[Modification of neck lymph node dissection in squamous cell cancers of the oral cavity].
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Biomedical subjects
Publications and source records attributed to B Norer.
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By definition, ultrasonography images the gross morphology of normal organs and of abnormal connective tissue structures. The site and demarcation of lesions, their topographical relations to other structures and the internal echo patterns are illustrated on the basis of seven clinical cases. The role of sonography in the diagnostic work-up is defined. The choice of treatment is determined by the early detection of a mass and its further appearance in terms of size and echogenicity. Sonography cannot replace histology. This is why so-called "typical" echo patterns may be misinterpreted. For follow-up studies sonography needs to be done in carefully defined planes. For ultrasonography to be helpful in the diagnosis, a full understanding of the patient's history and clinical signs and symptoms in the head and neck region is critical. Prior to sonography these data should, therefore, be elicited by the examiner himself.
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Arthroscopic, macroscopic and histological signs of degenerative changes in the articular disc were found in 228 temporo-mandibular joints from corpses. In this way it was possible to identify a degenerative development series. Three preferred sites are typical of degenerative metaplastic processes: antero-lateral in the fibrocartilaginous section, lateral at the transition between fibrocartilaginous and bilaminar section and postero-central in the bilaminar zone. The beginning of a degenerative process was never detected in other sections of the disc. Degeneration commences in the fibrocartilaginous section with fragmentation of the collagen fibres, destruction of interzellular substance and loss of collagen fibres proceeding from the cranial surface. This leads to thinning, rupture and, finally, to dehiscence. In the bilaminar zone the degeneration develops in the caudal section of the cranial lamella. It leads to ganglia formation due to mucoid liquefaction. After tearing of the cranial lamella the caudal lamella thins down until it finally ruptures. Dehiscence thus occurs dorsally, too.
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