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Biomedical subjects

K Marsot-Dupuch

Publications and source records attributed to K Marsot-Dupuch.

At least 91 records · Page 5Linked to original sources
PubMed1991

[Malignant external otitis. When and which imaging].

Malignant external otitis (MEO) is a severe infection of the external auditory canal (EAC), most often caused by Pseudomonas aeruginosa, although a few cases are caused by an Aspergillus (4). Mortality remains high (20%) in spite of an early general antibiotic treatment. This infection of the soft tissue of the EAC causes cellulitis, chondritis and osteomyelitis, and there are risks of diffusion into the base of the skull. Our work is aimed at placing computed tomography and magnetic resonance imaging into the context of exploration of this infection, in relation to radionuclide scanning, owing to our experience with 10 patients. Imaging appreciates the anatomical extension of the infection beyond the EAC and towards the base of the skull and the infratemporal fossa, this being a key element for prognosis. It assesses the efficiency and duration of treatment, although the criteria of healing are still difficult to appreciate and late recurrence is frequent. Exceptionally, it is useful for diagnosis in some particular clinical forms.

Adult↗
PubMed1991

[Parotid metastases: value of imaging. Review of the literature, apropos of 4 cases].

Parotid gland is a very unusual site of metastasis. Four proven cases are described. The tumor was occult in three cases out of four. In one case, an extra neck primitive tumor was suspected. Two kinds of metastases are described: firstly, metastases within the salivary gland with look like pleomorphic adenoma and are secondary to hematogenous spread; secondly, lymph node metastasis (two cases). Their diagnosis appear easier as they are not usually completely surrounded by parenchyma. They can reveal either occult head and neck tumor or visceral tumor.

Adult↗
PubMed1991

[Echography of the parotid gland].

Ultrasound is the first choice imaging modality for the evaluation of parotid lesions because of its simplicity and its sensitivity which is as high as that of a CT scan. It can differentiate between benign and malignant tumors. However MRI is necessary for the exploration of the deep lobe, regional spread and a better histopathologic differentiation.

Humans↗
PubMed1991

[Uncommon presentation of thyroid cancer].

Thyroid carcinomas are rare. Papillary carcinomas are the most frequent and preferentially spread via lymphatics. Cervical lymph node metastases are common and may be the presenting sign of the disease, when thyroid carcinoma is occult.

Adult↗
PubMed1991

[Organized follicular cyst simulating a sinus lesion].

Follicular cyst is a frequent lesion rich in cholesterine and methemoglobin. These cysts produce T1 shortening and a high intensity signal on T1-weighted imaging. The most frequent location is the lower mandibular ramus. Sometimes, it occurs in the maxillar with possible involvement of the paranasal sinuses simulating a mucocele or a space-occupying lesion of the sinus.

Diagnosis, Differential↗
PubMed1991

[Lipoma of the parotid gland. Apropos of a case].

Lipoma of the parotid gland is a rather rare tumor (2-3% of all tumors of the gland). Comparative imaging of a case of parotid lipoma by computed tomography, sonography and magnetic resonance is presented.

Adult↗
PubMed1991

[Facial sinuses. Inflammation].

The radiologist must have a thorough knowledge of the normal anatomy and the pathologic spectrum of the paranasal sinuses to in order determine the location and the extent of abnormality and to plan the surgical approach. We describe the normal anatomy and variations such as concha bullosa which can alter nose physiology. Many examples of congenital and inflammatory lesions affecting this region are described, such as naso-sinus polyposis and congenital or inflammatory lesions.

Humans↗
PubMed1991

[Benign pathology of the facial bones].

Benign pathology of the facial bones is divided into three groups: congenital, infectious and neoplastic. The knowledge of segmentation of the face into meridians is important for understanding malformations. Panoramic X-rays remain their diagnostic value. CT is able to define the exact location and contents of the tumor. Nowadays, MRI, sometimes gives information concerning the exact contents of tumors. The face is divided into meridians numbered from 0 to 7 and from 8 to 14 counting from the middle part to the external auditory neatus. Infection from dental caries may spread to the maxilla and the mandible and sometimes into masticator spaces. It can be responsible for maxillary fungal sinusitis in tumor. The main problem is not exact diagnosis but the exact location and extent of the disease in order to allow large surgical removal.

Facial Bones↗
PubMed1991

[Tumors of the facial bones. Current imaging: x-ray computed tomography versus MRI].

This study evaluates the comparative efficacy of MRI and CT in evaluating facial tumors. MRI, with its excellent contrast on T2 weighted and post-gadolinium sequences, is superior to CT for delineating tumor extension, the information essential for appropriate surgical intervention. Both modalities can sometimes be helpful for tumor characterisation.

Bone Neoplasms↗
PubMed1991

[Malignant granuloma of the mid-face: value of x-ray computed tomography/MRI imaging].

CT an MR imaging are now an integral part of the work-up of every ulcerative lesion of the mid-face. The CT scan enables an exhaustive evaluation of the bone and cartilage necrosis by using bone densitometry settings. The mass lesions, the inflammatory areas and the thickened mucosa are best demonstrated using the tissue densitometry settings. Injection of iodinated contrast material makes clearer delineations of the abnormalities, but doesn't differentiate well between muco-purulent fluid retentions (in the sinuses for example) and solid neoplastic masses. MRI is the technic of choice for this goal; it also gives helpful images in the sagittal and frontal planes. CT and MR imagings are best combined to guide the surgical biopsies and the radiation therapy when managing the difficult problem of mid-face ulcerative lesions.

Facial Bones↗
PubMed1991

[Endonasal microsurgery].

Endoscopic surgery of the sinuses is a valuable procedure for evaluating allergic or infectious chronic recurrent sinusitis. It allows assessment of the ostium and the state of the mucosa. Its complications are exceptional (rhinorrhoea, meningitis, orbital trauma), but require a detailed preoperative examination in order to reveal variations in sinus anatomy. The role of preoperative CT is therefore to analyse the type and the extent of the disease and individual anatomical variants. It is difficult to predict the depth and angle of introduction of the endoscope on the basis of the CT scan, which is performed in the coronal plane with variable angle. Ideally, only lateral scans would allow guidance of the introduction of the endoscope (hence the value of MRI or 3-D reconstructions).

Endoscopy↗
PubMed1991

[Study of the salivary glands in 1990].

Radiologic examination of the salivary glands can provide clinically useful information that may help to establish the diagnosis and indicate appropriate therapy. US and conventional sialography remain the standard methods of examination for inflammatory diseases and superficial parotid masses. However, CT and MR have allowed a new means of examination of parotid lesions, or of lesions around the parotid gland. MR appears to be the procedure of choice to investigate adenoid cystic carcinoma, recurrence and tumors expanding into the pterygopharyngal space or the sub-tonsillar space. Stenon duct endoscopy is a new imaging and therapeutic procedure to be introduced into the therapeutic strategy in these patients.

Humans↗
PubMed1990

Mandibular nerve: MR versus CT about 10 proved unusual tumors.

10 patients with symptoms of mandibular neuralgia formed the basis of this study. They were studied by both enhanced CT and MRI. MRI, better than CT, easily permits distinction between intrinsic and extrinsic lesions and detects involvement of the cavernous sinus and meninges. Moreover, because of its multiplanar imaging capability, and ability to portray exquisite anatomic details and characteristic tissue signal intensity, MRI is helpful in the evaluation of tumor involvement for biopsy and preoperative planning for these deep tumours.

Adult↗
PubMed1989

[The value of MRI in a case of cerebro-meningeal miliary carcinomatosis of melanotic origin].

Despite the frequency of cerebral metastases from melanoma, there have been very few papers on this subject in the radiological literature. We report one such case, original by its disseminated carcinomatosis appearance and by the disassociation between computed tomography and magnetic resonance imaging, illustrating the greater sensitivity of the latter examination. In view of the fact that 11 to 13% of patients with a cerebral metastasis from melanoma are asymptomatic, there may be a place for screening of these patients by MR imaging. The association of neurological lesions and cutaneous naevi raises the problem of neurocutaneous melanosis (degenerating phakomatosis).

Adult↗