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Biomedical subjects

S Chagnon

Publications and source records attributed to S Chagnon.

89 records · Page 5Linked to original sources
PubMed1981

[Cartilaginous tumors of the spine : a report on three cases with neurological symptoms (author's transl)].

Three cases of cartilaginous tumors of the spine are reported. The first patient had a benign lumbar vertebral enchondroma which had recurred locally on several occasions, causing severe functional sequelae. The second case concerned a patient with a chondrosarcoma of the base of the skull, in whom radiological signs were observed only secondarily on a standard film. The third patient had exostosing disease with an intra-canal osteochondroma provoking neurological disorders. The relative value of computed tomography and opaque myelography is discussed in relation to the last case.

Adolescent↗
PubMed1980

[Cranial osteitis: a report on four cases, including a Gradenigo-Lannois syndrome (author's transl)].

Three cases of hematogenous cranial osteitis are described. The etiology in two cases was a staphylococcus aureus infection from meningeal septicemia. One of these patients died and chronic osteomyelitis developed in the second case. The third case was one of multifocal tuberculous infection, localized in the cranium but asymptomatic. The last case was a Gradenigo-Lannois syndrome, and its etiology, either chronic otitis or sphenoidal sinusitis, is discussed.

Adolescent↗
PubMedDate not supplied

Motion artifacts of the aorta simulating aortic dissection on spiral CT.

PURPOSE: Motion artifacts of the ascending aorta may impair image quality and simulate an intimal flap or a false channel. The purpose of this study is to evaluate the prevalence, amplitude, and extent of motion artifacts of the aorta in spiral CT and to specify the effects of acquisition and reconstruction parameters on these artifacts. METHOD: One hundred seventy-one thoracic spiral CT examinations were retrospectively analyzed by two reviewers. The analysis sought to determine the presence, location, amplitude, and extent of artifacts of the ascending aorta. RESULTS: Aortic artifacts were detected on spiral CT in 57% of cases. The mean amplitude and mean extent were 4+/-4 and 6+/-7 mm, respectively. Artifacts in the ascending aorta were significantly higher with the 360 degrees linear interpolation (LI) algorithm than with the 180 degrees LI algorithm. CONCLUSION: The prevalence of motion artifacts on spiral CT is higher in this study than the reported prevalence in incremental CT. However, this higher prevalence is significantly reduced when the 180 degrees LI algorithm is used.

Aortic Dissection↗
PubMedDate not supplied

[Splenic abscess. A new diagnostic and therapeutic approach. Apropos of 7 cases].

Anomalies in seven patients with splenic abscess were invariably observed on ultrasound imaging despite absent or misleading clinical symptomatology splenomegaly was detected in only 3 cases. The abscess was multiple in 6 cases with perisplenic extension in 2 patients. Splenectomy was performed in only 2 cases. In one patient, diagnostic and therapeutic fine needle puncture of spleen was performed. Comparison with CT scan imaging is presented with respect to 3 patients. Ultrasound imaging can suggest a diagnosis of intrasplenic abscess and fine needle puncture is not contraindicated.

Abscess↗
PubMedDate not supplied

[Intrathoracic and retroperitoneal plasmacytomas in multiple IgA myeloma].

A case of multiple myeloma of bone with retroperitoneal extension is reported and results of ultrasound and computed tomography imaging in this affection discussed. The tumoral mass can be evaluated with precision due to the reliability of CT scan imaging in the diagnosis of bony lesions and a positive diagnosis made and follow up reviews of changes in extra-osseous myelomatous masses conducted by combined ultrasound and CT scan imaging.

Bone Neoplasms↗
PubMedDate not supplied

Comparison of cytologic examination of smears and histologic examination of tissue cores obtained by fine needle aspiration biopsy of the liver.

Biopsies of 30 consecutive suspected liver cancers were performed with 19-gauge fine needles having circumferentially bevelled tips that produced tiny tissue cores suitable for histologic study. The histologic results were compared with the cytologic results on aspirates obtained at the same time with 22-gauge Chiba needles. While cytologic examination of the aspiration smears produced better results than did histologic study of the tiny tissue cores, an improved overall accuracy of 86% was achieved with the combined cytologic and histologic results. The FNA core biopsy technique did not increase the complication rate.

Biopsy, Needle↗
PubMedDate not supplied

[Acute oesophageal obstruction from food or mucilage: a report on 15 cases (author's transl)].

The authors review 15 cases of acute oesophageal obstruction arising from food (meat) or mucilage (3 cases). Obstruction was usually observed in the lower third of the oesophagus whereas in cases with stenosis due to caustic agents (2 cases), or tuberculosis (1 case), the middle third was affected. The obstruction is mainly related to the presence of a dyskinesia with or without an associated hiatus hernia. A transient isolated spasm of the lower oesophageal sphincter was present in three cases (20%). Urgent radiological examinations are essential for diagnostic and therapeutic reasons. An intravenous injection of glucagon must be given systematically and the patency of the oesophagus checked immediately afterwards. One patient was found to have two perforations of the oesophagus at different levels and these were thought to be due to different reasons. That in the cervical region was caused by a swallowed bone, the other was the probable consequence of the fibroscopic examination.

Adolescent↗
PubMedDate not supplied

Phlebography with non-elaborate equipment.

A simplified phlebocavographic technique is proposed, using a standard radiology table and two 30 x 90 cassettes with a screen. These are placed under the floating tray of the table, and are maintained in place with two corner pieces.

Humans↗
PubMedDate not supplied

[Sprains and luxations of the cervical spine in children. Report on 17 cases].

Seventeen cases of sprains and luxations of the cervical spine in children are discussed. Radiological criteria of rotatory sprains and anteroposterior C1-C2 instability are presented in the 6 cases with these lesions, as well as those observed, only after several weeks, in 11 children with inferior cervical spine disorders (3 luxations of which 2 were chronic, and 8 severe sprains). The indications for therapy in each type of lesion are briefly discussed.

Adolescent↗