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C S van Rijswijk

Publications and source records attributed to C S van Rijswijk.

6 recordsLinked to original sources
PubMed2001

Synovial sarcoma: dynamic contrast-enhanced MR imaging features.

OBJECTIVE: To determine whether previously described so-called malignant dynamic contrast-enhanced magnetic resonance (MR) imaging features--early start, peripheral enhancement and early plateau or washout phase--occur consistently in synovial sarcoma. DESIGN AND PATIENTS: Dynamic contrast-enhanced MR images of 10 patients with histologically proven synovial sarcoma were reviewed. The start, pattern and progression of tumor enhancement were assessed and correlated with histopathology. RESULTS: In all patients, the time interval between arterial and early tumor enhancement was less than 7 s (mean 4.40 s, SD 2.09 s). Six synovial sarcomas showed enhancement with a subsequent rapidly progressive linear increase in signal intensity followed by a plateau in one lesion and washout in five. Four lesions showed a late sustained increase in enhancement after the initial rapid increase in enhancement. The pattern of initial enhancement was peripheral in only two lesions, diffuse in four and heterogeneous in four lesions. CONCLUSIONS: Enhancement of tumor within 7 s after arterial enhancement is, of the three parameters described previously, the only sign that occurs consistently in synovial sarcoma.

Adolescent↗
PubMed2000

Bone tumors.

We present an overview of the imaging modalities in bone tumors. The imaging strategies of preoperative work-up, monitoring the effect of chemotherapy and the detection of recurrences by long-term follow-up are discussed.

Adolescent↗
PubMed1999

Cervical carcinoma: can dynamic contrast-enhanced MR imaging help predict tumor aggressiveness?

PURPOSE: To determine whether fast dynamic contrast agent-enhanced magnetic resonance (MR) imaging can demonstrate tumor aggressiveness of cervical carcinoma in patients who are eligible for surgical treatment. MATERIALS AND METHODS: Dynamic contrast-enhanced MR imaging of cervical carcinoma was performed in 82 consecutive patients with stage I or IIA disease who were referred for radical hysterectomy. The maximum slope and amplitude of dynamic first-pass contrast enhancement were quantified. These parameters were correlated with histologic measures of tumor aggressiveness (tumor invasion depth, pelvic lymph node status). RESULTS: The analysis was based on tumors in 62 patients: 30 aggressive and 32 relatively nonaggressive tumors. Twenty patients were excluded from analysis owing to insufficient surgical data, tumor too small for accurate assessment, or technical problems. There were no significant differences between aggressive and nonaggressive tumors in terms of the first-pass contrast-enhancement parameters of slope (2.0 vs 2.1 arbitrary signal intensity units per second, P > .5) or amplitude (24.8 vs 27.8 arbitrary units, P > .2). CONCLUSION: Dynamic contrast-enhanced MR imaging does not facilitate differentiation between aggressive and nonaggressive tumors and therefore has no clinical role in assisting in treatment decisions in patients who are candidates for radical hysterectomy.

Adult↗
PubMed1998

MR imaging of uterine cervical carcinoma: comparison between fast spin-echo MRI and GRASE.

The aim of our study was to compare the image quality of T2-weighted gradient-echo-and-spin-echo (GRASE) MRI and fast spin-echo (FSE) MRI for imaging of cervical carcinoma. In 40 patients FSE8 (TR/TE = 3400/90 ms) MRI with echo train length (ETL) of 8, GRASE (3400/90) MRI with ETL of 18, turbo factor of 6 and 3 gradient reversals, and FSE18 (2500/120) MRI with ETL of 18 were performed. Tissue contrast, subjectively rated image quality, and accuracy of tumor delineation were compared. Surgical correlation was obtained in 27 subjects. Contrast-to-noise ratios of the tumor-cervix stroma, tumor-parametrium and tumor-rectum wall interfaces were better in FSE18 than in FSE8 and GRASE (P < 0.001) but not different between FSE8 and GRASE. Subjective image quality was better in FSE18 and FSE8 than in GRASE (P < 0.02). The accuracy of tumor delineation was similar for the three different sequences. The accuracy of FSE and GRASE MRI for the delineation of cervical carcinoma is similar. Based on measurement of image quality and CNRs, however, high turbo factor FSE provides better image quality in MRI of cervical carcinoma. Whether the superior characteristics may result in better staging has to be explored in larger clinical trials.

Adenocarcinoma↗
PubMed1998

Fast dynamic contrast-enhanced colour-coded MRI in uterine cervix carcinoma: useful for tumour staging?

OBJECTIVE: To quantify first-pass enhancement of cervix carcinoma using fast dynamic MRI. To assess the accuracy of dynamic contrast-enhanced colour-coded MRI for determining tumour invasion into surrounding pelvic tissues. METHODS: Gadolinium enhanced dynamic MRI at one image every 2 s was performed in 47 patients with cervical carcinoma and five controls. First-pass contrast enhancement of cervix carcinoma and surrounding pelvic tissues was quantified. Automated colour-coded images were constructed using the dynamic parameters slope, amplitude and timing of enhancement. Of 47 patients, 28 underwent surgery and colour coded images were correlated with histological findings. RESULTS: First-pass contrast enhancement imaging of cervix carcinoma required a temporal resolution of dynamic MRI of one image every 3-4 s. Cervix carcinoma first-pass was more rapid and intense than that of other pelvic tissues (P<0.001) with the exception of normal myometrium (P>0.05). Binary colour coding, however, was not reliable for tumour delineation or for accurate assessment of tumour invasion into the parametria or the bladder wall. Overestimation of the extent of tumour invasion occurred in 15, 16 and nine out of 28 patients, respectively, using amplitude, slope and timing of enhancement as parameters. CONCLUSION: Dynamic contrast-enhanced colour-coded MRI of cervix carcinoma has limited value for assessing the extent of tumour spread and tumour staging.

Adult↗