Sixty-two patients with different temporal bone lesions were prospectively examined by high-resolution computed tomography (CT) and conventional plain radiography, including pluridirectional tomography. High-resolution CT enabled a clear diagnosis in 80% of cases, conventional radiology in 63%; 1.6-times more bone information was recorded by high-resolution CT which is clearly superior for imaging cholesteatomas, metastases and inflammatory processes and for evaluating osseous destruction. With regard to pathological soft tissue or effusions filling the tympanic cavities, conventional radiology shows poor sensitivity (0.61). High-resolution CT is the most sensitive method for the imaging and classification of temporal bone fractures, including labyrinthine damage and ossicular chain injuries. Only in cases of atypical fractures with an unfavourable relationship to the CT planes, can carefully directed tomography be more effective. In most cases high-resolution CT replaces conventional radiology and should be the method of choice for comprehensive radiological examination of the temporal bone.
Einleitung Die pratherapeutische Diagnostik von Kopf-Hals-Tumoren wurde in den letzten Jahren durch Computertomographie (CT), B-Mode-Ultrasonographie (US) und Kernspintomographie (MRI = Magnetic Resonance Imaging) erweitert. Im Gegensatz zur CT, die auf unterschiedlichen Absorptionseigenschaften der Gewebe für Rontgenstrahlen beruht, nutzt die MRI die unterschiedliche Konzentration der Protonen der Gewebe und ihre Eigenschaften im Gitterverband zur Kontrastgebung aus (Einfuhrung in die Methode bei Roth, 1984). Die grundsatzlichen Vorteile liegen in der fehlenden Strahlenbelastung, der guten Kontrastierung benachbarter Gewebsstrukturen mit extremen Dichteunterschieden und in der beliebig wãhlbaren Schnittebene im dreidimensionalen Raum. Dagegen wird die klinische Evaluierung der Methode durch die Vielzahl der frei wählbaren und der die Bildgebung bestimmenden Parameter erheblich erschwert (Tausch-Trem! und Axhausen, 1985). Wie die bisher veröffentlichten Fallberichte zeigen, gelingt eine sehr gute Darstellung einzelner Tumoren, wãhrend sich andere ganz dem MRI entziehen (Mees u. Mitarb., 1984 und 1985; Lindemann u. Mitarb., 1985). Ziel unserer klinischen Studie war es daher, an einem groIen Kollektiv von Patienten mit Malignomen im Kopf-Hals-Bereich den aktuellen pratherapeutischen Stellenwert der MRI in der Diagnostik dieser Tumoren hinsichtlich Ausdehnung und Lymphknotenstatus im Vergleich mit dem klinischen Befund, der CT und dem US zu evaluieren. Patientengut und Methodik Es wurden 36 Patienten der Univ. HNO-Klinik Heidelberg, 34 Manner und 2 Frauen, mit histologisch gesicherten Plattenepithelkarzinomen im Kopf-HaIs-Bereich in die Studie aufgenommen. Die Verteilung der Hauptiokalisationen der Tumoren ist in Tab. 1 wiedergegeben. Bei regionenubergreifenden Prozessen wurde der Tumor derjenigen Region zugeordnet, die hauptsachlich betroffen war. Herrn Prof. Dr. H.-G. Boenninghaus zum 65. Geburtstag gewidmet. * * Auszugsweise vorgetragen auf der 69. Versammlung der Vereinigung SOdwestdeutscher Hals-Nasen-Ohrenãrzte Karlsruhe, 27.-29. 9. 1985 Pratherapeutisch wurden em MRI, em CT und em us innerhaib von 2
From 1984 to 1987, seventy-two patients with squamous cell carcinomas involving oropharynx, hypopharynx, larynx and cervical lymph nodes, who underwent surgery, were examined to determine the value of computed tomography (CT), magnetic resonance (MR), high-resolution real-time sonography (US) and palpation in preoperative staging of cervical nodal metastases. The clinical staging was compared with the microscopic findings in the neck specimens and with operative reports. For the identification and description of cervical lymph node metastases, US and CT are more valuable than MR and palpation. In comparison to CT, however, US has advantages in most cervical areas as a dynamic method with variable representation of interesting regions. False positive errors are related to confusion with inflammatory nodes in all examinations. Metastatic infiltration of surrounding tissue especially of neck vessels, are best recognised by means of US and MR. However, the high rates of sensitivity and low rates of specificity of all methods point to the possibility of a great number of false positive errors in demonstrating tissue infiltration.
High-resolution CT, using fine sections, is a valuable method for radiological examination of the petrous bone. A standardized method of examination using the orbitomeatal and coronary plane is adequate for detailed screening of the petrous bone and shows almost all structures with high accuracy. The sensitivity of the method for showing 35 sub-structures of the inner and middle ear was investigated by examining 40 petrous bones which were normal clinically and radiologically, using the orbito-meatal and coronary planes. The radiation dose to the lens is less than from pluri-directional tomography. For special problems and for demonstrating very small structures, cuts may have to be performed in other planes, suitable for the required topography.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.