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D Vadrot

Publications and source records attributed to D Vadrot.

At least 19 recordsLinked to original sources
PubMed1998

MR and CT findings in a case of hibernoma of the thigh extending into the pelvis.

Review of the literature shows no report of hibernoma of the thigh extending into the pelvis. Herein we report a case of hibernoma which appeared on CT and MR as a well-defined pelvic mass with contrast enhancement extending through the obturator foramen into the thigh. Fat was demonstrated by CT, whereas MR, using multiplanar sections, better analyzes the extension of the mass. This case demonstrates that hibernoma as liposarcoma can extend through the obturator foramen. However, no definite diagnosis could be made by CT or MR and the tumor must be considered as a "potential" malignant liposarcoma.

Adipose Tissue↗
PubMed1997

[Value of plasma D-dimer assays in the diagnosis of venous thromboembolism].

The diagnostic usefulness of measuring plasma D-dimers using the ELISA method and the latex agglutination test has been prospectively evaluated in 117 patients hospitalized for suspicion of acute venous thrombo-embolism (AVTE): pulmonary embolism was suspected in 80 patients and the remaining 37 had a suspicion of deep vein thrombosis of the lower limbs. The diagnosis of AVTE was confirmed in 50% of the patients, all of whom underwent gold standard invasive investigation i.e. pulmonary angiography and/or contrast venography. The sensitivity, specificity, negative predictive value and positive predictive value of a D-dimers plasma concentration exceeding 500 ng/ml for the diagnosis of AVTE were respectively 98, 58, 97 and 70% when using the ELISA method, and 86, 71, 84 and 75% when using the latex assay. In 47 patients whose lung scans yielded abnormalities of indeterminate probability of pulmonary embolism, the sensitivity of the ELISA method was very high (94%), but that of latex assay was low (67%). Our results demonstrate that measuring the plasma D-dimers by the latex assay should not be used in the diagnosis of AVTE. On the other hand, the ELISA method might be of great interest in the diagnostic strategy of AVTE, as a normal concentration of D-dimers rules out almost definitely the diagnosis of AVTE, and hence, spares from performing invasive investigations.

Acute Disease↗
PubMed1996

Characterization of adnexal masses: combination of color Doppler and conventional sonography compared with spectral Doppler analysis alone and conventional sonography alone.

OBJECTIVE: To evaluate the importance of color Doppler combined with conventional sonography in characterizing adnexal masses and to compare the results with those of spectral Doppler analysis alone and conventional sonography alone. MATERIALS AND METHODS: One hundred and fifteen women with 132 adnexal masses (98 benign, three borderline, and 31 malignant) were prospectively studied with conventional and Doppler sonography (transabdominal in all patients and transvaginal in 111). Three methods differentiated benign from borderline and malignant masses. In the first, conventional sonography was used. In the second, conventional sonography was combined with color Doppler. In this method, the presence of color flow in an echogenic portion classified as indeterminate or malignant by conventional sonography indicated malignancy; the absence of color flow in an echogenic portion classified as indeterminant or malignant at conventional sonography indicated benignancy; the presence or absence of color flow in a regular wall or septum indicated benignancy. The third method used spectral Doppler analysis. Malignancy was indicated by a resistive index (RI) less than or equal to 0.4, a pulsatility index (PI) less than or equal to 1, or a peak systolic velocity (PSV) greater than or equal to 15 cm/sec. RESULTS: Using conventional sonography alone, accuracy was 83%, sensitivity was 88%, and specificity was 82%. Using conventional sonography and color Doppler, accuracy was 95%, sensitivity was 88%, and specificity was 97%. Using spectral Doppler analysis and an RI less than or equal to 0.4, accuracy was 77%, sensitivity was 18%, and specificity was 98%. For a PI less than or equal to 1, accuracy was 68%, sensitivity was 71%, and specificity was 67%. For a PSV greater than or equal to 15 cm/sec, accuracy was 72%, sensitivity was 47%, and and specificity was 81%. CONCLUSION: Adding color Doppler to conventional sonography produced a specificity and positive predictive value higher than those of conventional sonography alone. Specificity increased from 82% to 97% (p < .001), and positive predictive value increased from 63% to 91%. RI, PI, and PSV were of limited value.

Adnexal Diseases↗
PubMed1995

Mature cystic teratomas of the ovary: CT and MR findings.

OBJECTIVE: To correlate CT and MR patterns of ovarian mature cystic teratomas (MCT). SUBJECTS AND METHODS: CT and MR findings in 25 histologically proven ovarian MCT were retrospectively reviewed. MCT characterization at CT and MR was based on detection of fat and/or a Rokitansky protuberance. MR signal intensity and CT density numbers of fat were correlated. RESULTS: At pathology, 24/25 tumors contained fat, 1/25 a water content, and 23/25 a Rokitansky protuberance. Twenty one MCT contained fat with a density number less than-20 HU (mean density: -95 HU) and a signal intensity superior or equal to sub-cutaneous fat on T1 images, however, only six of these had a signal intensity equal to sub-cutaneous fat on T1 and T2 images and 12 had a reversed chemical shift artifact. Three contained fat with a density number ranging from -13 to +8 HU and a signal intensity inferior to subcutaneous fat on T1 images. CT showed a Rokitansky protuberance in 21/23, containing adipose tissue in 16 and calcified structures in 21. Standard MR showed a Rokitansky protuberance in 14/23 and characterized adipose tissue in eight cases, and calcified material in six cases. Finally, CT characterized 24/25 (96%) MCT. Standard MR characterized 22/25 (88%) MCT, and standard MR with fat-suppression sequences characterized 23/25 (92%) MCT. CONCLUSION: Standard MR is less effective than CT in characterizing fat and has the same difficulty as CT in characterizing fat mixed with hair when its density is high. When fat cannot be identified by either technique, diagnosis of a Rokitansky protuberance is more easily made at CT than at MR.

Adult↗
PubMed1993

Fat suppression techniques in MR imaging of mature ovarian teratomas: comparison with CT.

OBJECTIVE: The aim of this study is to analyze the ability of MR fat suppression techniques to characterize fat components of ovarian mature cystic teratomas (MCT) shown by CT. SUBJECTS AND METHODS: MR images of eight MCTs of the ovary were obtained using standard sequences followed by a SPIR (spectral presaturation with inversion recovery) sequence in six cases and by Dixon sequences in two cases. In all cases correlation with CT and pathologic findings was achieved. RESULTS: MR fat suppression sequences showed to be as accurate as CT in detecting fat inside the cystic part of the teratomas (8/8). CONCLUSION: MR fat suppression sequences should be performed when presence of fat is suspected on images of ovarian tumors produced by standard MR sequences.

Adult↗
PubMed1993

[Value of CT scan and MRI in primary tumors of the ovary].

Characterisation of an ovarian mass is of utmost importance in the preoperative evaluation of an ovarian neoplasm. It enables the surgeon to anticipate carcinoma of the ovary before the operation, so that adequate procedures are planned. Although, ultrasonography (US) remains the foremost imaging modality for screening patients with adnexal lesions, computed tomography (CT) recently has proved to be of value in the characterisation and management of tumors of the ovary. Magnetic resonance (MR) imaging has also been shown to have a high degree of diagnostic specificity for certain types of ovarian masses, such as dermoid cysts, and endometriomas. However, the potential of MR imaging to characterize tumors of the ovary has not yet been established. This study assesses the value of MR imaging and CT for the purpose of predicting the malignancy of ovarian lesions, and comparing findings of MR imaging with those of CT.

Brenner Tumor↗
PubMed1992

Focal hyperdense areas in endometriomas: a characteristic finding on CT.

OBJECTIVE: To assess the value of a hyperdense focus seen on CT scans of endometrial cysts in the differential diagnosis of a lesion. MATERIALS AND METHODS: The preoperative CT scans of 328 patients with 410 ovarian masses (54 patients with 62 pathologically proved endometriomas and 274 patients with 348 pathologically proved other ovarian masses) were retrospectively reviewed in a random fashion without knowledge of the pathologic findings to determine whether a hyperdense focus was visible inside a cyst. RESULTS: In nine of 62 endometrial cysts (sensitivity, 15%), CT scans showed a hyperdense round or crescent-shaped focus, measuring 2 to 15 mm. This focus was located close to the inner border of the cyst in eight cases and in the central part of the cyst in one case. A hyperdense focus was not seen on CT scans of 348 other ovarian masses (specificity, 100%). An in vitro CT study of two specimens showed that this hyperdense area corresponded to a blood clot next to the inner wall of the cyst. This hyperdense area appeared as a nonspecific hyperechogenic focus on sonograms in five of nine cases and as a hypointense signal on T1- and/or T2-weighted MR images in four of five cases. CONCLUSION: The finding on CT scans of a hyperdense focus inside an ovarian cyst is suggestive of endometrioma and should help distinguish endometrioma from other pelvic masses.

Carcinoma↗
PubMed1991

[Contribution of echogradient magnetic resonance imaging in the study of subacromial diseases. Surgical and arthrographic correlations].

Fifteen asymptomatic volunteers and 300 patients with suspected lesions of the rotator cuff were examined with T2*- and proton density-weighted gradient echo (T2*-Rho-GEI) MRI sequences (500-700 ms/30 ms/30 degrees) with a 0.5 T (GE-CGR) system and an adapted surface coil. For the patients, the findings were compared with those of arthrography in 130 cases and of surgery in 42 cases. For the operated patients, T2*-Rho-GEI and arthrography allowed correctly diagnosing 31 complete ruptures (CR). However, surgical exploration of the ruptures showed that T2*-Rho-GEI showed the actual extent of the rupture and the degree of tendon retraction better than arthrography. T2*-Rho-GEI also provides information about the thickness and trophicity of the remaining cuff and on local muscle trophicity. T2*-Rho-GEI allows directly evaluating the tendon of the long head of the biceps both in its extra-articular and its intra-articular parts. In 3 cases of complete cuff rupture, MRI allowed detecting 3 associated lesions of the anterior labrum, which had not been suspected on the clinical examination and had not been demonstrated by conventional arthrography. Lastly, out of 12 cases of deep incomplete rupture (n = 12) correctly diagnosed with MRI, 5 had been undetected on arthrography. Similarly, 8 cases of inflammatory alterations suspected with T2*-Rho-GEI and confirmed by surgery had not been recognized with arthrography. For the non-operated patients, T2*-Rho-GEI and arthrography had corresponding results for the diagnosis of CR (8 cases), of DIR (6 cases) and of intact cuff (6 cases).(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1990

Comparison of magnetic resonance imaging and computed tomography in the preoperative staging of rectal cancer.

Nineteen patients with middle and lower rectal carcinomas were operated on, with abdominoperineal resection in 10 patients, lower anterior resection with coloanal anastomosis in 6 patients, and colorectal anastomosis in 3 patients. The distance of the lower margin of the tumor to insertion of the levator ani on the rectal wall was correctly evaluated by computed tomography in 12 (63%) of 19 patients and by magnetic resonance imaging in 13 (68%) of 19 patients, while digital examination correctly assessed the distance in 15 (79%) of 19 patients. Computed tomography and magnetic resonance imaging were unable to assess extension through the rectal wall. No significant difference was observed between computed tomography and magnetic resonance imaging in assessing extension to the perivesical fat, adjacent organs, pelvic side wall, or lymph nodes. According to the TNM classification, magnetic resonance imaging correctly staged 74% (14/19) of carcinomas, while computed tomography correctly staged 68% (13/19).

Aged↗
PubMed1990

[Comparative study of MRI and x-ray computed tomography in the preoperative evaluation of rectal carcinoma].

Twenty-one patients with middle and low rectal carcinomas have been operated by abdominoperineal resection (APR) in 11 patients, and low anterior resection (LAR) with coloanal anastomosis in 7 and colorectal anastomosis in 3. The distance of the lower margin of the tumor to insertion of the levator ani on the rectal wall was correctly evaluated by CT in 15 of 21 cases (71%) and by MR in 14 of 21 (67%) while digital examination correctly assessed the distance in 17 of 21 (81%). CT and MR were unable to assess extension through the rectal wall. No significant discordance was observed between CT and MR in assessing extension to the perivesical fat, adjacent organs, pelvic side wall or lymphnodes. According to the TNM classification, MR correctly staged 76% (16 of 21) of patients while CT correctly staged 71% (15 of 21).

Adenocarcinoma↗
PubMed1990

[Rapid imaging in orbito-ocular pathology. Contribution of gadolinium].

To evaluate Gradient-Echo Imaging (GEI) in orbito-ocular pathology, 15 volunteers and 34 patients (40 lesions) were examined with GEA T1 and GEA T2 (0.5 T). Results were compared with SE T1 in all cases, with SE T2 in 20 cases and with other imaging modalities (CT). 30 patients were examined before and after injection of gadolinium. Final diagnosis was obtained by surgery or biopsy in 24 cases or by combined results of imaging and clinical findings in 16 cases. Compared with SE, GEA demonstrated a better visualisation of optic nerve, orbital muscles, choroidal-retinal layer, lens capsule and episclera and a better detection of small lesions. It is very helpful for characterisation of lesions containing hemorrhages or paramagnetic components (melanine, gadolinium) or of vascular nature (angioma). Gadolinium was useful for detection of small lesions or characterisation of a few lesions. Thus GEA seems to be an efficient method for the evaluation of orbito-ocular pathology.

Adolescent↗
PubMed1989

[Pulmonary hemorrhage complicating transthoracic puncture].

Fine needle transthoracic aspiration (FNTA) of pulmonary opacities under guidance of computerized tomography (CT) is a simple procedure yielding conclusive results in many patients with malignant lung tumours. The small caliber of the needles utilized and the CT control make this increasingly popular procedure both accurate and safe. Yet a number of complications have occurred; most of them were benign (e.g. pneumothorax) but some were potentially dangerous (e.g. pulmonary haemorrhage), so that the pros and cons of the procedure must carefully be weighed. We report the case of a patient in whom FNTA was complicated by copious haemoptysis and a pulmonary haematoma clearly visible at CT. The literature concerning the potential complications of transthoracic puncture is reviewed.

Aged↗