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1.
A case of ossified leiomyoma of the deep soft tissues of the left thigh is presented. The radiographic appearance suggested
a low-grade chondrosarcoma. MRI of the lesion showed signal characteristics similar to muscle on both T1- and T2-weighted
spin echo sequences with linear areas of high signal intensity on T1-weighted images consistent with medullary fat in metaplastic
bone. Histopathological examination of the resected specimen revealed a benign ossified soft tissue leiomyoma.
Received: 23 December 1998 Revision requested: 31 January 1999 Revision received: 11 March 1999 Accepted: 16 March 1999 相似文献
2.
Solid aneurysmal bone cyst in the humerus 总被引:1,自引:0,他引:1
We report on a 69-year-old woman with a solid variant of aneurysmal bone cyst (solid ABC) in the left humerus with a pathological
fracture. Radiographically, the lesion exhibited a relatively well-defined osteolytic lesion in the diaphysis of the left
humerus. On magnetic resonance (MR) imaging, the medullary lesion exhibited a homogeneous signal intensity isointense with
surrounding normal muscles on the T1-weighted images and a mixture of low and high signal intensity on the T2-weighted images.
Contrast-enhanced T1-weighted images revealed diffuse enhancement of the entire lesion. The pathological study showed a proliferation
of fibroblasts, histiocytes, chronic inflammatory cells and numerous multinucleated giant cells in a collagenous matrix. Abundant
osteoid formation in the matrix was observed, but the cells were devoid of nuclear atypia. Aneurysmal cystic cavities were
absent. A review of the English literature found 22 cases of solid ABC of the long bones.
Received: 15 February 2000 Revision requested: 18 March 2000 Revision received: 17 April 2000 Accepted: 19 April 2000 相似文献
3.
Juxta-articular hemangioma of long bone 总被引:1,自引:0,他引:1
We report on a rare case of an intraosseous hemangioma involving the proximal tibia in a 70-year-old man. Radiographically,
the lesion was a well-defined osteolytic lesion with marginal sclerosis. The CT images demonstrated a well-defined osteolytic
lesion with partial cortical breakthrough. T1-weighted MR images showed a hypointense lesion, while T2-weighted images revealed
hyperintense areas, with internal, hypointense septa. Gadolinium-enhanced T1-weighted images showed lattice-like enhancement
of the lesion.
Received: 28 December 1999 Revision requested: 3 March 2000 Revision received: 23 May 2000 Accepted: 26 May 2000 相似文献
4.
Yoshioka H Itai Y Niitsu M Fujiwara M Watanabe T Satomi H Otsuka F 《Skeletal radiology》1999,28(12):714-716
We present a rare case of intramuscular metastasis from malignant melanoma. The lesion showed intermediate to high signal
intensity on T1-weighted magnetic resonance (MR) images and mixed signal intensities containing high and low signals on T2-weighted
images. The signal intensity on T1-weighted images, which is due to the paramagnetic effect of melanin, is a characteristic
MR finding of this entity.
Received: 10 June 1999 Revision requested: 7 July 1999 Revision received: 9 August 1999 Accepted: 9 August 1999 相似文献
5.
Diabetic muscle infarction: atypical MR appearance 总被引:4,自引:0,他引:4
We describe a case of diabetic muscle infarction which had atypical features of hyperintensity of the affected muscle on T1-weighted
images. Biopsy was performed which revealed diffuse extensive hemorrhage within the infarcted muscle. We believe increased
signal intensity on T1-weighted images should suggest hemorrhage within the infarcted muscle.
Received: 8 March 2000 Revision requested: 14 April 2000 Revision received: 5 May 2000 Accepted: 11 May 2000 相似文献
6.
An 18-year-old woman presented with left elbow joint pain. Radiographs and computed tomographic scan showed a well-defined
osteolytic lesion of the left ulna associated with a honeycomb appearance on the radiographs. Magnetic resonance images showed
intermediate signal intensity on T1-weighted images and mixed intermediate and high signal intensities on T2-weighted images.
Only the periphery of the lesion enhanced with intravenously injected gadolinium-diethylenetriamine pentaacetic acid. The
lesion was curetted to avoid pathologic fracture, and a histologic diagnosis of cavernous hemangioma of bone was made. Hemangioma
involving the ulna is rare, but should be included in the differential diagnosis of a radiographic osteolytic lesion with
a honeycomb appearance.
Received: 17 September 1999 Revision requested: 31 October 1999 Revision received: 10 December 1999 Accepted: 13 December
1999 相似文献
7.
Patankar T Krishnan A Patkar D Kale H Prasad S Shah J Castillo M 《Skeletal radiology》2000,29(7):392-396
Objective. To review imaging studies of isolated involvement of the sacrum due to tuberculosis and determine the role of imaging in
the diagnosis and management of these patients.
Design and patients. A retrospective analysis of 15 cases of isolated sacral tuberculosis imaged with MR imaging was performed. The CT images
were also reviewed where available, and the various lesion characteristics were identified. We also reviewed the medical records
in an attempt to determine the impact of the imaging studies on the management of these patients.
Results. Fifteen patients (5 male, 10 female) presented with symptoms of 3–15 months’ duration. Chronic localized backache with muscle
spasm was the commonest presenting symptom; discharging sinuses with abscess formation was found in six patients, five of
whom were children. MR imaging of the sacrum revealed a hypointense marrow signal on T1-weighted images and hyperintense signal
on T2-weighted images in 14 of 15 patients, the S2 vertebra being always involved. CT revealed osteolytic changes in the sacrum
in all the five patients in whom CT was performed. All patients showed marked clinical improvement within 1 year of anti-tuberculous
chemotherapy.
Conclusion. Isolated tuberculosis of the sacrum is uncommon but should be suspected in patients presenting with chronic low backache
or children with discharging sinuses/abscesses and showing sacral destruction on CT or MR imaging. MR imaging can identify
cases and enables early institution of anti- tuberculous chemotherapy.
Received: 31 August 1999 Revision requested: 1 November 1999 Revision received: 27 March 2000 Accepted: 14 April 2000 相似文献
8.
This case report describes a patient with acute retrocalcaneal bursitis, which developed after MRI examination of the ankle.
The sagittal T2*-weighted gradient echo sequence revealed an extensive susceptibility artifact in the area surrounding the
Achilles tendon near its insertion at the os calcis. This artifact was caused by postsurgical metallic particles. We postulate
that these particles were mechanically stimulated by the magnetic field and induced the inflammatory response.
Received: 20 July 1998 Revision requested: 14 September 1998, 16 March 1999 Revision received: 15 February 1999, 20 May
1999 Accepted: 21 May 1999 相似文献
9.
Juxtacortical chondromyxoid fibroma arising in an apophysis 总被引:2,自引:0,他引:2
We present a rare case of juxtacortical chondromyxoid fibroma arising in the lesser trochanter of the right femur which corresponds
to an apophysis. Radiography showed a well-defined expansive lesion with a sclerotic margin measuring 5×3.5 cm in diameter
in the lesser trochanter. On spin echo T1-weighted images, the lesion revealed low signal intensity similar to muscle. On
spin echo T2-weighted images, the lesion revealed high heterogeneous signal intensity, which after gadolinium injection showed
heterogeneous enhancement. The inner margin of the cortex was intact and adjacent bone marrow was of normal signal intensity.
The outer margin of the lesion was also clearly defined and extension into adjacent soft tissue beyond the exophytic cortical
outgrowth was not evident.
Received: 1 March 2000 Revision requested: 28 March 2000 Revision received: 1 May 2000 Accepted: 8 May 2000 相似文献
10.
Kuroda S Itoh H Yamagami T Kizu O Murata H Kusuzaki K Yamano T Maeda T 《Skeletal radiology》2000,29(5):293-297
A 41-year-old man presented with an asymptomatic mass in the right medial thigh. Magnetic resonance imaging (MRI) revealed
a well-demarcated, 10-cm mass in the right adductor muscles. The margins of the mass exhibited high signal intensity and the
rest showed low or iso signal intensity on T1-weighted MR images. However, the high signal intensity was decreased on T2-weighted
images with fat suppression. The central part of the tumor was of inhomogeneous high signal intensity on T2-weighted images;
after Gd-DTPA injection it enhanced inhomogeneously on T1-weighted images with fat suppression. On dynamic computed tomography
(CT) in the arterial phase, there were strongly enhancing spotty areas in the tumor. At surgery, a yellow-whitish tumor was
resected and a pathological diagnosis of angiomyolipoma (AML) in the thigh was made.
Received: 21 June 1999 Revision requested: 28 July 1999 Revision received: 13 December 1999 Accepted: 15 December 1999 相似文献
11.
Marginal erosive discovertebral ”Romanus” lesions in ankylosing spondylitis demonstrated by contrast enhanced Gd-DTPA magnetic resonance imaging 总被引:5,自引:0,他引:5
Objective. To assess the value of Gd-DTPA magnetic resonance (MR) imaging in the demonstration of marginal destructive discovertebral
Romanus lesions in ankylosing spondylitis.
Design and patients. A prospective study of Gd-DTPA MR imaging was performed in 39 patients with a clinical diagnosis of ankylosing spondylitis
and typical Romanus lesions seen on radiographs of the thoracolumbar spine. MR morphological appearances and signal intensity
changes at the discovertebral junctions were analysed and compared with the radiographic findings.
Results. Ninety-nine discovertebral junctions with Romanus lesions showed low signal intensity on T1-weighted and high signal on
T2-weighted and T1-weighted postcontrast images at the vertebral corners consistent with oedematous hyperaemic inflammatory
tissue. There were nine discovertebral junctions with similar MR findings but normal radiographs. Fifty-three discovertebral
junctions showed syndesmophyte formation with increased signal intensity on both T1- and T2-weighted images with no contrast
enhancement. Sixty-five discovertebral junctions showed a mixture of radiographic features and varied high and low signal
changes at the vertebral rim on MR imaging with rims of enhancement in the vertebral body following contrast administration.
Conclusion. Gd-DTPA MR imaging demonstrates a variable signal pattern and degree of contrast enhancement which may reflect the evolutionary
stages of discovertebral enthesitis in ankylosing spondylitis. MR imaging may identify early erosive changes in radiographically
normal vertebra. The role of MR imaging needs further investigation.
Received: 6 April 1998 Revision requested: 7 May 1998 Revision received: 26 October 1999 Accepted: 27 October 1999 相似文献
12.
Pedraza Gutiérrez S Coll Masfarré S Castaño Duque CH Suescún M Rovira Cañellas A 《Neuroradiology》1999,41(12):910-914
We report two cases of hyperacute spinal subdural haematoma secondary to lumbar spinal anaesthesia, identified with MRI.
Prompt diagnosis of this infrequent, potentially serious complication of spinal anaesthesia is essential, as early surgical
evacuation may be needed. Suggestive MRI findings in this early phase include diffuse occupation filling of the spinal canal
with poor delineation of the spinal cord on T1-weighted images, and a poorly-defined high-signal lesion with a low-signal
rim on T2-weighted images.
Received: 10 November 1998 Accepted: 6 April 1999 相似文献
13.
Benign vertebral hemangioma: MR-histological correlation 总被引:3,自引:0,他引:3
Objective: To explain the magnetic resonance (MR) appearance of benign vertebral hemangioma by correlating MR and histological findings
from autopsy specimens.
Design: Sagittal T1- and T2-weighted spin-echo images were obtained in 83 spine specimens. Focal lesions consistent with vertebral
hemangioma at macroscopic examination of sagittal anatomical sections were sampled for histological and quantitative analysis.
At histology, the proportion of surface area occupied by adipocytes, vessels and edema, and hematopoietic cells was determined
(point-counting method) in normal marrow areas and in lesion areas whose signal intensity was either high and intermediate
(pattern A) or intermediate and high (pattern B) on T1- and T2-weighted images, respectively.
Results: Nine lesions were sampled and corresponded to cavernous hemangioma at histology. The proportion of surface area occupied
by adipocytes was statistically significantly higher in pattern A (78.1%) than in pattern B lesion areas (42.7%) and than
in normal marrow areas (47.5%). The proportion of surface area occupied by vessels and interstitial edema was statistically
significantly higher in pattern B (47.0%) than in pattern A lesion areas (15.5%) and than in normal marrow areas (0).
Conclusion: The presence of high signal intensity on T1- or T2-weighted images of vertebral hemangioma is related to the amount of adipocytes
or vessels and interstitial edema, respectively.
Received: 8 September 2000 Revision requested: 29 December 2000 Revision received: 27 March 2001 Accepted: 18 April 2001 相似文献
14.
Epithelioid hemangioma of bone 总被引:1,自引:0,他引:1
Epithelioid hemangioma of bone is a rare type of angiomatous tumor. We report a documented case of epithelioid hemangioma
occurring in the distal femur of a 35-year-old man. The clinical, radiographic, MR imaging and histologic findings of the
tumor are described. Radiographs showed a well-defined expanding, osteolytic lesion in the diaphysis of the femur. MR imaging
showed the lesion to have low signal intensity on T1-weighted images and intermediate signal intensity on T2-weighted images.
Grossly the lesion was multiloculated with a dark brown, jelly-like content. To characterize the imaging appearances of epithelioid
hemangioma, we reviewed the available literature on the subject.
Received: 14 February 2000 Revision requested: 28 March 2000 Revision received: 31 May 2000 Accepted: 1 June 2000 相似文献
15.
The various MRI patterns of pituitary apoplexy 总被引:3,自引:0,他引:3
M. Piotin D. Tampieri D. A. Rüfenacht G. Mohr M. Garant R. Del Carpio F. Robert J. Delavelle D. Melanson 《European radiology》1999,9(5):918-923
The aim of this study was to describe the various MRI features, in correlation to surgical and pathological findings, in
patients who presented with pituitary apoplexy (PA). Eleven patients presenting with PA, were evaluated with various MR protocols
including spin-echo (SE) T1-weighted sequences in 9 of 11 patients, post gadolinium SE T1-weighted sequences in only 8 of
11 patients, and with T2-weighted SE sequences in 2 of 11 patients. All patients had transsphenoidal pituitary surgery after
MR studies. The severity of presenting symptoms ranged from headaches to coma. Ten patients had pituitary macroadenoma; one
had a non-hemorrhagic metastatic lesion into a non-adenomatous pituitary gland. Of the 11 patients, one was studied at the
acute stage of PA (1 day after onset), 9 at the subacute period (3–15 days after onset), and one at the late stage (5 months
after onset). Images compatible with intratumoral hemorrhage were found in all macroadenomas, whereas the metastatic pituitary
lesion did not show evidence of bleeding. All gadolinium-enhanced studies showed partial tumoral enhancement. The SE T2-weighted
studies demonstrated areas of low and high signal intensities in keeping with the presence of blood degradation contents.
Pituitary apoplexy present with different MR features, including hemorrhagic and non-hemorrhagic characteristics on T1-weighted
images. Gadolinium-enhanced images do not provide complementary diagnostic information when the presence of blood is assessed
on plain images.
Received: 20 May 1998; Revision received: 11 September 1998; Accepted: 14 September 1998 相似文献
16.
S. Precetti-Morel M. F. Bellin L. Ghebontni S. Zaïm P. Opolon T. Poynard P. Mathurin P. Cluzel 《European radiology》1999,9(8):1535-1542
The aim of this study was to assess the efficacy of a superparamagnetic iron oxide, ferumoxides, in the detection and characterization
of focal nodular hyperplasia (FNH) on MR conventional spin-echo (SE), fast spin-echo (FSE) and gradient-echo (GRE) images.
Fourteen adults with 27 FNHs were evaluated at 1.5 T before and after injection of ferumoxides. T1-weighted and T2-weighted
SE, T2-weighted FSE and T2*-weighted GRE sequences were used and analysed qualitatively and quantitatively. One hundred percent of FNHs showed a significant
postcontrast decrease in signal intensity on T2- and T2*-weighted images. Heavily T2-weighted SE images showed the maximum
decrease in FNH signal-to-noise ratio (S/N). Postcontrast GRE T2*-weighted images improved the detection of the central scar and the delineation of FNHs and demonstrated the best lesion-to-liver
contrast-to-noise ratio (C/N). Postcontrast T1-weighted SE images showed the least lesion-to-liver C/N. Ferumoxides-enhanced
MR imaging can help detect and characterize FNH. Conventional pre- and postcontrast T2-weighted SE images and postcontrast
GRE T2*-weighted images should be used preferentially.
Received: 30 November 1998; Revised: 5 April 1999; Accepted: 6 April 1999 相似文献
17.
Intramuscular ganglia are rare. Most of the previously reported cases were connected with an adjacent joint. We present the
imaging findings in three patients who had intramuscular ganglia that were not connected with a joint. Magnetic resonance
showed a septated, encapsulated mass that was iso- or hypointense to muscle on T1-weighted and hyperintense on T2-weighted
images. A post-contrast T1-weighted scan in one patient showed minimal capsular enhancement. Ultrasound performed in one case
showed an encapsulated, anechoic mass.
Received 9 June 1997; Revision received 9 January 1998; Accepted 11 March 1998 相似文献
18.
Objective To describe the magnetic resonance (MR) appearances of the bone marrow of children’s feet and to determine their frequency
and significance.
Design and patients. A review of MR studies obtained in a retrospective series of 35 children with foot pain and in a prospective series of 19
asymptomatic children was performed. The MR appearances on T1-weighted, T2-weighted and STIR sequences were assessed and the
frequency of patchy areas of low signal intenstiy on T1-weighted and high signal intenstiy on T2-weighted or STIR sequences
was determined and correlated with clinical features.
Results and conclusions. Low signal intenstiy on T1-weighted and high signal intenstiy on T2-weighted and STIR sequences were seen in 63% of symptomatic
and 57% of asymptomatic children. In all cases where both feet were imaged, the changes were seen bilaterally. The marrow
pattern varied from multiple discrete foci to more extensive confluent areas of high signal on the STIR sequence. These appearances
are frequent and represent normal variation in the growing skeleton, and should not necessarily be interpreted as a sign of
pathology.
Received: 2 October 1998 Revision requested: 20 January 1999 Revision received: 18 February 1999 Accepted: 2 March 1999 相似文献
19.
S. Ehara Daniel I. Rosenthal J. Aoki Kunihiko Fukuda Hideharu Sugimoto Hirokazu Mizutani Kyoji Okada Masahito Hatori Masataka Abe 《Skeletal radiology》1999,28(5):265-270
Objective.To determine whether there is a relationship between the peritumoral edema caused by osteoid osteoma seen on magnetic resonance
(MR) imaging and the patient’s age, duration of symptoms, or location of the lesion. Design and patients. All histologically proven osteoid osteomas seen in our institutions during a 5-year period in patients with known age, gender,
duration of symptoms, and available radiological and MR imaging examinations were included in this study. The extent of the
edema in the bone marrow and extraosseous soft tissue around the nidus of osteoid osteoma on T2-weighted MR imaging were graded
from 1 (nonexistent) to 4 (extensive) by two masked observers. The relationships between the patient’s age, duration of symptoms,
and location of lesions were evaluated by Pearson’s correlation coefficient and analysis of variance. Results.Twenty-seven cases met the inclusion criteria. The observer agreement on grading was good. Patients of 15 years of age or
younger had significantly higher grades than patients older than 15 years. There was a moderate negative linear correlation
between the patient’s age and peritumoral edema. No significant relationship was identified between edema and the duration
of symptoms or the location of lesions. Conclusion. Osteoid osteomas in younger patients tend to be associated with more extensive peritumoral edema.
Received: 13 March 1998 Revision requested: 3 August 1998 Revision received: 12 January 1999 Accepted: 2 March 1999 相似文献
20.
The radiological findings in chronic expanding hematoma 总被引:4,自引:0,他引:4
T. Aoki Hajime Nakata Hideyuki Watanabe Hironobu Maeda Toshihiro Toyonaga Hiroshi Hashimoto Toshitaka Nakamura 《Skeletal radiology》1999,28(7):396-401
Objective. To identify the characteristic MRI findings of chronic expanding hematoma correlated with the pathology.
Design and patients. Three patients who had a chronic expanding hematoma involving the musculoskeletal system were reviewed retrospectively.
Results and conclusion. Huge soft tissue masses suggestive of malignancy with destruction of the bony structure were revealed on radiography and
computed tomography. MRI showed the masses to exhibit heterogeneous signal intensity on both T1- and T2-weighted images with
a peripheral rim of low signal intensity, reflecting the central zones of fluid collection due to fresh and altered blood
with a wall of collagenous fibrous tissue. These MRI findings were seen in all three patients and are considered to be characteristic;
they assist in differentiation from neoplasm in consideration of the history of trauma or surgery.
Received: 11 December 1998 Revision requested: 19 April 1999 Revision received: 21 May 1999 Accepted: 27 May 1999 相似文献