RESUMEN
HISTORY AND CLINICAL FINDINGS: A 62-year-old woman was admitted because of sudden onset of increasingly severe pain in the left lower leg and foot. She also reported having had diarrhoea for the past few days. INVESTIGATIONS: Physical examination revealed a cold and pale left leg below the knee joint. Peripheral sensory and motor functions were normal. While femoral and popliteal arterial pulses were normally palpable, foot pulses were not felt. Magnetic resonance angiography of the pelvic and leg arteries showed an embolic occlusion of the left popliteal artery extending to the arteries of the lower leg. DIAGNOSIS, TREATMENT AND COURSE: Because of the acute embolic occlusion of the deep femoral and popliteal arteries an embolectomy of the deep and superficial femoral arteries was performed. The source of the emboli had been a free-floating thrombus in the descending aorta. Subsequently a persistent fever and leukocytosis occurred which had been cause by a septic splenic infarction. A conventional splenectomy was done. The postoperative was protracted, because of the development of a pancreatic fistula, which responded to treatment. Anticoagulation treatment started. The patient was finally discharged after more than five weeks. CONCLUSION: After urgent surgical treatment of an acute peripheral arterial occlusion its cause needs to be identified. Transthoracic echocardiography, computed tomography and magnetic resonance angiography are the methods of choice. If there is a floating aortic thrombus further embolizations, including septic splenic emboli may occur.
Asunto(s)
Embolia/complicaciones , Arteria Femoral , Arteria Poplítea , Infarto del Bazo/etiología , Aorta Torácica , Ecocardiografía , Embolectomía , Embolia/diagnóstico , Embolia/cirugía , Femenino , Arteria Femoral/cirugía , Fiebre/etiología , Humanos , Leucocitosis/etiología , Angiografía por Resonancia Magnética , Persona de Mediana Edad , Fístula Pancreática/etiología , Fístula Pancreática/terapia , Arteria Poplítea/cirugía , Complicaciones Posoperatorias/etiología , Complicaciones Posoperatorias/terapia , Esplenectomía , Infarto del Bazo/cirugía , Trombosis/complicaciones , Tomografía Computarizada por Rayos XRESUMEN
With reference to radiosurgery of the liver, we describe techniques designed to solve the methodological problem of striking targets subject to respiratory motion with the necessary precision. Implanting a gold marker in the vicinity of the liver tumor was the first step in ensuring the reproducibility of the isocenter's position. An 18-karat gold rod measuring 1.9 x 3 mm was implanted approximately 2 cm from the edge of the tumor as this was displayed in the spiral, thin-slice CT with contrast media. Both the implantation of the marker and the required, CT-controlled biopsy of the liver tumor can be achieved simultaneously with the same puncture needle. The efficiency of high-frequency jet ventilation (HFJV) in neutralizing the targeted organ's respiratory motion during stereotactic single-dose irradiation was evaluated. The procedure was carried out on ten patients without any complications. In the time between treatment planning and irradiation (3 days), no significant marker migration was observable. In all cases, the gold marker (volume: 7.5 mm(3)) was readily observable in the treatment beam using portal imaging. HFJV provided reliable immobilization. The liver motion in each anesthetized patient was limited to under 3.0 mm in all directions. Thus, the correct field settings and target reproducibility were able to be analyzed and documented during the irradiation. The combination of marker and HFJV enables the determination of stereotactic coordinates directly related to the liver itself and, in this way, stereotactic radiation treatment of liver tumors is freed from the uncertainties involved in orientation to bony landmarks, in respiratory motion, and in changes of position in the stereotactic body frame. The method is feasible and can improve the accuracy of stereotactic body radiation therapy.
Asunto(s)
Oro , Ventilación con Chorro de Alta Frecuencia , Neoplasias Hepáticas/cirugía , Radiocirugia/métodos , Humanos , Inmovilización , Neoplasias Hepáticas/diagnóstico por imagen , Tomografía Computarizada por Rayos XRESUMEN
PURPOSE: Is there a loss of information when using selenium radiographic images displayed with reduced image format compared to full format? METHOD: Digital selenium radiographic chest images in two planes were obtained in 35 patients for medical reasons. The digital data sets of each patient were separately displayed in full format on two different films and were printed in reduced format on one film. The format was reduced to 61% of the full format using an acquisition matrix of 2166 x 2488 pixels, an image display matrix of 4000 x 5000 pixels and a film format of 43 x 49 cm. All images were anonymously evaluated by four independent readers using a questionnaire concerning anatomic structures. RESULTS: Format reduction did not result in a loss of information in diagnostically relevant anatomic details. CONCLUSIONS: Displaying digital selenium radiographic data sets of thoracic view in two planes on one film presumably does not lead to a loss of diagnostic information. This procedure may help to reduce film costs.
Asunto(s)
Intensificación de Imagen Radiográfica/métodos , Radiografía Torácica/métodos , Selenio , Película para Rayos X , Adulto , Anciano , Estudios de Evaluación como Asunto , Femenino , Humanos , Masculino , Persona de Mediana Edad , Variaciones Dependientes del Observador , Intensificación de Imagen Radiográfica/instrumentación , Radiografía Torácica/instrumentación , Radiografía Torácica/estadística & datos numéricos , Tórax/anatomía & histología , Película para Rayos X/estadística & datos numéricosRESUMEN
PURPOSE: To find out the diagnostic value of digital selenium radiography, we compared the image quality of chest x-ray images from 50 patients who had been examined via conventional chest x-ray and digital selenium radiography of the chest. METHOD: 50 patients with a malignant melanoma underwent chest x-ray within 3 months in conventional technique and with digital selenium radiography (Thoravision: Philips Medical Systems, Hamburg, Germany). In this period none of the patients showed a difference in respect of clinical status or radiological diagnosis. Simultaneous examinations on the same day were not performed to avoid unnecessary exposure to x-rays. The digital and conventional images were compared by 4 radiologists with regard to image quality by the detection of defined anatomic structures. RESULTS: Image quality of digital selenium radiography was considered superior to that of conventional chest x-rays in the mediastinum, the retrocardiac and retrodiaphragmatic areas, the superior and inferior lobes of the lung especially near the parietal pleura, and the chest wall. CONCLUSIONS: Compared to analogous techniques there is no loss of image information when employing digital selenium radiography in chest x-rays. On the contrary, new assessment criteria may be gained. We conclude that digital selenium radiography offers diagnostic advantages in chest x-ray examination.
Asunto(s)
Intensificación de Imagen Radiográfica/métodos , Radiografía Torácica/métodos , Selenio , Adulto , Anciano , Estudios de Evaluación como Asunto , Femenino , Humanos , Masculino , Melanoma/diagnóstico por imagen , Persona de Mediana Edad , Intensificación de Imagen Radiográfica/instrumentación , Radiografía Torácica/instrumentación , Radiografía Torácica/estadística & datos numéricos , Neoplasias Torácicas/diagnóstico por imagen , Pantallas Intensificadoras de Rayos XRESUMEN
BASIC PROBLEM AND OBJECTIVE: In rare instances Pneumocystis carinii pneumonia (PCP) can occur in a cystic form, characterized by an acute course. The correct diagnosis is often missed. An analysis of a large cohort of patients with PCP was undertaken to determine the incidence and clinical manifestations of this form of the disease. PATIENTS AND METHODS: Data on all HIV-positive patients on the hospital registry, hospitalized with the diagnosis of PCP between January 1988 and July 1996, were retrospectively analysed. To be included in the study, PCP had to have been confirmed microscopically on bronchial lavage or histologically by lung biopsy. The chest radiogram and (if available) computed tomogram of these patients were examined for possible cystic changes, and clinical as well as laboratory findings recorded. RESULTS: Five of 180 patients with PCP had cystic changes (2.8%). The interval between first symptoms and diagnosis ranged from 30 to 200 days (median: 32 days). All five patients (age: 24-49 years; all males) had a far advanced immunological disorder (median CD4 count: 10/microliter) and were in stage C3 (Centers for Disease Control). Three of the five patients had prophylactically inhaled pentamidine (300 mg/month). Bronchial lavage was false-negative in three of the five cases. One patient had a spontaneous pneumothorax. Lactate dehydrogenase levels were normal or only slightly elevated (207-417 U/l; median 305 U/l). Both the cavities and thin-walled cysts were demonstrated radiologically, but were more visible on CT than on the X-ray film. All patients responded well to the medication with cotrimoxazole, but the prognosis was poor with a survival time of only 0.3 to 16 months. CONCLUSION: PCP should be included in the differential diagnosis when HIV patients have cystic lung changes. Invasive diagnostic methods are often required to avoid wrong diagnosis and superfluous therapeutic interventions.
Asunto(s)
Infecciones por VIH/complicaciones , Pulmón/diagnóstico por imagen , Neumonía por Pneumocystis/etiología , Adulto , Biopsia , Recuento de Linfocito CD4 , Estudios de Cohortes , Diagnóstico Diferencial , Infecciones por VIH/clasificación , Infecciones por VIH/inmunología , Humanos , Incidencia , Pulmón/patología , Masculino , Persona de Mediana Edad , Neumonía por Pneumocystis/diagnóstico por imagen , Neumonía por Pneumocystis/epidemiología , Estudios Retrospectivos , Toracoscopía , Tomografía Computarizada por Rayos XRESUMEN
RATIONALE AND OBJECTIVES: The authors experimentally assess and compare the detection limit of gastrointestinal bleeding in digital subtraction angiography (DSA) and conventional screen-film angiography. MATERIALS AND METHODS: Arterial blood flow was simulated using a tube model in which bleeding was imitated by exudation of liquid containing contrast material. Gut peristalsis was imitated using silicone tubes filled with air and liquid. Images were acquired by DSA and conventional screen-film angiography. The iodine concentration was increased in increments from 1 mg I/mL, with and without simulated peristalsis, and with both free and circumscribed extravasation of contrast material. RESULTS: The detection limit for free extravasation in DSA was 1 mg I/mL without peristalsis and 60 mg I/mL with peristalsis. The corresponding figures for circumscribed extravasation were 1 mg I/mL and 34 mg I/mL. The detection limit for free extravasation in screen-film angiography was 172 mg I/mL both with and without simulated peristalsis. Circumscribed extravasation was detected at 9 mg I/mL without peristalsis and 7 mg I/mL with peristalsis. CONCLUSION: Digital subtraction angiography is the more sensitive angiographic technique for detection of gastrointestinal bleeding and is superior to conventional screen-film angiography, provided that it is performed with adequate parasym-pathicolysis and suspended respiration. Only when these requirements cannot be achieved is screen-film angiography advantageous.
Asunto(s)
Angiografía de Substracción Digital , Angiografía , Hemorragia Gastrointestinal/diagnóstico por imagen , Medios de Contraste , Extravasación de Materiales Terapéuticos y Diagnósticos , Humanos , Modelos Cardiovasculares , PeristaltismoAsunto(s)
Lipodistrofia/diagnóstico por imagen , Mamografía , Anciano , Autopsia , Mama/patología , Femenino , Humanos , Lipodistrofia/patologíaRESUMEN
A hitherto unique case of ectopic gastric mucosa of the gallbladder in combination with a congenital duodenal stenosis in an young male adult is presented and the etiology of both anomalies is elucidated. While the intestinal obstruction was confirmed prior to the operation, the diagnosis of the gastric heterotopia in the gallbladder has been established, as usually, first by histopathologic examination. Both anomalies required surgical treatment. The long-standing indistinct abdominal complaints of the patient vanished after cholecystectomy and duodenojejunostomy.
Asunto(s)
Coristoma/congénito , Obstrucción Duodenal/congénito , Neoplasias de la Vesícula Biliar/congénito , Mucosa Gástrica , Adulto , Colecistectomía , Coristoma/etiología , Coristoma/patología , Coristoma/cirugía , Obstrucción Duodenal/etiología , Obstrucción Duodenal/patología , Obstrucción Duodenal/cirugía , Duodeno/patología , Vesícula Biliar/patología , Neoplasias de la Vesícula Biliar/etiología , Neoplasias de la Vesícula Biliar/patología , Neoplasias de la Vesícula Biliar/cirugía , Humanos , Yeyunostomía , MasculinoAsunto(s)
Neoplasias de los Nervios Craneales/patología , Neurilemoma/patología , Neurofibroma/patología , Nervio Trigémino/patología , Adulto , Medios de Contraste , Neoplasias de los Nervios Craneales/cirugía , Femenino , Gadolinio , Gadolinio DTPA , Humanos , Imagen por Resonancia Magnética , Masculino , Persona de Mediana Edad , Neurilemoma/cirugía , Neurofibroma/cirugía , Compuestos Organometálicos , Ácido Pentético/análogos & derivados , Nervio Trigémino/cirugíaRESUMEN
175 matched skeletal x-ray examinations were carried out by digital luminescent radiography (DLR) and conventional screen-film system combinations. In digital luminescent radiography (DLR) two differently postprocessed images were obtained from one x-ray exposure: A display with low spatial frequency enhancement was opposed to a second display with high edge enhancement. Conventional and digital images were evaluated randomly and separately by four radiologists using a questionnaire. DLR proved to be diagnostically equivalent to the conventional technique except for a diminished visibility of subtle erosions and fissures. As major advantages of DLR maybe pointed out that faulty exposures were avoided by the automatic adjustment of image brightness and that the soft tissue margins could be more easily delineated in displays with high edge enhancement than in conventional radiography. However, digital displays with high edge enhancement did not provide additional diagnostic information and led to artifacts at the edges of metal prostheses.
Asunto(s)
Artropatías/diagnóstico por imagen , Intensificación de Imagen Radiográfica/métodos , Pantallas Intensificadoras de Rayos X , Adulto , Estudios de Evaluación como Asunto , Femenino , Humanos , Masculino , Persona de Mediana EdadRESUMEN
We report 2 cases of spontaneous thrombotic occlusion of the main renal vessels presenting with acute lumbar flank pain and hematuria suspect of nephrolithiasis. Clinical and laboratory signs of blood hypercoagulability, generalized arterial embolism, nephrotic syndrome or glomerulonephritis were absent. Excretory urography, nephrosonography and retrograde ureteropyelography showed no evidence of upper urinary tract calculi or other causes of obstruction. Renal angiography and cavography demonstrated an acute renal vein thrombosis in 1 patient and a thrombotic occlusion of all but one of the segmental renal arteries in the other patient. These 2 cases demonstrate that thrombotic occlusion of the renal artery or renal vein has to be considered in patients who are presenting with lumbar flank pain and hematuria, in whom the excretory urogram shows severe malfunction of one of the kidneys, and stone disease can be excluded. Renal angiography and cavography as well as CT scan should be carried out in these patients. When the disease is diagnosed at an early stage, an intra-arterial thrombolysis can be attempted.
Asunto(s)
Dolor de Espalda/etiología , Hematuria/etiología , Obstrucción de la Arteria Renal/diagnóstico , Venas Renales , Trombosis/diagnóstico , Enfermedad Aguda , Adulto , Diagnóstico Diferencial , Humanos , Masculino , Obstrucción de la Arteria Renal/complicaciones , Trombosis/complicacionesRESUMEN
Chest examinations were carried out in 60 individuals using film-screen and digital storage phosphor techniques and identical radiation doses. 29 of these individuals were patients with interstitial pulmonary disease; 31 were normals. Postprocessing of the digital images was carried out with filtering using an unsharp mask and identical parameters for all patients. An ROC analysis using 10 observers showed no significant difference in the evaluation of the interstitial lung disease. Correlation analysis showed a significant positive correlation (p less than 0.001) for the findings in both techniques. Under the present circumstances, film-screen and digital storage phosphor technique are of equal value in the diagnosis of interstitial pulmonary disease.
Asunto(s)
Fibrosis Pulmonar/diagnóstico por imagen , Intensificación de Imagen Radiográfica/métodos , Pantallas Intensificadoras de Rayos X , Adulto , Estudios de Evaluación como Asunto , Femenino , Humanos , Mediciones Luminiscentes , Pulmón/diagnóstico por imagen , Masculino , Persona de Mediana Edad , Curva ROC , Intensificación de Imagen Radiográfica/instrumentación , Análisis de Regresión , Sensibilidad y Especificidad , Pantallas Intensificadoras de Rayos X/estadística & datos numéricosRESUMEN
The accuracy of quantifying the degree of vascular stenosis with color Doppler flow imaging (7.5-MHz, linear array system) was determined in an experimental study carried out on six concentric and five eccentric model stenoses (cross-sectional area reduction, 13.4%-93.8%). The measurements were made with use of pulsatile flow at four different flow rates (70.8-339.0 mL/min). The degree of stenosis was calculated from the ratio of prestenotic to intrastenotic flow velocity. The most exact measurement of the degree of stenosis could be achieved with Doppler spectral analysis by determining the maximum peak systolic velocity (r = .994, y = 0.98x - 3.2). With the velocity values derived only from the color-coded image, it was also possible to find the most exact degree of stenosis (r = .995, y = 0.99x - 2.9). For quantification of stenosis, pre- and intrastenotic Doppler spectral analysis is no longer necessary if the stenosis can be imaged sufficiently with color Doppler.
Asunto(s)
Ultrasonografía/métodos , Enfermedades Vasculares/diagnóstico por imagen , Velocidad del Flujo Sanguíneo , Constricción Patológica/diagnóstico por imagen , Humanos , Modelos Cardiovasculares , Modelos Estructurales , Flujo Pulsátil , UltrasonidoRESUMEN
Based on ROC (receiver operating characteristic) analysis, contrast perception by eight physicians engaged in x-ray diagnostics for different lengths of time was examined in respect of inversion of grey scale values of digital x-ray film images. The ROC analysis showed a significantly superior contrast perception for imaging by the negative mode (bones white) than by the positive mode (bones black). With r* = + 0.61 a positive correlation was obtained between the period of the physicians' activity in x-ray diagnostics and the difference between the areas below the ROC curves for both imaging modes. Hence, the negative mode is to be preferred for diagnostic work based on digital x-ray film images.
Asunto(s)
Curva ROC , Intensificación de Imagen Radiográfica , Percepción Visual/fisiología , HumanosRESUMEN
150 MR examinations of the upper abdomen were carried out after the oral administration of 5 ml/kg body weight of a gadolinium DTPA formulation (1.0 mmol/l, 15 g/l mannitol), with reference to the delineation of the pancrease, the liver and intra-abdominal fat. For comparison, 100 MR examinations without oral opacification of the G.I. tract were evaluated. Contrast administration resulted in a signal-intensive demonstration of the G.I. tract for all measurement sequences. The intraluminal contrast improved the distinction between normal and abnormal structures. T1 and T2 sequences and the demonstration of fat on T2-weighted series. T1-weighted series showed the best diagnostic results. In 25% there was meteorism and diarrhoea within 24 hours of the administration of the oral contrast.
Asunto(s)
Abdomen/patología , Medios de Contraste/administración & dosificación , Gadolinio , Imagen por Resonancia Magnética/métodos , Compuestos Organometálicos , Ácido Pentético , Administración Oral , Evaluación de Medicamentos , Tolerancia a Medicamentos , Ayuno , Femenino , Gadolinio DTPA , Motilidad Gastrointestinal/efectos de los fármacos , Humanos , Inyecciones Intravenosas , Masculino , Persona de Mediana EdadRESUMEN
MRI of the pelvis was performed in 17 children following surgical correction of anal and rectal atresias and in five children without ano-rectal malformations. A muscle score was used to characterize the muscles of the pelvic floor and their relationship to the rectum. There was close agreement between the MRI muscle score and clinical continence. MRI provided additional information that should improve continence following conservative and surgical treatment.
Asunto(s)
Canal Anal/anomalías , Incontinencia Fecal/diagnóstico , Imagen por Resonancia Magnética , Recto/anomalías , Recto/cirugía , Adolescente , Canal Anal/cirugía , Niño , Incontinencia Fecal/fisiopatología , Femenino , Humanos , Masculino , Músculo Liso/fisiopatología , Pelvis/fisiopatología , Periodo PosoperatorioAsunto(s)
Neoplasias de los Bronquios/diagnóstico por imagen , Linfoma no Hodgkin/diagnóstico por imagen , Recurrencia Local de Neoplasia/diagnóstico por imagen , Anciano , Neoplasias de los Bronquios/terapia , Terapia Combinada , Femenino , Humanos , Linfoma no Hodgkin/terapia , Recurrencia Local de Neoplasia/terapia , Tomografía Computarizada por Rayos XRESUMEN
30 patients with known or suspected pulmonary nodules were examined using a digital image intensifier radiography system, a conventional radiography system and a tomography of the whole lung. 73.8% of the pulmonary nodules detected with tomography were also detected with the digital system, 69.1% with the conventional system. There was no significant difference between the two systems comparing false positive and false negative diagnoses. Regarding the dose reduction to nearly 25% of that of a conventional examination the digital technique should be preferred to the conventional technique, if pulmonary nodules are suspected.
Asunto(s)
Intensificación de Imagen Radiográfica , Nódulo Pulmonar Solitario/diagnóstico por imagen , Pantallas Intensificadoras de Rayos X , Humanos , Neoplasias Pulmonares/diagnóstico por imagenRESUMEN
By using surface coils and a high resolution matrix, the images from MR tomography of small objects can be greatly improved. Normal subjects have been examined in order to demonstrate the usefulness of MR tomography for the examination of bones and soft tissues in the normal hand.