共查询到20条相似文献,搜索用时 31 毫秒
1.
J. F. Schlund R. C. Semelka U. Kettritz S. M. Weeks M. Kahlenberg W. G. Cance 《Abdominal imaging》1996,21(1):49-52
Background: The purpose of this study was to evaluate patients with wedge-shaped perfusion defects seen on spiral CT arterial portography
for the presence of transient increased wedge-shaped enhancement on dynamic gadolinium-enhanced gradient echo MR images.
Methods: Nineteen patients underwent CTAP and MRI within a 2-week interval. All patients with wedge-shaped perfusion defects on CT
arterial portography were evaluated in a separate review session for the presence of transient increased segmental hepatic
enhancement on dynamic gadolinium-enhanced spoiled gradient echo (SGE) MR images.
Results: Eight patients were identified to have subsegmental, segmental, or lobar wedge-shaped perfusion defects by CT arterial portography.
In 8/8 patients, there was transient wedge-shaped increased hepatic enhancement on MR images which corresponded to the perfusion
defects identified on CT arterial portography. Transient increased enhancement on MR images was observed on immediate postgadolinium
images as high-signal intensity of the involved subsegment, segment, or lobe. This relatively high-signal area faded to near
isointensity in all cases on images obtained at 45 s.
Conclusion: Wedge-shaped perfusion defects demonstrated by CT arterial portography corresponded to wedge-shaped increased hepatic enhancement
following gadolinium administration on SGE MR images.
Received: 29 December 1994/Accepted: 7 February 1995 相似文献
2.
B. I. Choi Y. M. Shin J. K. Han J. W. Chung J. H. Park M. C. Han 《Abdominal imaging》1996,21(1):33-36
Background: The objective of this study was to determine if spiral computed tomography (CT) results in increased rate of detection of
focal hepatic nodules containing iodized oil after transcatheter oily chemoembolization when compared with conventional CT.
Methods: Spiral CT with single 24-s breath-hold technique was compared with conventional sequential CT in 42 patients with suspected
hepatocellular carcinomas. Two sets of CT scans obtained after transcatheter oily chemoembolization were independently reviewed
by two radiologists. The slice thickness was 10 mm for both data sets. The number and sizes of focal hepatic nodules containing
iodized oil were documented. All 42 patients had at least one hepatic nodule. The lesion size varied from 2 mm to 12 cm.
Results: In six of the 42 patients, more hepatic nodules could be identified on spiral CT compared with conventional CT. When scans
with spiral CT were used, 107 nodules were detected, whereas 98 nodules were detected with conventional CT. Overall, nine
(9%) more nodules were detected with spiral CT (<+>p= .002). If lesions larger than 2 cm are excluded, nine (15%) more lesions were detected with spiral CT (<+>p= .002).
Conclusion: Spiral CT results in increased rate of detection of focal hepatic nodules after transcatheter oily chemoembolization, particularly
in lesions smaller than 2 cm.
Received: 11 October 1994/Accepted: 6 November 1994 相似文献
3.
R. H. Wachsberg C. D. Levine K. C. Cho M. Z. Simmons M. Y. Khan B. Koneru 《Abdominal imaging》1996,21(3):219-221
On magnetic resonance imaging (MRI) studies, wedge-shaped areas of signal abnormality noted in association with liver lesions
have been attributed to secondary phenomena and are said to be substantially larger than the actual tumor. We describe the
MRI and pathological appearance of a wedge-shaped cholangiocarcinoma. In cases where therapy might be affected, biopsy of
wedge-shaped MRI abnormalities associated with hepatic malignancy should be considered for accurate tumor staging.
Received: 23 December 1994/Accepted: 25 January 1995 相似文献
4.
Background: The purpose of this study was to evaluate the usefulness of color Doppler imaging (CDI) in suspected cases of acute cholecystitis.
Methods: Twenty-two patients suspected of having acute cholecystitis were prospectively evaluated over a 12-month period using gray-scale
and color Doppler technique. Gallbladder wall thickness was greater than 2 mm in all patients included in the study. Pathologic
correlation was obtained in 17 patients, with clinical or sonographic follow-up in five for a period of 6<+>–/011001/months.
CDI was considered positive only if the mid to fundal wall demonstrated flow. Sonographic Murphy's sign and laboratory values
were recorded.
Results: Eight patients had acute cholecystitis. All had positive color Doppler flow. Wall thickness in these patients ranged between
4 and 10 mm. Three patients with necrotizing acute cholecystitis had no flow within 6<+>–<+>8-mm walls. Six patients with
pathologically proven chronic cholecystitis had no evidence of increased flow within thickened walls. Five patients with presumed
chronic cholecystitis (thickened wall without increased color flow) were treated medically, and their symptoms resolved. CDI
was more sensitive in predicting acute cholecystitis than was the sonographic Murphy's sign and/or laboratory values.
Conclusion: CDI demonstrates hyperemic changes in thickened gallbladder walls and is an important adjunct in the diagnosis of acute cholecystitis.
Received: 3 February 1995/Accepted: 24 March 1995 相似文献
5.
H. Honda T. Hayashi K. Yoshida K. Takenaka K. Kaneko T. Fukuya Y. Tateshi T. Ro T. Maeda K. Masuda 《Abdominal imaging》1996,21(1):37-40
Background: Because of its poor prognosis, the diagnosis of hepatocellular carcinoma with sarcomatous change (HCCSC) is clinically important.
The purpose of this study is to elucidate the characteristic CT findings of HCCSC.
Methods: Two-phased dynamic incremental CT images of six histologically proven HCCSC were retrospectively reviewed.
Results: All tumors (100%) exhibited peripheral enhancement on delayed CT images. Lymphadenopathy was observed in 100% (six of six
patients); intrahepatic metastases, in 83% (five of six). Both metastatic lesions showed findings similar to those of the
primary hepatic tumors, such as peripheral enhancement. Histopathologically, delayed and/or prolonged peripherally enhanced
areas consisted of viable cancer cells with sarcomatous changes.
Conclusions: The appearance of HCCSC on CT is that of an irregularly demarcated intrahepatic mass with delayed or prolonged peripheral
enhancement, frequently with intrahepatic metastases and lymphadenopathy.
Received: 5 December 1994/Accepted: 4 January 1995 相似文献
6.
Background: To assess the accuracy of computed tomographic (CT) imaging in the detection of spread and staging of gallbladder carcinoma.
Methods: CT findings of spread of gallbladder carcinoma in 59 Japanese patients who underwent radical surgery were correlated retrospectively
with pathologic findings.
Results: The incidence of histologically proven nodal involvement was 54% (32 patients) and the most common spread of gallbladder
carcinoma. The sensitivities in CT detection of N1 and N2 nodal involvement were 36% and 47%, respectively; positive predictive
values were 94% and 92%, respectively. Direct extension to the liver, extrahepatic bile duct, and gastrointestinal tract or
pancreas were histologically confirmed in 24, 18, and five patients. The sensitivities in the CT detection of direct spread
to the liver of less than 2 cm, more than 2 cm, the extrahepatic bile duct, and the gastrointestinal tract or pancreas were
65%, 100%, 50%, and 57%, respectively; positive predictive values were 77%, 100%, 90%, and 100%, respectively. The incidence
of liver metastases and involvement of interaortocaval nodes were 7% and 16%, respectively. The sensitivities in CT detection
of liver metastases and involvement of interaortocaval nodes were 75% and 21%, respectively; positive predictive values were
100% and 86%, respectively. CT could not detect direct spread to omentum and peritoneal seedings.
Conclusion: For detecting the spread of gallbladder carcinoma, CT imaging has low to moderate sensitivity; however, CT imaging can help
in determining resectability and in planning the treatment, especially in advanced-stage gallbladder carcinoma, because of
a high positive predictive value.
Received: 5 July 1995/Accepted: 8 August 1995 相似文献
7.
P. Prassopoulos N. Charoulakis P. Anezinis G. Daskalopoulos A. Cranidis N. Gourtsoyiannis 《Abdominal imaging》1996,21(1):75-77
The reliability of suprapubic ultrasonography (SU) in assessing the size of the prostate was examined in 95 patients with
benign prostatic hyperplasia (BPH). Volumetric measurements of the prostate and the transition zone of the prostate (TZP)
performed by SU were compared with corresponding measurements obtained by transrectal ultrasonography (TU). A very strong
correlation was found between suprapubically and transrectally performed measurements for both the total prostate gland (r= 0.948, p < 0.001) and the TZP volume (r= 0.953, p < 0.001). According to the results of this study, SU appears to be as reliable as TU in assessing the size of the prostate
and the TZP and may be used effectively in the evaluation of patients with BPH, as it is less cumbersome, better tolerated,
and a widely available examination technique.
Received: 21 October 1994/Accepted after revision: 12 December 1994 相似文献
8.
Koizumi J Kurata T Yamashita T Kominami M Fujiwara H Narimatsu Y Hiramatsu K 《Abdominal imaging》2000,25(6):583-586
Background: Computed tomography during arterial portography (CTAP) under temporary balloon occlusion of the hepatic artery (BOHA-CTAP)
was introduced to evaluate pseudolesions caused by portal venous impairments such as arterioportal shunt and tumor thrombus.
Methods: BOHA-CTAP was performed in seven patients with hepatocellular carcinoma and correlated with clinical outcomes. For patients
with wedge-shaped defects suggestive of pseudolesions, BOHA-CTAP was obtained by a 5-F balloon occlusion catheter into the
proper hepatic artery through the second 5-F introducer inserted into the common femoral artery a few centimeters below the
first 5-F sheath for CTAP.
Results: Eight pseudolesions were determined clinically on follow-up CT, ultrasonography, or magnetic resonance imagings. On BOHA-CTAP,
five of the eight pseudolesions were eliminated, and two were diminished in comparision with conventional CTAP. One wedge-shaped
defect due to tumor thrombus in the portal vein did not show any change.
Conclusion: BOHA-CTAP can reduce pseudolesions caused by portal venous impairments and enable the demarcation of the true tumors. RID="
ID=" <E5>Correspondence to:</E5> J. Koizumi
Received: 3 August 1999/Revision accepted: 8 March 2000 相似文献
9.
M. Okada T. Shirotani T. Sakurai T. Yao M. Seo Y. Okada K. Sakamoto K. Tanaka 《Abdominal imaging》1996,21(2):133-141
Background: To clarify the radiographic characteristics of intractable gastric ulcers with H2-receptor antagonists.
Methods: The radiographic findings at the time of starting treatment were compared between 42 patients with gastric ulcers that did
not heal within eight weeks of starting treatment with H2-receptor antagonists (the intractable group) and 58 patients whose ulcers healed within the eight-week period (the tractable
group).
Results: The following radiographic findings in the intractable group were observed at a significantly higher incidence than those
in the tractable group and included: an ulcer located on the angle, linear ulcers, a greater depth, an uneven mound surrounding
an ulcer, prominent folds' convergence, an overhanging gastric mucosa, an irregular ulcer base, a shortening of the lesser
curvature and a U-shaped deformity of the angle. A multiple logistic regression analysis showed that the following three factors
had a significant and independent delaying effect on healing: a U-shaped deformity of the angle, an uneven mound surrounding
an ulcer and prominent folds' convergence. The relative risk of these factors were 12.7, 14.4 and 12.5, respectively.
Conclusions: Intractable gastric ulcer with H2-receptor antagonists can be predicted based on the characteristic radiographic findings at the start of treatment.
Received: 23 December 1994/Accepted: 25 January 1995 相似文献
10.
M. Pizzamiglio C. Catalano A. Sarrantonio P. Pavone A. Pronio C. Montesani G. Ribotta R. Passariello 《Abdominal imaging》1996,21(3):261-265
Background: Restorative proctocolectomy with ileal pouch has become the surgical treatment of choice for patients with ulcerative colitis
(UC) and familial polyposis of the colon. Defecography is the radiological technique commonly employed to obtain detailed
information on function and morphology of the ileal pouch; it allows the direct visualization of the ileal pouch and the anal
canal, but it does not provide the visualization of the pelvis.
Methods: In all patients, computed tomography (CT) on coronal planes was performed to determine its possibilities as an alternative
to defecography; 10 patients with UC submitted to restorative proctocolectomy and were examined.
Results: Coronal CT images provided a panoramic vision of the pelvis and demonstrated the morphology of the ileal pouch, the thickness
of its walls, and its correlation with the surrounding tissues. Coronal CT also allowed the evaluation of the continence of
ileo-anal and ileo-ileal anastomosis and the functional changes of the perineal muscles at rest and during squeezing.
Conclusion: CT images acquired on coronal planes allows an easy and clear detection of the major postoperative complications, such as
stenosis or dehiscences of the anastomosis, pelvic phlogosis, and fistulae.
Received: 29 December 1994/Accepted: 5 February 1995 相似文献
11.
R. Feld R. J. Wechsler J. Z. Dumsha S. Westerberg S. Munoz I. Boiskin R. Rubin 《Abdominal imaging》1996,21(2):161-165
Background: To evaluate the clinical significance of the computed tomographic finding of subcapsular hepatic necrosis following liver
transplantation.
Methods: 105 computed tomography scans performed in 50 allografts, 6 days to 4 years following transplantation, were retrospectively
reviewed and divided into two groups: those with and those without the computed tomographic finding of subcapsular hepatic
necrosis. Extrahepatic fluid, biliary dilatation, circumcaval rings, periportal collar, biochemistry, and random biopsies
were correlated with the computed tomographic finding of subcapsular hepatic necrosis.
Results: Computed tomographic finding of subcapsular hepatic necrosis was demonstrated at some point in 21 (42%) patients and was
never demonstrated in 29 (58%) patients. The association of periportal collar with the computed tomographic finding of subcapsular
hepatic necrosis was significant; there was no significant association with other computed tomographic findings. There was
no significant difference in serum transaminases between the two groups. There was no significant difference in necrosis on
biopsy between the two groups; however, the association of acute cellular rejection with the computed tomographic finding
of subcapsular hepatic necrosis was significant.
Conclusions: Computed tomographic finding of subcapsular hepatic necrosis is a common finding following liver transplantation, which has
little clinical prognostic significance.
Received: 13 December 1994/Accepted: 5 January 1995 相似文献
12.
We report on three patients with large lipomas in the wall of the cecum, causing intussusception. Endoscopy is the preferred
modality for small lipomas, whereas CT and MR imaging are more useful in their ability in detecting fatty masses and assessing
the location of lesions. Barium enema study may contribute to the preoperative planning in selected cases.
Received: 1 November 1994/Accepted after revision: 5 January 1995 相似文献
13.
Current status of small bowel radiography 总被引:14,自引:0,他引:14
D. D. T. Maglinte F. M. Kelvin K. O'Connor J. C. Lappas S. M. Chernish 《Abdominal imaging》1996,21(3):247-257
Background: In the past, small bowel examinations were usually ordered for the sake of ``completeness.' As a result, small bowel radiography
was performed casually and without attention to detail. This review examines pertinent clinical issues and the recent contribution
of small bowel radiography to the evaluation and management of the patient with suspected small bowel disease. Recommendations
for the clinical utilization of small bowel radiography are discussed.
Methods: Analysis of pertinent citations addressing valid indications for, and technique of, small bowel radiography from 1980 to
July 1995 through a computerized bibliographic search (Medline and Current Contents).
Results: Accepted clinical indications for small bowel radiography include (1) unexplained gastrointestinal bleeding, (2) possible
small bowel tumor, (3) small bowel obstruction, (4) Crohn disease, and (5) malabsorption. The current literature reflects
the limitations of the conventional small bowel follow-through, various modifications to improve its clinical yield, the important
contribution of enteroclysis in the workup, and subsequent management of patients with possible small bowel disease. A controversy
in the radiology literature exists as to whether to use the small bowel follow-through or enteroclysis as the primary method
of examining the small bowel.
Conclusion: The thoughtful selection of patients by clinicians for small bowel radiography is essential to make radiologic evaluation
cost effective. The incidence of disease of the small intestine is low and is associated with nonspecific symptoms. Because
of the inherent difficulty of visualizing numerous loops of an actively peristalsing bowel, a reliable imaging method is needed
that not only detects small or early structural abnormality but also accurately documents normalcy. The yield of information
provided by enteroclysis and its high negative predictive value suggests that it should be the primary method for small bowel
examination. The ``overhead'-based conventional small bowel follow-through should be abandoned. The ``fluoroscopy'-based
small bowel follow-through augmented when necessary by the peroral pneumocolon or the gas-enhanced double-contrast follow-through
method is an acceptable alternative when enteroclysis is not possible.
Received: 0/0/00Accepted: 0/0/00 相似文献
14.
T. Fukuda I. Sakamoto S. Kohzaki M. Uetani M. Mori T. Fujimoto K. Hayashi S. Matsuo 《Abdominal imaging》1996,21(1):58-61
We reviewed the clinical and radiological features in eight patients with spontaneous rectus sheath hematoma (RSH). The diagnosis
was confirmed at surgery in four patients, and spontaneous resolution occurred in the other four. All patients were elderly
adults. Acute abdominal pain and a palpable mass after muscular strain, such as coughing or twisting, were features highly
suggestive of RSH. Sonographically, these hematomas may be confused with abdominal wall tumors. On CT scans, a hyperdense
mass posterior to the rectus abdominis muscle with ipsilateral anterolateral muscular enlargement is considered characteristic
of acute RSH, although chronic RSH may be isodense or hypodense relative to the surrounding muscle. MRI is very useful in
the diagnosis of RSH, which is demonstrated as a high signal intensity area on both T1- and T2-weighted images, especially
when the CT findings are not specific for RSH.
Received: 16 August 1994/Accepted: 3 October 1994 相似文献
15.
目的 观察卵巢癌脾脏转移瘤的18F-FDG PET/CT表现。方法 回顾性分析经病理及临床随访证实的21例卵巢癌脾脏转移瘤患者的18F-FDG PET/CT表现,分析病灶最大标准摄取值(SUVmax)与最大径的相关性。结果 21例中,17例单发,4例多发,共28个病灶。13个病灶18F-FDG PET/CT表现为类圆形低密度影,其中9个病灶边界清晰,4个病灶边界不清;4个病灶密度不均匀,内见坏死、囊变,余9个病灶密度均匀。15个病灶表现为类圆形等密度影,边界不清,密度均匀。28个病灶均呈18F-FDG高摄取,其中21个病灶18F-FDG摄取均匀,7个病灶18F-FDG摄取不均匀。卵巢癌脾脏转移瘤的SUVmax为8.04±3.92,最大径为(2.23±1.02) cm,SUVmax与最大径呈正相关(r=0.687,P<0.001)。21例中,5例肿瘤仅累及脾脏;16例累及其他部位。结论 卵巢癌脾脏转移瘤的18F-FDG PET/CT表现具有一定特征性。 相似文献
16.
We aimed to evaluate the imaging findings of hepatic metastases from pancreatic cancers, especially wedge-shaped enhancement and its etiology. Dynamic CT and MR images were performed in 87 patients with liver metastases from pancreatic carcinomas, and CT during arterial portography (CTAP) and CT during hepatic arteriography (CTHA) in 51 patients. Liver metastases were multiple in 84 patients (97%) and solitary in only three (3%). In 44 of 87 patients (51%), all liver metastases showed ring-like enhancement compatible with metastatic adenocarcinomas on dynamic CT and/or dynamic MR imaging. In 37 patients, more than one metastatic lesion showed wedge-shaped contrast enhancement on dynamic CT, dynamic MRI and CTHA, and wedge-shaped perfusion defect on CTAP adjacent to metastatic tumors. Six patients showed multiple wedge-shaped enhancements, which were initially diagnosed as multiple arterioportal shunts (AP shunts). However, metastatic tumors appeared within the area of wedge-shaped enhancement and increased in size on follow-up CT and/or MR images. After all, 43 of 87 patients (49%) had AP shunt like contrast enhancement adjacent to liver metastases. Liver metastases from pancreatic carcinomas frequently show transient wedge-shaped enhancement, and should not be misdiagnosed as nontumorous arterioportal shunts. 相似文献
17.
Appendiceal stump abscess 总被引:1,自引:0,他引:1
M. M. Filippi de la Palavesa D. Vaxmann M. Campos C. Tuchmann S. Guth J. L. Dietemann 《Abdominal imaging》1996,21(1):65-66
Recurrence of traditionally treated appendicitis is rarely reported but known to surgeons and is probably underestimated.
We described a case, illustrated by CT, of stump abscess 2 years after laparoscopic appendectomy. Sonography and CT are helpful
in detecting pericecal changes, but diagnosis is confirmed by laparotomy.
Received: 28 September 1994/Accepted: 22 October 1994 相似文献
18.
Occult bilateral ectopic vaginal ureters causing urinary incontinence: diagnosis by computed tomography 总被引:1,自引:0,他引:1
Diagnosis of an ectopic, infrasphincteric ureter can be difficult because the renal moiety drained by the ectopic ureter
is often small and functions poorly. We present a 6-year-old girl with urinary incontinence caused by bilateral vaginal ectopic
ureters that were not seen on excretory urography or renal sonography and were diagnosed only by contrast-enhanced computerized
tomography.
Received: 22 August 1994/Accepted after revision: 22 December 1994 相似文献
19.
A patient with gastrointestinal bleeding due to amyloidosis-related factor X deficiency had extensive calcified retroperitoneal
amyloid deposition that was visible on plain radiographs and then localized by computed tomography. The radiologic findings
were important in arriving at the proper diagnosis despite negative biopsies.
Received: 14 December 1994/Accepted: 15 January 1995 相似文献
20.
Enhancement of ascitic fluid on delayed contrast-enhanced CT has been described as a potential pitfall in diagnosis. We present
a case in which the phenomenon was beneficial to diagnosis. Enhancement of ascites was useful in delineating the entire extent
of a cystic pelvic mass. We also discuss probable molecular and histologic mechanisms responsible for this unique type of
enhancement.
Received: 8 August 1994/Accepted after revision: 17 November 1994 相似文献