共查询到20条相似文献,搜索用时 15 毫秒
1.
Tarhan NC Yologlu Z Tutar NU Coskun M Agildere AM Arikan U 《European radiology》2000,10(10):1678-1680
We present the case of a 44-year-old woman with chondromyxoid fibroma of temporal bone origin. Since this is the least common
bone tumor of cartilaginous origin, it is highly unusual to find this tumor in the skull. In fact, the literature describes
18 cases of this form of neoplasia arising in the skull, only 4 of these having originated in the temporal bone. To date,
the radiological features of these tumors, and especially features detected using the latest imaging modalities, have not
been described in detail. This report is unique in that it is the first to present a case of chondromyxoid fibroma of the
temporal bone accompanied by detailed CT and MRI findings.
Received: 8 July 1999; Revised: 14 December 1999; Accepted: 20 December 1999 相似文献
2.
Ide C De Coene B Mailleux P Baudrez V Ossemann M Trigaux JP 《European radiology》2000,10(12):1865-1870
We present the characteristic imaging findings of hypoplasia of the internal carotid artery (ICA) in two cases, one accompanied
by an intracranial aneurysm. Finding of a diffuse luminal narrowing of the ICA on MR angiography or digital subtraction angiography
(DSA) could wrongly evoke severe acquired diseases such as dissection or atherosclerosis. Absence of associated wall thickening
and flow disturbances on color Doppler sonography (CDS) should suggest carotid hypoplasia. Confirmation of the diagnosis is
obtained by CT of the skull showing a small carotid canal. Non-invasive procedures are sufficient to differentiate this rare
congenital anomaly from acquired string signs.
Received: 25 October 1999; Revised: 27 January 2000; Accepted: 30 March 2000 相似文献
3.
The purpose of this study was to correlate the pattern of tumor extent of nasopharyngeal carcinoma at the primary site on
magnetic resonance (MR) imaging with the distribution of cervical lymph node metastasis. MR images of 32 patients with biopsy-proven
nasopharyngeal carcinoma were reviewed and classified into five patterns of tumor extent in correlation with the distribution
of cervical lymphadenopathy. The assessment of cervical lymph node metastasis was done on the basis of the computed tomography
(CT) findings. The tumor volume was also correlated with the occurrence of contralateral lymphadenopathy. Of the 32 patients,
five (16 %) presented as type 1, tumor limited to the nasopharyngeal mucosa; 12 (38 %) as type 2 a, tumor which had invaded
either lateral side but did not extend over the roof of nasopharynx; three (9 %) as type 2 b, tumor which had invaded bilaterally
across the midline but did not extend over the roof of nasopharynx; three (9 %) as type 2 c, tumor which had invaded mainly
the skull base but did not cross the midline; and nine (28 %) as type 3, tumor which had extended anteriorly to the nasal
cavity without invasion. Twenty-five patients (78 %) demonstrated cervical lymphadenopathy. Patients with type 1, type 2 b
and type 3 spread had frequent bilateral cervical lymphadenopathy; those with type 2 a had only ipsilateral lymphadenopathy.
There was statistical significance (P < 0.005) regarding the existence of contralateral lymphadenopathy with midline tumors as well as the absence of contralateral
cervical lymphadenopathy with non-midline tumors. This study therefore suggests that the distribution of metastasized lymph
nodes depends on the pattern of tumor extent at the primary site.
Received: 1 June 1999; Accepted: 11 August 1999 相似文献
4.
We report an 8-month-old infant presenting with stridor caused by a nonpalpable neck mass discovered at imaging and surgery.
The diagnosis of aberrant thymic tissue was confirmed at histopathology. The authors reviewed the literature and discuss the
embryology, imaging findings and differential diagnosis of this rare disorder.
Received: 1 July 1999; Revised: 3 September 1999; Accepted: 6 September 1999 相似文献
5.
Virtual computed tomography colonoscopy: artifacts, image quality and radiation dose load in a cadaver study 总被引:2,自引:0,他引:2
Springer P Stöhr B Giacomuzzi SM Bodner G Klingler A Jaschke W zur Nedden D 《European radiology》2000,10(1):183-187
The purpose of our study was to evaluate the interdependency of spatial resolution, image reconstruction artifacts, and radiation
doses in virtual CT colonoscopy by comparing various CT scanning protocols. A pig's colon with several artificial polypoid
lesions was imaged after air insufflation with helical CT scanning using 1-, 3-, and 5-mm collimation, and pitch values varying
from 1.0 to 3.0. Virtual endoscopic images and “fly through” sequences were calculated on a Sun Sparc 20 workstation (Navigator
Software, GE Medical Systems, Milwaukee, Wis.). Several reconstruction artifacts as well as overall image quality were evaluated
by three independent reviewers. In addition, radiation doses for the different CT protocols were measured as multiple-scan
average dose using a 10-cm ion chamber and a standard Plexiglass body phantom. Generally, image quality and reconstruction
artifacts were less affected by pitch values than by beam collimation. Thus, narrow beam collimation at higher pitch values
(e. g. 3 mm/2.0) seems to be a reasonable compromise between quality of virtual endoscopic images and radiation dose load.
Received: 4 February 1999; Revised: 16 June 1999; Accepted: 17 June 1999 相似文献
6.
Precision of tibial cartilage morphometry with a coronal water-excitation MR sequence 总被引:3,自引:0,他引:3
Hyhlik-Dürr A Faber S Burgkart R Stammberger T Maag KP Englmeier KH Reiser M Eckstein F 《European radiology》2000,10(2):297-303
The aim of this study was to analyze the precision of tibial cartilage morphometry, by using a fast, coronal water-excitation
sequence with high spatial resolution, to compare the reproducibility of 3D thickness vs volume estimates, and to test the
technique in patients with severe osteoarthritis. The tibiae of 8 healthy volunteers and 3 patients selected for total knee
arthroplasty were imaged repeatedly with a water-excitation sequence (image time 6 h 19 min, resolution 1.2 × 0.31 × 0.31
mm3), with the knee being repositioned between each replicate acquisition. After 3D reconstruction, the cartilage volume, the
mean, and the maximal tibial cartilage thickness were determined by 3D Euclidean distance transformation. In the volunteers,
the precision of the volume measurements was 2.3 % (CV%) in the medial and 2.6 % in the lateral tibia. The reproducibility
of the mean cartilage thickness was similar (2.6 and 2.5 %, respectively), and that of the maximal thickness lower (6.5 and
4.4 %). The patients showed a considerable reduction in volume and thickness, the precision being comparable with that in
the volunteers. We find that, using a new imaging protocol and computational algorithm, it is possible to determine tibial
cartilage morphometry with high precision in healthy individuals as well as in patients with osteoarthritis.
Received: 15 June 1999; Revised: 7 September 1999; Accepted: 10 September 1999 相似文献
7.
Mortelé B Lemmerling M Mortelé K Verstraete K Defreyne L Kunnen M Vandekerckhove T 《European radiology》2000,10(6):967-969
A case of cervical chordoma in a 36-year-old white man with hypoesthesia in the neck and right shoulder, neck pain, and restricted
neck mobility is presented. Plain radiographs of the cervical spine showed radiolucency of the body of C2 on the right side
and enlargement of the right intervertebral foramen at C2–C3 level. Tumor encasement of the vertebral artery was demonstrated
by MR imaging and confirmed by conventional arteriography. This proved to be particularly important for preoperative assessment.
Received: 8 February 1999; Revised: 26 October 1999; Accepted: 18 November 1999 相似文献
8.
Villeirs G Van Damme S Heydanus R Serreyn R Kunnen M Mortier M 《European radiology》2000,10(3):527-530
Fat necrosis of the breast is a well-known complication following trauma, surgery, or radiotherapy. The present paper describes
a rare case of fat necrosis after heparin-induced thrombocytopenia. The mammographic, sonographic, and MR evaluation and pathologic
correlation after a 1-year follow-up period are reported.
Received: 21 January 1999; Revision received: 3 June 1999; Accepted: 5 July 1999 相似文献
9.
Three-dimensional reconstructed rotational digital subtraction angiography in planning treatment of intracranial aneurysms 总被引:21,自引:0,他引:21
We evaluated three-dimensional (3D) reconstructions of 200 ° rotational digital subtraction angiography (DSA) images for
their contributions to improving the safety of endovascular embolization of intracranial aneurysms. Standard DSA and 200 °
rotational DSA were performed in 40 adult patients (aged 21–77 years) with 45 intracranial aneurysms. Information obtainable
from standard DSA and 3D-DSA images about aneurysm shape and size was compared. In 40 (89 %) of the 45 aneurysms 3D-DSA gave
additional information about the anatomy of the aneurysm. In 17 (43 %) of these cases aneurysm anatomy could be visualized
better on 3D-DSA than on standard DSA images. In three cases only 3D-DSA images showed blood vessels originating from the
aneurysm. Reconstructed 3D images were also helpful in visualizing partially clipped aneurysms. On maximum-intensity projection
images it was even possible to depict previously embolized aneurysms. Blood vessels originating from the aneurysm are visible
on 3D-DSA images, and even previously clipped aneurysms can be visualized well. Rotational DSA with 3D reconstruction is a
helpful tool in the assessment of intracranial aneurysms.
Received: 7 September 1999; Revised: 26 November 1999; Accepted: 26 November 1999 相似文献
10.
Sakellariou P Protopapas A Kyritsis N Voulgaris Z Papaspirou E Diakomanolis E 《European radiology》2000,10(6):906-908
Mesodermal tumors of the urinary bladder are rare and the majority of them are malignant. We report a case of an intramural
leiomyoma of the bladder presenting with symptoms of a mild lower urinary tract infection. The patient was managed with partial
cystectomy and the outcome was excellent.
Received: 31 May 1999; Revised: 21 September 1999; Accepted: 21 September 1999 相似文献
11.
Vanrietvelde F Lemmerling M Mespreuve M Crevits L De Reuck J Kunnen M 《European radiology》2000,10(4):576-578
The clinical, biochemical and magnetic resonance imaging findings of two patients with cerebrotendinous xanthomatosis are
reported. This is a rare hereditary disease. Early recognition of this entity is important in view of the existing treatment
possibilities. Magnetic resonance imaging findings typically include a bilateral and almost symmetrical increase of the signal
intensity on the T2-weighted images in the cerebellar and periventricular cerebral white matter, the basal ganglia, the dentate
nuclei and the brainstem as well as cerebellar and cerebral atrophy.
Received: 18 January 1999; Revised: 3 June 1999; Accepted: 7 June 1999 相似文献
12.
A case of isolated bilateral xanthogranulomatous perinephritis, which presented as a symmetrical irregular perirenal rim
of soft tissue, is reported. Differential diagnosis and image features on ultrasound, computed tomography, and magnetic resonance
are discussed.
Received: 20 May 1999; Revised: 20 July 1999; Accepted: 22 July 1999 相似文献
13.
A patient with neurofibromatosis type 1 was found to have an enhancing mass in the hypothalamus and in the anterior optic
pathway. A 3-month MR study showed a reduction in the size and enhancement of the mass. At a 9-month MR follow-up the mass
disappeared and ceased to enhance. This report shows the unusual behaviour of a hypothalamic/chiasmatic mass confirming that
in such asymptomatic cases the conservative management can be considered the treatment of choice.
Received: 27 July 1999; Revised: 20 October 1999; Accepted: 19 November 1999 相似文献
14.
A series of moyamoya patients is presented. Angiographic findings, outcome of revascularization surgery and a young case
with moyamoya disease and hyperphosphatemia are reported. Thirteen patients (6 males and 7 females; age range 2–50 years)
were included in the study group. Findings of the patients at presentation were intracranial haemorrhage in two adult cases
and sequelae of cerebral ischemia in the rest of the group. One young girl had hyperphosphataemia. Angiography showed distal
internal carotid or proximal anterior and middle cerebral artery stenosis, unique collaterals, microaneurysm of the posterior
lateral choroidal artery and flow-related changes in the posterior circulation. In 3 patients, encephalo-duro-arterio-synangiosis
(EDAS) and burrholes were performed at surgery. Follow-up angiograms of these patients showed revascularization. Moyamoya,
a rare but potentially devastating disease, must be addressed as a cause of haemorrhagic and ischaemic cerebral events.
Received: 19 January 1999; Revised: 14 April 1999; Accepted: 17 May 1999 相似文献
15.
Coronary arteriovenous fistula are uncommon if not rare, but represent the most prevalent hemodynamically significant congenital
malformations of the coronary arterial circulation. The goal of this report is to evaluate the use of 3D volume rendering
from transaxial breathhold coronary MR angiograms to visualize coronary arteriovenous fistulas. Coronary MR angiography offers
a new non-invasive technique that accurately defines the anatomy of these malformations, setting the stage for surgical intervention.
Received: 15 July 1999; Revised: 13 October 1999; Accepted: 15 October 1999 相似文献
16.
Gallstone ileus: CT findings 总被引:6,自引:0,他引:6
Gallstone ileus is a rare complication of recurrent gallstone cholecystitis. The classic radiographic triad of small bowel
obstruction, pneumobilia and ectopic gallstone on abdominal plain radiograph is described with CT imaging. Because of the
better resolution of CT compared with abdominal radiography and its recent accession to emergency use, radiologists should
be aware of CT findings of gallstone ileus. We report a case in which gallstone ileus was initially diagnosed by CT.
Received: 30 July 1999; Revised: 18 October 1999; Accepted: 18 October 1999 相似文献
17.
Axillary lymph node metastases in breast cancer: preoperative detection with dynamic contrast-enhanced MRI 总被引:7,自引:0,他引:7
Kvistad KA Rydland J Smethurst HB Lundgren S Fjøsne HE Haraldseth O 《European radiology》2000,10(9):1464-1471
Metastatic involvement of axillary lymph nodes is one of the most important prognostic variables in breast cancer. The aim
of our work was to study the value of dynamic contrast-enhanced MR imaging in revealing axillary lymph node metastases from
breast cancer. A total of 65 patients with invasive breast cancer treated with axillary lymph node dissection were preoperatively
evaluated by MRI. T1-weighted dynamic contrast-enhanced 3D images were acquired using a coil covering the breast and the axilla.
The dynamic contrast enhancement, size, and morphology of the axillary lymph nodes were registered. Histopathological examination
revealed axillary lymph node metastases in 24 patients. When using a signal intensity increase in the lymph nodes of > 100
% during the first postcontrast image as a threshold for malignancy, 57 of 65 patients were correctly classified (sensitivity
83 %, specificity 90 %, accuracy 88 %). These results were not improved when lymph node size and morphology were used as additional
criteria. Axillary lymph nodes can be evaluated as a part of an MR-mammography study without substantial increase in examination
time, and provide the surgeon with knowledge about the localization of possible metastatic lymph nodes.
Received: 25 February 1999; Revised: 3 August 1999; Accepted: 27 January 1999 相似文献
18.
A 53-year-old-man underwent US-guided percutaneous thermal ablation with a cooled-tip needle of three liver metastases from
gastric cancer. Six days later, the patient was re-admitted for melena, scleral jaundice, and anemia. Abdominal US disclosed
echogenic material in the gallbladder lumen (hemobilia) and a focal lesion with mixed echotexture in segment III (hepatic
hematoma). On day 5 portal cavernomatosis was diagnosed at US and confirmed by color Doppler and a helical CT exam. The case
described emphasizes that radio-frequency interstitial hyperthermia may cause not only traumatic injury of the liver parenchyma
but also thermally mediated damage of vascular structures.
Received: 14 January 1999; Revised: 21 May 1999; Accepted: 9 June 1999 相似文献
19.
We report the case of a 60-year-old woman with a recent history of a cerebrovascular accident. Because of clinical suspicion
of pulmonary embolism and negative Doppler ultrasound findings of the lower limbs, spiral computed tomography of the pulmonary
artery was performed and demonstrated pulmonary emboli. We emphasize the role of computed tomography of the abdomen, performed
3 min after the thoracic acquisition, which showed an unsuspected thrombus within the abdominal aorta and the left renal artery
with infarction of the left kidney. Paradoxical embolism was highly suspected on computed tomography data and confirmed by
echocardiography which demonstrated a patent foramen ovale.
Received: 23 April 1999; Revised: 17 August 1999; Accepted: 18 August 1999 相似文献
20.
Symptoms due to thoracic outlet syndrome may present only in abduction, a position that cannot be investigated in conventional
MR scanners. Therefore, this study was initiated to test MRI in an open magnet as a method for diagnosis of thoracic outlet
syndrome. Ten volunteers and 7 patients with a clinical suspicion of thoracic outlet syndrome were investigated at 0.5 T in
an open MR scanner. Sagittal 3D SPGR acquisitions were made in 0 and 90 ° abduction. In the patients, a similar data set was
also obtained in maximal abduction. To assess compression, the minimum distance between the first rib and the clavicle, measured
in a sagittal plane, was determined. In the neutral position, no significant difference was found between patients and controls.
In 90 ° abduction, the patients had significantly smaller distance between rib and clavicle than the controls (14 vs 29 mm;
p < 0.01). On coronal reformatted images, the compression of the brachial plexus could often be visualised in abduction. Functional
MR examination seems to be a useful diagnostic tool in thoracic outlet syndrome. Examination in abduction, which is feasible
in an open scanner, is essential for the diagnosis.
Received: 22 February 1999; Revised: 15 June 1999; Accepted: 30 June 1999 相似文献