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Biomedical subjects

D Couanet

Publications and source records attributed to D Couanet.

At least 73 records · Page 4Linked to original sources
PubMed1984

Contribution of computed tomography (CT) in the study of 24 head and neck embryonic rhabdomyosarcomas in children.

Our study of 24 head and neck embryonic rhabdomyosarcomas in children confirms the substantial contribution of CT: -to the diagnosis, by showing the soft tissue mass, the bone destruction especially at the skull base, orbital walls and walls of the maxillary sinuses and intra-orbital or intra-cranial extension, -for the follow-up during treatment, it shows the efficacy of treatment, confirms the diagnosis of complete remission and contributes to an evaluation for recurrence.

Child↗
PubMed1984

[Value of x-ray computed tomography in the diagnosis and surveillance of abdominopelvic recurrence of cancers of the uterine cervix. Apropos of 38 cases].

A retrospective study was conducted involving all case reports of patients treated for uterine cervix cancer, and investigated by a CT scan for suspected or follow up of a recurrence between Jan. 1981 and Nov. 1982. CT scan findings are described and the value of the method assessed; it appears to be very effective for diagnosis of recurrence in lumbar aortic lymph nodes, since it was the only examination enabling positive diagnosis in 13 out of 15 cases. Its diagnosis value is less in pelvic tumor recurrence, directly accessible to clinical examination (3 diagnoses only out of 9 cases). The CT scan is a reliable exploratory procedure since only 4 examinations were normal of the 38 completed. Possible therapeutic applications are discussed.

Adult↗
PubMed1984

[Hypercalcemia associated with tumors in children. 20 cases].

Thirty episodes of hypercalcemia were observed in 20 children with solid tumors: principally 9 cases of non Hodgkin's lymphomas, 4 cases of rhabdomyosarcomas and 4 cases of Wilms' tumors. The 2 children with neurological manifestations and hypertension had the most severe symptoms secondary to the high calcium levels. However, hypercalcemia was asymptomatic in 8 of the 20 children. Focal seizures and metastatic calcifications subsequently occurred in 6 children. Emergency treatment of hypercalcemia often had partial or transient efficiency. In contrast, high calcium levels always returned to normal after anti-tumoral treatment.

Adolescent↗
PubMed1983

[Computed x-ray tomography in the study of 16 undifferentiated epitheliomas of the cavum nasopharyngeal type in children].

CT scans were performed in 16 children with undifferentiated epitheliomas of the cavum nasopharyngis type. The CT scan provided the most precise data during initial investigations, especially clear information being obtained on any intra-orbital or intracranial extension, which may occur without clinical signs. The scan is also a valid method for determining efficacy during treatment, and for the early detection of recurrences.

Adolescent↗
PubMed1983

Radiological findings in 23 pediatric cases of malignant histiocytosis (MH).

Malignant histiocytosis (MH) is a disease which clinically and histologically resembles non-Hodgkin lymphoma. Tumoural cells appear to be derived from histiomonocytes. Clinical signs commonly include: high fever, sudden onset of extreme fatigue, diffuse painful polyadenopathies and infiltrated cutaneous nodules. This study involved the radiological findings of 23 pediatric cases of MH. Thoracic involvement is very frequent (69%) and most often involves mediastinal lymph nodes. Interstitial (34%) and pleural (38%) lesions are often associated. Nine of 21 (42%) lymphographies showed pathologic changes, the most frequent pattern in retroperitoneal nodes was multilacunar and nodes were moderately enlarged. Some isolated lymph nodes were normal. Bone lesions were rare and were either lytic or sclerotic.

Adolescent↗
PubMed1982

Computed tomography in the evaluation of 41 cases of Ewing's sarcoma.

Computed tomography (CT) has already proved extremely effective both in cerebral and abdominal pathology. Several recent publications describing first heterogeneous series [1, 2, 7, 11-17], then studies of a single type of lesion [3-6, 8] have illustrated its usefulness in the study of bone lesions. This report deals with 41 cases of Ewing's sarcoma studied by CT at the Institut Gustave Roussy from October 1977 to July 1981, and tries to show both the limitations and indications of this technique for the diagnosis, treatment, and follow-up of Ewing's sarcoma as well as in the diagnosis of any eventual recurrence.

Adolescent↗
PubMed1981

[The use of the CT-scan in the staging of neuroblastoma in childhood (author's transl)].

Thirty seven children with neuroblastoma were investigated by CT-scan. Twenty three of them underwent surgery allowing anatomical correlation. CT-scan was of little diagnostic help but proved very helpful in assessing the extent of the tumor: CT-scan and surgery were in agreement in 73% of the operated cases. CT is therefore an accurate means of predicting the operability of neuroblastoma.

Abdominal Neoplasms↗
PubMed1980

Pseudotumoural fibrous dysplasia of the maxilla: radiological studies and computed tomography contribution.

Clinical, radiological, and histological problems arise relating to fibrous dysplasia of the maxilla. Clinically, 11 of our 39 cases developed so rapidly that the lesions were suspected of being malignant. The histological diagnosis may be very difficult, since any tumoural, reactive, or healing process may simulate fibrous dysplasia. As a general rule, the diagnosis is established most easily by the radiological examination. The radiologist's responsibility is important, as mistakes may have serious consequences. We report four pseudotumoural forms of maxillary sinus fibrous dysplasia. All were characterised clinically by rapid evolution, radiologically by opacity of the sinus with apparent destruction of its wall, and histologically by difficulty in establishing the diagnosis. In two cases indeed, the initial histological interpretation was an osteogenic sarcoma. Due to its excellent densitometric resolution, computed tomography provides an invaluable contribution by displaying the fibrous wall of an intact or even thickened maxillary sinus when conventional radiology has suggested a destructive process. In difficult cases of maxillary fibrous dysplasia, computed tomography should be used as a supplementary investigation to establish the correct diagnosis.

Adult↗
PubMed1980

[Computed tomography investigation of hepatic carcinomas (author's transl)].

Computed tomography examinations, using a second generation Acta 200 FS apparatus, were conducted on 28 occasions in 25 patients with hepatic carcinoma. Before injection, the tumor is usually of low density, to a small degree in many cases, and is heterogeneous and has indefinite limits. The sensitivity of the method is 96 p. cent. A precise study of the localization of the tumor was possible in only 11 cases, and a definite diagnosis was made in 64 p. cent. The method was only moderately effective in assessing the degree of regional extension. When compared with other methods for the investigation of the liver (scintigraphy, ultrasonography, arteriography), computed tomography shows no superiority over ultrasonography which should be employed for the initial examination.

Adult↗
PubMed1980

[Radiographic signs of radiolesions of the pelvis (excluding the femur) after irradiation for epithelioma of the cervix uteri (author's transl)].

Radiolesions of the pelvic bones (excluding the femur) were observed in 29 patients after irradiation therapy for cervix uteri cancer. Three regions can be affected corresponding to the areas irradiated: the sacrum and internal part of the iliac wings, the pubis, and the cotyles. In most cases the lesions appeared after 1 to 4 years. Their radiological appearances are characteristic, the principal sign being irregular bone condensation in a demineralized bone, without true cavitation. The only lytic lesions observed were in the pubis. Calcification of soft tissues may occur and fractures are frequent. There is a slow progression of the lesions over long periods. Clinical, radiological, and progression signs differentiate radiolesions from other affections: metastases, invasion by contiguity, infections, and radio-induced sarcoma.

Bone Diseases↗
PubMedDate not supplied

Importance of a post-therapeutic residue in the prognosis of head and neck rhabdomyosarcoma in children.

Enhanced contrast computed tomography (CT) was performed in 23 children treated for head and neck rhabdomyosarcoma (RMS). The CT studies were retrospectively reviewed by two senior radiologists. Analysis of these CT studies revealed to separate groups of patients. One group (12 patients) had a post-therapeutic residue defined as soft tissue thickening at the original site, which remained stable over a period of 3 months and caused no mass effect on adjacent structures. Of these 12, eight showed enhancement at the area of thickening. Nine of these 12 patients relapsed. The other group (11 patients) demonstrated no post-therapeutic residue; only three of these patients relapsed. In this study the presence of a post-therapeutic residue was significantly associated with a poor prognosis, using a Fischer's test (P = 0.04).

Adolescent↗