[Temporal bone imaging].

T Kodama

Home/Archive/PubMed

PubMed · 11070969

[Temporal bone imaging].

T Kodama

View original source ↗Export metadata ↓

Abstract

With the advent of high-resolution computed tomography (HRCT), diagnostic imaging has played important roles in the evaluation and management of diseases in the temporal bone. Recent advanced technology such as, multi detector-raw, sub-millimeter slice thickness (0.5 mm), high-speed rotation (0.5 sec/rot), can make more accurate and rapid examination possible. Magnetic resonance imaging (MRI) can provide additional information because of its high contrast of soft tissues. In this article, characteristic findings of several diseases in the temporal bone, such as, anomaly, cholesteatoma, cholesterol granuloma, glomus tumor and other tumors, are presented.

Explore related subjects

Cholesteatoma, Middle Ear Humans Magnetic Resonance Imaging Skull Neoplasms Temporal Bone Tomography, X-Ray Computed Journal Article Review

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

T Kodama. 2000. [Temporal bone imaging].. https://pubmed.ncbi.nlm.nih.gov/11070969/

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2001

Up-regulation of matrix metalloprotease-9 in middle ear cholesteatoma--correlations with growth factor expression in vivo?

The role of matrix metalloproteases and their regulation in the pathology of middle ear cholesteatoma is still unclear. Recently we have demonstrated that incubation of keratinocytes with cholesteatoma debris and granulation tissue extracts causes induction of gelatinase B (matrix metalloproteinase-9, MMP-9) secretion in vitro. Antibodies against a variety of growth factors revealed some inhibitory effect on MMP-9 induction, caused by debris or granulation tissue extracts. In order to investigate the coherence of growth factor expression and matrix metalloproteinase activity in vivo in middle ear cholesteatoma, we performed quantitative gelatin zymographic analysis with tissue homogenates of 37 cholesteatoma and nine external ear canal skin (EACS) samples. Furthermore we quantified levels of the cytokines IL-1alpha, IL-1beta, TNF-alpha, TGF-beta and EGF present in tissue extracts, using enzyme-linked immunosorbent assays (ELISA), and correlated cytokine concentrations with gelatinolytic activities. Zymographic analysis revealed a highly heterogeneous expression of gelatinase A and B in cholesteatoma specimens. As shown previously, MMP-9, but not MMP-2, was increased in cholesteatoma when compared to EACS samples. ELISA studies revealed a significantly elevated IL-1alpha level in cholesteatoma. Regression analysis involving gelatinolytic activity and cytokine concentrations in tissue homogenates showed no statistically significant correlation between expression of gelatinases and the cytokines IL1-alpha, IL1-beta, TNF-alpha, TGF-beta or EGF. The discrepancy between in vitro observations and the situation in vivo is discussed critically.

Cholesteatoma, Middle Ear↗

PubMed2001

[Intraoperative measurement of stapes mobility using a hand-guided electromagnetic probe].

BACKGROUND: The hearing results of otosurgery are still unsatisfactory. Even after successful implantation of middle ear prostheses there often remains an air bone gap of 30 dB or more. As possible reasons dislocation of the prostheses due to scar growth, changes in prostheses' attachment or ventilation disorders are being discussed. Decreased stapes mobility, which has been judged only manually up to now, is supposed to be a further reason. METHOD: We are introducing a new electromagnetic probe. The output signal of this device is proportional to the impedance of the stapes-annular ligament cochlear fluid system at the sensor's resonance frequency (2.4 kHz). The advantage of this system is characterised by its hand-guidance. Injury of the sensitive stapes-annular ligament due to tremor movements of the surgeon can be excluded using a special construction of the sensor head. The maximum force of the sensor's tip onto the stapes during measurement is limited to below 5 mN. RESULTS: Preliminary measurement results of 20 patients are presented with normal and abnormal stapes mobility. These results are compared to the subjective impression of the surgeon, who usually tested the stapes mobility by hand. As a result of our investigations probe measurements can detect more exactly decreased mobility of the stapes than the surgeon. CONCLUSIONS: Our device may help to detect latent stapes fixation caused by chronic inflammation of the middle ear. The intraoperative measurement of stapes mobility may influence the strategy of the surgeon. Furthermore it would be helpful in patient consulting prior to a revision-tympanoplasty with predicting the potential hearing improvement.

Cholesteatoma, Middle Ear↗

PubMed2001

[Cholesteatoma recurrences caused by intraoperative cell seeding? Contact endoscopic and cytologic studies].

BACKGROUND: The high rate of recurrences of cholesteatomas after surgery is mostly caused by insufficient removal of matrix. Another factor may be intraoperative scattering of matrix cells e. g. with the running burr, which later may become the origin of new cholesteatoma growth. In this paper we tried to visualize these cells for gaining further informations. PATIENTS AND METHODS: In 10 patients intraoperative contact endoscopy of the cholesteatoma was carried out during mastoidectomy. After intravital staining with methylene blue the very superficial tissue layers can directly be considered via a contacting endoscope. In addition, sucked-off rinsing fluid was cytologically examined for epithelial cells. RESULTS: Both investigations show only very rare vital squamous cells - besides other cells like or ciliated cells and foreign body giant cells. DISCUSSION AND CONCLUSIONS: Inspite of their small number, these squamous cells in principle could cause dispersed growth of cholesteatoma. However, this seems to be much less significant than the assumption of matrix left behind intraoperatively. The danger of dispersed cell growth can further be diminished by adequate operating techniques with sufficient rinsing, smoothing the bony cavity walls and avoiding blind corners.

Cholesteatoma, Middle Ear↗