologist performed a complete baseline US survey and then decided whether or not to add a contrast-enhanced examination. RESULTS: All contrast-enhanced sonographic studies were completed proving to be adequate for diagnostic purposes and without adverse reactions to contrast medium. There were 40 true negatives. The final diagnosis, obtained in 85 positive cases out of 86, was: splenic injury (28 cases), hepatic injury (3), renal injury (3), multiple injuries (3), pancreatic and portal vein injury (1), colonic-mesocolic injury (1), testicular trauma (1), hepatic abscess (9), hepatic ischaemia (1), gangrenous cholecystitis (1), splenic infarction (8), splenic haematoma abscess (1), renal infection (4), renal infarction (1), necrotizing pancreatitis (1), post-biopsy haemorrhage (1), appendicitis (2), peritoneal abscesses (1), testicular torsion (6), orchiepididymitis (1), iliac artery dissection (1), ruptured abdominal aortic aneurysm (6), aortic periprosthetic hemorrhage (1). Out of 85 positive cases, agreement between baseline US and contrast-specific US was absent in 8% of cases, low in 26%, intermediate in 42%, and high in 24%. Baseline US had 3 false positives. Relevance of contrast-specific US was absent in 17% of cases, low (additional data not relevant for patient management) in 26%, intermediate (relevant additional data not modifying patient management) in 34%, and high (additional data modifying patient management) in 23%. Agreement between contrast-specific US and the gold standards was absent in 0% of cases, low in 6%, intermediate in 38%, and high in 56%. Contrast-specific US had 2 false positive results. CONCLUSIONS: Real-time contrast-specific US is an effective technique in emergency imaging. Its role should not be considered as a replacement of CT (though in some instances it can be considered a valuable alternative) but as a useful integration of conventional US. By always having the opportunity to add contrast-enhanced imaging, in case of interpretation doubts or diagnostic difficulties, the radiologist can assess the emergency patient with improved confidence and skill.     

MRI评价儿童炎性肠病的现状

近年来儿童炎性肠病的发病率呈上升的趋势,早期诊断和随访观察能有效及时地指导治疗。钡餐造影和CT小肠成像虽然能够诊断病变,但由于存在电离辐射,不适合对患儿进行多次检查;MR小肠成像是检查炎性肠病安全、有效、无创且无电离辐射的方法。综述MRI在儿童炎性肠病方面的应用现状。     

Pseudotumor of the orbit in pediatrics. Diagnostic imaging

Orbital pseudotumor is an inflammatory lesion with increased orbital mass and a typical rapid onset. It is very uncommon in children. Diagnosis is difficult and there is no uniform procedure. Two patients with different forms of this entity are presented, and their clinical symptoms and CT and ultrasonographic features are discussed. We found the CT and US findings to be important for the differential diagnosis. Therefore, these diagnostic modalities should be applied immediately on the onset of typical clinical symptoms, because the condition can result in ophthalmoplegia and amaurosis if not treated at once.     

MRI对于胎盘早剥的评价与超声对照

目的对MRI与彩色多普勒超声对胎盘早剥的诊断进行评价,评估MRI不同序列发现可视性血凝块的准确性,同时评价MRI诊断结果与临床结果的相关性。材料与方     

Emergency imaging of perineal pathology

The purpose of this paper is to review the anatomy of the perineum and to demonstrate the clinical presentation and imaging findings of perineal trauma likely to present in the acute care setting.     

难治性颞叶癫痫的分子影像学研究与病理对照

目的:对照难治性颞叶癫痫(TLE)手术病理资料,探讨联合单光子发射计算机断层(SPECT)和质子磁共振波谱(1 H-MRS)两种分子影像学技术对TLE定位的临床价值。方法:选择29例经手术病理证实的单侧TLE。所有患者术前均行SPECT发作间期脑血流(CBF)灌注显像、常规磁共振(MRI)扫描和1 H-MRS成像。将两种分子影像学技术,发作间期CBF灌注显像和1 H-MRS,对TLE的定位表现与病理结果进行对比分析。结果:病理改变最常见的是海马硬化和皮质发育不良,共27例(93.10%),此两种改变伴随出现于16例中(55.17%)。对于双重病理TLE,MRI、SPECT定位阳性率均为100%(16/16),MRS为87.50%(14/16)。对于单纯性海马硬化,MRI为阴性,SPECT仅为14.29%(1/7),而MRS高达57.14%(4/7)。对于单纯性皮质发育不全,MRS为阴性,MRI为50.00%(2/4),而SPECT高达75.00%(3/4)。联合应用SPECT和MRS对TLE定位率高达86.20%(25/29),尤其是对MRI阴性的患者,两种技术联合能发现54.55%(6/11)TLE的致痫灶。结论:联合SPECT发作间期脑血流灌注显像和1 H-MRS两种分子影像学技术能为难治性TLE提供更为全面和准确的定位诊断信息,可进一步提高定位MRI阴性TLE患者致痫灶的比例。