Search PubMed⌕ Search

Biomedical subjects

J L Kahn

Publications and source records attributed to J L Kahn.

At least 37 records · Page 2Linked to original sources
PubMed1996

[The peripharyngeal space. Anatomy and normal imaging].

Sectional anatomy and dissection allow topographic study of the peripharyngeal region. Anatomic study has been performed by projection on the skull base of the limiting fascia and by 6 mm thick anatomic slices in the three fundamental planes. Three spaces are identified: retropharyngeal space represents a slipping structure upon the cervical spine. The prestylian space is mostly formed by an adipose column along the pharynx and by the medial part of the parotid gland. The retrosylian space includes the internal jugular and carotid vessels, the four last cranial nerves and the cervical part of the laterovertebral sympathetic trunk. CT an MR imaging were performed on ten patients with cervical or cephalic diseases distant from peripharyngeal regions. CT imaging is only useful in axial and frontal views for the prestylian space. MR imaging is the best method to visualize the three components of the peripharyngeal region. Confronting sectional imaging with anatomic slices allows better recognizing of limits and contents of the different parts of peripharyngeal regions.

Humans↗
PubMed1995

[A cephalometric study of the pterygoid process during growth].

This study consists in a three dimensional cephalometric approach of the pterygoid process and its relationships with the neighbouring cranio-facial structures, using biostatistical analysis. The authors present the results of this method comparing the variations of the pterygoid process in relation to the variations of the basi-cranium and the face.

Adult↗
PubMed1993

[Maxillary metastasis of malignant thymoma].

The authors report a case of maxillary metastasis in the follow up of a malignant thymoma. It seems to be the first case reported in today's scientific literature. The clinical presentation, histopathological features and prognosis of malignant thymoma are discussed. The worse influence of distant metastasis on survival rate is state precisely.

Aged↗
PubMed1992

[Osteosynthesis using resorbable plates in maxillofacial surgery: hopes and disappointments].

The use of absorbable osteosynthesis material has two advantages in maxillofacial surgery: suppressing the possible biological effects of implanted metallic foreign bodies, making second surgery for material removal useless. Although the biotolerance of currently used materials is well known, the authors intended to test their use in the specific conditions of maxillofacial surgery, in which simply extrapolating the data collected in general surgery leads to erroneous conclusion. The authors report the results of a preliminary clinical study on 21 cases of osteosynthesis of the upper third of the face using absorbable plates (18 fractures of the zygomatic bone, 3 maxillary osteotomies). The biotolerance of the material is very good, after more than 3 years for the oldest cases. The mechanical stability of the assembly is sufficient for the selected indications. As regards disappointments, these include the thickness of the plates, the difficulty to adapt them to bony surfaces, the fragility of the screws and the slow resorption of the material.

Biocompatible Materials↗
PubMed1992

[The value of computer reconstruction of the frontal and sagittal planes of the facial structures].

The authors evaluate the merits of computer reconstructions in the coronal and sagittal planes to assess the anatomy of the facial structures. If the patient can be kept motionless, the coronal plane provides information similar to those obtained by a study with direct sections. The ethmoidofrontal recesses, the lamina cribrosa, the thin relief of the middle meatus, the floor of the orbit are perfectly examined. The sagittal plane provides a new approach of the anterior and posterior cortical bone, of the frontal sinus, of the nasofrontal canal, of the ethmoidal cells, of the sphenoid sinus and of the vault of the palate.

Ethmoid Sinus↗
PubMed1992

[The posterior intervertebral spaces of the craniovertebral joint].

Closing of the posterior intervertebral spaces of the craniovertebral joint is not performed by the classical posterior atlanto-occipital and atlantoaxial membranes. In the atlanto-occipital space, the connective laminae come from the occipital periosteum and from the anterior fascia of the rectus capitis posterior minor muscle, and pass round the anterior side of the posterior arch of the atlas to reach the spinal dura mater. In the atlantoaxial space, the anterior fasciae of the rectus capitis posterior major muscle and of the inferior oblique muscle, as well as the periosteum of the posterior arch of the atlas, extend to reach the spinal dura mater. Thus, the epidural space is sealed posteriorly by the connective laminae of the atlantoaxial space, and lets above a superior recessus containing the ganglia of the spinal nerves C1 and C2 and in which the vertebral artery transits.

Adult↗
PubMed1991

[Carcinoma cuniculatum. Apropos of 4 cases with orofacial involvement].

Carcinoma cuniculatum, a rare variant of verrucous carcinoma, was first described in the foot. The authors report 4 cases of uncommon localizations of this tumor, involving oral cavity and face, 3 of them having a 6-year follow-up. The specific histological and clinical features of this tumor are remembered and the difficulties of its diagnosis are emphasized. This slow-growing, ulcerated proliferation, invading the surrounding tissues, is often responsible for chronic suppuration, but very rarely metastasizes to the regional lymph nodes. The surgical treatment consists in a wide excision; neck dissection is theoretically useless, and radiotherapy is strictly contraindicated because of the risk of transformation into an anaplasic carcinoma. For all these reasons, carcinoma cuniculatum must be considered as an anatomoclinic entity, and deserves to be known by the clinicians and the pathologists.

Carcinoma, Papillary↗
PubMed1990

[Vascularization of the adipose body of the cheek].

The vascular pedicles of Bichat's fat pad are numerous. The most important artery is the buccal artery, branch of the maxillary artery, which supplies the principal part and the six extensions of the buccal fat pad. Not only many other branches of the maxillary artery, but also branches of the facial artery and of the superficial temporal artery send thin vessels to cross the capsule and supply Bichat's fat pad, body and extensions, from periphery to center. The microcirculation of Bichat's fat pad shows a network almost similar with those of the other zones of white adipose tissue, but the capillary meshes are smaller and more tightened, the capillaries have a bigger diameter and several "basket-like" structures are to be find beneath the capsule.

Adipose Tissue↗
PubMed1989

Is the myosin type altered in the aging platysma?

The myosin light chains of platysma samples originating from 2 to 86 year old patients of the maxillo-facial surgery clinic were investigated. The platysma contained both fast and slow myosin. No change in the proportion of myosin type in relation to age was found. Female patients often displayed less fast myosin than male patients. Each time when the platysma muscle activity has been reduced a decrease in the amount of slow myosin light chains was observed. In the reported study, variations of the fast and slow myosin light chains resulted mainly from the platysma activity level, i.e. from the pathology requiring the surgery, rather than from the patients' age.

Adolescent↗
PubMed1989

[Surgical treatment of hypoplasia of the ascending ramus of the mandible in children using an autologous osteochondral costal graft].

To lengthen the child's mandibular ramus, we use, since 1977, an autologous osteochondral rib graft fixed to the posterior margin of the ramus. Experimental studies show that this graft has a growth potential, the osteochondral junction responds to the biomechanical forces in a similar way to the mandibular condyle. Surgical treatment allows an immediate restitution of the morphology, normal masticatory function and good buccal opening. The interposition of cartilage prevents recurrence. The growth potential of the graft due to osteochondral junction activity, allows surgery to be performed in childhood, without requiring a further surgical operation several years later. This constitutes an optimistic prospect for the future and the good results obtained with 8 patients are analyzed.

Bone Lengthening↗
PubMed1989

[History of anatomy in Strasbourg].

When printing came into being, Strasbourg played a crucial role in the dissemination of the knowledge on anatomy, especially with the publication of Brunschwig's famous treatise on surgery in 1497. The first official human dissection in Strasbourg was performed in 1517. The teaching of medicine really began with the establishment of the Academy in 1566, but it was only in 1652 that a specific chair was created for anatomy. The first anatomical theatre was opened in 1670 in a secularized church contiguous to the city hospital. Until 1708, the teaching of anatomy is combined with that of botany; it was only from this date that anatomy was to be associated with surgery, and such was the case until the French Revolution. During the nineteenth century an impressive museum of anatomy was gradually established in Strasbourg. In 1872, after the annexation of Alsace, when the new german university was created, normal and pathological anatomy were separated and each chair attached to a particular institute. The building housing the institutes of normal and pathological anatomy was inaugurated in 1877 and is still used today. In 1919, when the Faculty of medicine was reorganized after Alsace was restored to France, histology and embryology were definitively separated from anatomy. Many famous anatomists worked in Strasbourg, among whom are to be found: J. G. von Andernach (1497-1574), T. Lauth (1758-1826), F. D. Reisseissen (1773-1828), J. F. Lobstein (1777-1835), E. A. Lauth (1803-1837), E. Küss (1815-1871), E. Koeberlé (1828-1915), E. Beaunis (1830-1921), H. D. Bouchard (1833-1899), J. G. Joessel (1838-1892), W. Waldeyer (1836-1921), G. Schwalbe (1844-1916), W. Pfitzner (1853-1903), F. Keibel (1861-1929), A. Forster (1878-1957) and Ph. Bellocq (1888-1962).

Academies and Institutes↗
PubMed1988

[Bichat's fat pad: anatomy and imaging].

Topographic anatomy of the different parts of the corpus adiposum buccae is analyzed by coronal, transverse and sagittal sections. These sections are compared with those realized in the same planes by tomodensitometry and magnetic resonance. This comparison allows a better knowledge of the structures shown by imaging in the superficial and deep facial regions.

Adipose Tissue↗
PubMed1988

[The buccal adipose body (Bichat's fat-pad). Morphological study].

Bichat's fat-pad was examined using dissections of newborns and adults, and histological sections of embryos and fetuses. A main part or body with six extensions (masseteric, superficial temporal, deep temporal, pterygomandibular, sphenopalatine and inferior orbital) can be recognized.

Adipose Tissue↗
PubMed1986

Attempt at systematization in the treatment of isolated fractures of the zygomatic bone: techniques and results.

Two series of cases with isolated zygomatic bone fractures have been compared with regard to the treatment applied and its results, i.e. 258 cases treated by conventional methods, and 437 cases treated by osteosynthesis with miniaturized screwed plates (MSP). In the second series, reduction failure is eight times less frequent than in the first series, and fixation by plates is solid in the three spatial planes. The incidence of postoperative infra-orbital nerve sequelae was diminished by 50% in the second series. This easy, comfortable and efficient method is now used by the authors for the treatment of all unstable zygomatic fractures and in all cases presenting the following functional signs: limited buccal opening, diplopia by trapping, or involvement of the infra-orbital nerve.

Evaluation Studies as Topic↗
PubMed1982

[Microvascularization of retrosternal lymphoid and adipose formations in the child].

The study of young children's retrosternal lobular formations allowed us to distinguish different structures: lymph nodes, adipose lobules, and variable lymphoid formations. The arteries of the lymph nodes are either medullar, cortical or perforating, and the venous net is characterized by existence of perifollicular cortical corbels. The adipose lobules are often made of a mingling of white fat tissue and fetal fat tissue, and in the zones of foetal fat the vascular network is the most developed. The lymphoid formation are of variable structure and microcirculation. Some of them are represented by foetal fat lobules with scattered lymphoid cells, their microvascularization is comparable to microcirculation of fat tissue. Others, are characterized by few lymphoid cells and by development of the connective and reticular tissue; there, the anastomotic venous network is very dilated. Some formations are like lymph nodes, but their sinusal spaces are full of erythrocytes and their microcirculation is peculiar.

Adipose Tissue↗