Search PubMed⌕ Search

Biomedical subjects

H Matras

Publications and source records attributed to H Matras.

At least 37 records · Page 2Linked to original sources
PubMed1977

Different types of benign nerve sheath tumors. Light microscopy, electron microscopy and autoradiography.

In a light-, electronmicroscopic and autoradiographic study different types of nerve sheath tumors were classified. Their cellular population was quantitatively evaluated in the electron microscope. In the neurinoma the predominant cell was found to be the Schwann cell, but in the different types of neurofibromata a variable content of connective tissue cells was noted. T-HE DIFFUSE NEUROFIBROMATA SHOWED A QUANTITATIVE CELLULAR COMPOSITION SIMILAR TO NORMAL PERIPHERAL NERVES. In the plexiform neurofibroma a large number of fibroblasts were present and in the argyrophilic neurofibroma high content of perineurial cells was found. In autoradiographic sections the tumors showed in general a low proliferation rate (L.i. 1-3.6%). In the argyrophilic neurofibrom a higher labelling index (9.5%) was found.

Adolescent↗
PubMed1977

[Clinical, histological and electron microscopic findings in neurofibromatosis (Recklinghausen's disease) occurring in childhood (author's transl)].

A follow-up study was carried out of the clinical symptoms and the radiological and histological alterations in five cases of neurofibromatosis (Recklinghausen's disease) with onset during early childhood. The clinical manifestation of the disease was predominantly restricted to the face. In the histological ultrastructural investigation different types of neurofibroma were detected (plexiform neurofibroma, argyrophilic neurofibroma and diffuse neurofibrma). Preliminary results are presented on the basis of a correlation between the clinical findings and the histological types of neurofibroma with special reference to the demarcation of the tumours, recurrence following surgical removal and the prognosis as to the clinical course of the disease. Nevertheless, definite conclusions will be possible only by continuous observation of a larger number of patients by means of standardized clinical, radiological and histological methods of investigation.

Adolescent↗
PubMed1977

Cephalometric observations in premature craniosynostosis.

Forty patients with premature craniosynostosis of variable extent and severity were subjected to cephalometry. The majority of the children and adolescents involved had undergone bilateral cranial fenestration at age 6 months to 11 years. Lateral cephalometric radiographs were used for analysis. The measurements obtained were compared with normal values of comparable age groups. In two thirds of the patients examined facial skull growth was found to be impaired, the clinical appearance ranging from pronounced faciostenosis to abortive forms. In some cases the clinical appearance was normal. One of the conclusions derived from the cephalometric data is that inhibited growth primarily affects the anterior portions of the skull base, which are found to be shorter than normal. The defect appears to involve the spheno-ethmoidal, intersphenoidal and sphenofrontal synochondroses.

Cephalometry↗
PubMed1977

Management of upper midfacial injuries.

Midfacial fractures may extend into orbital roofs, frontal sinus walls, and ethmoidal and sphenoidal bones if the traumatic impact is of sufficient force. The cranium and facial skull are affected and there is the risk of intracranial complications. Management thus requires a teamwork approach. Isolated compound fractures of the anterior frontal sinus may be reconstructed by direct access through the wound. We prefer a coronal hairline incision in most cases. In isolated (compound) fractures of the orbital roof, combined frontomaxillary fractures without dural involvement, and frontobasal fractures that necessitate an intracranial approach for dural closure, primary upper midfacial reconstruction is attempted. In frontal comminution, preservation of the frontal bone or orbital roof is impossible. Secondary management is indicated after an interval of at least six months for fronto-orbital reconstruction with autologous or alloplastic material.

Adult↗
PubMed1975

Topographical anatomy of the total osteotomy of the midface.

In this study, the operating conditions for total osteotomy of the middle part of the face have been simulated in a cadaver and the topography of the organs at risk has been examined. The area of the maxillary tuberosity is the region which is mainly exposed to considerable injury to vessels; here an uncontrolled fracture as compared with a systematic osteotomy is the safer method under the given anatomical conditions.

Face↗