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Biomedical subjects

D Jeanbourquin

Publications and source records attributed to D Jeanbourquin.

At least 19 recordsLinked to original sources
PubMed2005

[Pseudotumoral presentation of American pulmonary histioplasmosis].

In France, American pulmonary histoplasmosis is an imported deep mycosis, caused by inhalation of Histoplasma capsulatum. Clinical and radiological features of this exotic disease are multiple, simulating tuberculosis or cancer. We report two cases of American histoplasmosis with pseudo-tumoral form, in immunocompetent subjects working in Venezuela, with a multinodular pulmonary presentation.

Adult↗
PubMed2003

Application of new imaging and calculation techniques to activity and dose assessment in the case of a 106Ru contaminated wound.

The aim of this paper is to describe the dosimetric evaluation of a point contamination that occurred in a laboratory during the examination of an irradiated sample. The incident led to point contamination of the operator's finger due to the presence of mainly 106Ru, with its progeny, 106Rh. The paper reports on the activity and dose assessment, performed using several methods. The measured activity was obtained using a conventional device based on a germanium detector and confirmed using software developed at IRSN, based on reconstruction of voxel phantom associated with the Monte Carlo N-Particle code (MCNP) for in vivo measurement. Two dose assessment calculations were performed using both analytical and Monte Carlo methods, applying the same approach as for activity assessment based on the personal computational phantom of the finger. The results are compared, followed by a discussion on the suitability of the tools described in this study.

Computer Simulation↗
PubMed2000

[Metastasis in pulmonary arteries].

We report two cases of pulmonary tumor emboli. The first patient had a chondroblastic osteosarcoma of the pelvis while the second patient had a seminoma. The possibility of tumor emboli should be entertained in patients with prior history of malignancy presenting with enlargement of the pulmonary arteries and thrombus enhancement on delayed scans.

Adult↗
PubMed1998

[Effort-induced macroscopic hematuria revealing segmental and congenital absence of inferior vena cava].

Absence of inferior vena cava (IVC) is an uncommon congenital abnormality with few clinical repercussions. We report the case of a 39 year old man with chronic pelvic pain, in whom a macroscopic hematuria episode occurring during exercise led to the discovery of an echographic pelvic venous stasis syndrome. Abdominal and pelvic computed tomography scanning then magnetic resonance imaging of inferior vena cava revealed absence of the postrenal segment of IVC with azygos continuation and considerable collateral venous derivations, leading to pelvic cavernoma.

Adult↗
PubMed1998

[Phrenic nerve malignant schwannoma: an exceptional diagnosis].

We report a case of malignant schwannoma of left phrenic nerve in a 65-year-old man. This uncommon diagnosis was suggested by radiological features and confirmed by histological findings on a needle biopsy and surgery specimens. We discuss management, follow-up and prognosis of malignant schwannomas.

Aged↗
PubMed1996

[Asymptomatic pulmonary embolism and venous thrombosis of the lower limbs. Study with spiral x-ray computed tomography].

AIM: Spiral Computed Tomography (CT) allows diagnosis and follow-up in pulmonary embolism (PE). MATERIAL AND METHOD: We studied prospectively with spiral CT 21 patients to evaluate the frequency and the extent of asymptomatic PE in the patients with lower limbs venous thrombosis and no pulmonary symptomatology. RESULTS: We observed a asymptomatic PE in 8/21 cases (34%). Extensive pulmonary thrombosis could be observed despite normal presentation. There was no association between the localization of PE topography and, the extent of the lower limb venous thrombosis extent. CONCLUSION: This study shows about the capability for CT to evaluate PE severity and clinical underestimation PE occurrence.

Female↗
PubMed1995

Should mechanical ventilation be optimized to blood gases, lung mechanics, or thoracic CT scan?

This study was aimed at providing data for optimization of mechanical ventilation in patients with acute respiratory distress syndrome (ARDS). The effects of ventilation with positive end-expiratory pressure (PEEP) titrated to blood gases were studied by thoracic computed tomographic (CT) scans and lung mechanics measurements in eight patients. CT density histograms at end-expiration were used to investigate the effects of PEEP on three differently aerated zones. Static pressure-volume (P-V) curves were used to determine the deflection point above which baro-volotrauma (a combination of barotrauma and volotrauma) may occur. Peak pressures, plateau pressures, and lung volumes measured by Respitrace were compared with the deflection point. CT scan showed that PEEP increased "normally aerated" areas, decreased "nonaerated" areas, and did not change "poorly aerated" zones. No correlations were found between CT scan and either PaO2 or mechanical data. Pressure at the deflection point was lower than the usually recommended 35 to 40 cm H2O for peak pressure in four patients (range, 28 to 32 cm H2O). With regard to plateau pressures, only one patient was ventilated above the deflection point. However, monitoring of volumes showed that these four patients had an end-inspiratory volume above this point. We conclude that mechanical ventilation may be initially adjusted on the basis of blood gas values and then optimized on the basis of lung mechanics to limit the risk of baro-volotrauma.

Adolescent↗
PubMed1993

[Cholesteatoma of the posterior cerebral fossa. 7 cases and review of the literature].

Fifty percent of intracranial epidermoid cysts are located in the cerebral posterior fossa. Clinical presenting features are not specific and vary according to cyst topography and mass effect on neighbouring structures. In CT, the lesion is hypodense as related to the cerebral tissue, but with no specificity. In MRI, the typical form shows quasi-pathognomonic morphologic characters with polyedric contours, a marble aspect, a reduced mass effect as compared to the tumor volume and an evolution signal close to that of cerebrospinal fluid, with no increase after contrast agent injection. Some primary cholesteatomas have a different radiological aspect. They can be hyperdense in CT and have a spontaneous hyperintense signal in T1-weighted MRI sequence. They correspond to complicated epidermoid cysts associated with hemorrhages and granulomatous meningeal reaction whose constitution is very very close to that of cholesterine granulomas.

Adult↗
PubMed1993

[Inflammatory pseudo-tumor of the lung. Clinico-pathologic report of a case].

One case of a solitary pulmonary nodule occurring in a 54-year-old woman with history of breast carcinoma is presented. Histological examination of the surgical specimen excluded breast carcinoma metastasis and revealed an inflammatory pseudotumor. Principal clinico-pathological findings in previously reported cases are described. Inflammatory pseudotumors may exhibit, as in our case, some nuclear atypia making the diagnosis sometimes difficult with malignancy.

Breast Neoplasms↗
PubMed1992

Anatomic and radiologic bases of surgery of the thoracic aorta.

Lesions of the thoracic aorta create problems related to their site and relations with the main aortic branches. The aim of surgery must be to treat the lesion while ensuring perfusion of the tissues excluded by clamping during the operation. Anatomic study of the aortic lesions is based on imaging. Angiography is still often the basic examination though it shows only the lumen and course of the aorta. However, CT and MRI visualise the aortic wall and especially the relations of the aorta to the mediastinal structures. A comparison of anatomic and imaging studies was made on 10 fresh subjects coming from the anatomy department of the Saints-Pères and from the school of surgery of Fer à Moulin. Sections were made every 3 to 5 mm in 3 planes (sagittal, coronal and axial) after CT localisation of the plane of section. This anatomic study was correlated with CT and MR images made on healthy volunteers. The choice of surgical management of a lesion of the thoracic aorta is based on preoperative anatomic assessment by imaging applied not only to the aorta but also to its branches and the territory supplied.

Aorta, Thoracic↗
PubMed1992

[Radiological aspects of acoustic neurinoma].

For a long time CT constituted the technique of choice for the investigation and pretreatment staging of acoustic neuroma. It is sometimes inadequate especially for defining the extra-axial site of a tumour or for identifying small lesions. Today, any case of suspected acoustic neuroma should undergo first-line MR studies. MR identifies almost all extra-axial lesions, clearly visualises small lesions and provides a satisfactory pretreatment staging in the majority of cases, acoustic neuroma presents a signal intensity identical to or lower than that of the brainstem with a high intensity signal on T2-weighted SE sequences and post-gadolinium T1-weighted SE sequences, generally with a mixed intra- and extra-meatal location and eccentric in relation to the anterior border of the porus.

Humans↗
PubMed1991

The thoracic esophagus: sectional anatomy and radiosurgical applications.

The relationships of a tumor of the thoracic esophagus to the adjacent mediastinal structures are currently studied by means of computed tomography (CT), magnetic resonance imaging (MRI) and, more recently, by echoendoscopy. However, the assessment of axial mediastinal CT and of MRI in the coronal and sagittal planes calls for some degree of experience. To further this training a sectional anatomy is proposed in correlation with imaging of the thoracic esophagus and the posterior mediastinum. Ten fresh subjects whose vascular networks had been previously injected with colored resin were sectioned along the three planes of space after positioning under CT monitoring. The axial sections were compared with the CT images made with a GE 9800 Quick scanner. Three frontal and sagittal sections were compared with the MRI images made with a GE Signa apparatus using a high magnetic field. The relations of the esophagus were studied at three levels: the supra-azygo-aortic segment, where it is related to the left subclavian artery; the inter-azygo-aortic segment, where access to the esophagus is barred on the left by the aortic arch and on the right by the arch of the azygos vein, section of which provides ample access; and the sub-azygo-aortic segment, where the esophagus passes behind the left main bronchus and to the right of the descending aorta, two organs whose invasion contraindicates excision of a tumor of the esophagus but is difficult to assess by current thoracic imaging techniques. The esophagus then descends behind the left atrium; the investigation of the kinetics of the heart cavities by transesophageal echocardiography is an application of this anatomic relationship.(ABSTRACT TRUNCATED AT 250 WORDS)

Esophagus↗