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C Davy-Miallou

Publications and source records attributed to C Davy-Miallou.

8 recordsLinked to original sources
PubMed2000

[Audit on pelvimetry at a polyvalent radiology department].

PURPOSE: Study of the dose absorbed by the fetus during CT pelvimetry. MATERIAL AND METHODS: Twenty consecutive pelvimetries on pregnant women showed the mean fetal location in regard of the maternal pelvic skeleton (retrospective study). Then, thermoluminescent radiation detectors were put in the antropomorph phantom slices, in housing correspondent to the fetal's volume. The location of this volume has been determined by the first study. Two different CT units were tested. RESULTS: In case of cephalic presentation, the maximum fetal dose was 3 mGy. In case of pelvic presentation, because of an additional frontal topogram, the dose reached 3,3 to 3,6 mGy. CONCLUSION: We recommend: 1) reduction of parameters (120kV and 100mAs) for "normal" women; using other parameters for larger women; interval follow-up to evaluate results using these parameters; 2) tilting the bisciatic plane of section so to avoid direct exposure to the fetus; 3) limitation to 25 cm for the lateral scout; suppression of the routine frontal scout in case of pelvic presentation.

Female↗
PubMed1998

Perirenal textiloma: MR and serial CT appearance.

We describe changes in imaging features of a textiloma (retained surgical sponge or retained foreign body) left in the renal fossa after exploratory renal surgery. One year after the initial surgery, the MR aspect of the textiloma was not specific, with a homogeneous low signal intensity on T1-weighted images. Serial CT examinations over 4 years demonstrated progressive growth and calcification of the mass which appeared pseudocystic with a peripheral inflammatory wall. Granulomas caused by a retained surgical sponge should be considered as a cause of retroperitoneal mass in patients with a history of prior surgery.

Adult↗
PubMed1990

[False image of portal thrombosis in MRI: pitfalls in portal hypertension. Apropos of Budd-Chiari syndrome].

This observation illustrates how difficult it is to interpret the intravascular signal observed with MRI in cases of portal hypertension. A signal occupying the entire lumen of the portal trunk and branches can be seen, which is constantly observed in the axial as well as coronal planes in the 3 series studied. It is hypointense relative to the liver on T1-weighted images, hyperintense on T2-weighted images: this appearance therefore perfectly mimicks portal thrombosis. Ultrasound combined with pulsed Doppler demonstrates the stagnant blood within the patent portal system. This kind of artifact, which is produced by a very slow flow or even by the standstill of flow, is much more difficult to recognize than the common flow artifacts; the criteria put forward by various authors to distinguish between artifacts and thrombosis are of no avail in this case. Examinations must able to confirm or rule out portal thrombosis in the case of portal hypertension with deceleration of flow. In practice, ultrasound studies, combined with pulsed Doppler in the best cases, is therefore indicated as a first-intension technique.

Budd-Chiari Syndrome↗
PubMed1990

[MRI of the normal portal system: the artefacts. Apropos of 45 cases].

The protal system of 45 normal patients have been retrospectively studied on spin echo MRI sequences (interleaved cuts): multiple artifacts have been evaluated and 24% of them were visualized at the portal system level. Thus, partial volume effect responsible for almost 25% of the artifacts is not always easily seen on a single sequence. Respiratory and aortic artifacts can deteriorate the visualization of the vascular lumen but cannot be confused with a thrombosis. Well-known artifacts, as slice entry phenomenon and even echo rephasing, represent more than 60% of the artifacts: they are readily recognized when they are typical and indicate flowing blood. On the contrary, an other artifact, representing less than 5% of the total and seen at the level of the left portal vein, simulates a thrombus, on T2 weighed images. We conclude that the frequency and polymorphism of the artifacts are limiting factors of MRI value in the diagnosis of portal vein thrombosis.

Adult↗
PubMed1987

[X-ray computed tomographic aspect of gastric leiomyoma. Apropos of a case].

This report studies the diagnostic problem raised by benign pedunculated gastric leiomyoma identified by CT scan imaging and associated with hepatic metastases. Evaluation of the angle of attachment to the wall, the conventional feature enabling distinction between malignant and benign submucous tumours is not always a reliable indicator.

Adult↗
PubMedDate not supplied

[Pelvic lymph node groups in computed tomography. Topographic atlas].

This atlas was prepared to facilitate the diagnosis of lymph mode enlargement in the pelvic region and to improve topographic diagnosis. Fifty computed tomographies were performed after lymphography using centimetric pelvic slices in order to select eight levels for reference. A statistical analysis was conducted to establish a diagram of the mean number of lymph nodes on the right and left side for each level. A table was established indicating the mean number and standard deviation for each group of nodes for the 8 different levels. In addition, a control slice (chosen among 50) accounts for the morphology of the iliac vessels, of the lymph nodes and psoas muscle most frequently encountered at each level. The distribution of the groups of nodes shows why interpretation can be difficult, particularly at vessel bifucations and confluents. Precise morphology based on effective opacification, especially in the pelvic area, is required for positive and especially topographic diagnosis. Finally, the description of the medial border of the psoas muscle and its close relations with certain groups of lymph nodes can cause some problems because of the similar densities. The atlas is of great help here.

Anatomy, Regional↗