The impact of endoscopy on the treatment of cholesteatomas

Lima, Thiago de Oliveira; Araújo, Taís Figueiredo de; Soares, Letícia Clemente Alvim; Testa, José Ricardo Gurgel

doi:10.5935/1808-8694.20130090

Cited by 10 publications

(5 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figures 9-11show the dimensionless moisture content distribution inside ellipsoids with aspect ratios b/a = 1.1; 2.0 and 5.0 as a function of the cylindrical coordinates (r, z), during the first continuous drying period in two dimensionless times: Fo=0.006 and 0.015.It was verified in all three cases the existance of high moisture content gradientes near the solid surface, at the beginning of the drying process.The regions where the higher moisture contentgradients are found, correspond to the areas with the highest water loss. These areas also present high temperature gradients.These effects raise the thermal, hydraulic and mechanical stresses and, consequently, the appearance of cracks and deformations in the product, compromising its final quality.Similareffetcs were observed by [9,28,31,32].Comparing Figures 9-11 it was possible to verify that the aspect ratio (shape of solid) directly influences in the drying kinetics. The lower the aspect ratio, the faster the solid will dry before the temperingperiodbegins.…”

supporting

confidence: 83%

Intermittent Drying of Rice Grains with Husk: Modelling and Experimentation

Franco

Lima

Farias

et al. 2020

View full text Add to dashboard Cite

This chapter presents an analytical modeling of mass transfer in wet porous bodies during the continuous and intermittent drying process in fixed bed. The drying process was simulated assuming the liquid diffusion as the only mass transport mechanism and constant mass diffusion coefficient. The presented models involve spherical, cylindrical and prolatespheroidalgeometries. Simulation tests of intermittent drying of ellipsoidal solids were performed and the results were compared with the continuous drying curve in order to evaluate the tempering effect in the drying process optimization. It was possible to simulate the moisture distribution during the tempering period. As an application, the methodology is used to describe intermittent drying of rough rice (BRSMG Conai variety) at temperature of 40°C and tempering periods from 0 to 1 hour. Experimental data were used to estimate the diffusion coefficient. Under the considered operating conditions, it was verified that intermittent drying provides reduction in effective operating time when compared to continuous drying.

show abstract

supporting

confidence: 83%

Intermittent Drying of Rice Grains with Husk: Modelling and Experimentation

Franco

Lima

Farias

et al. 2020

View full text Add to dashboard Cite

show abstract

“…With the advent of widespread dissemination of endoscopic surgery techniques, the use of endoscopes in middle ear surgery has become common. The primary benefit is improved visualization of structures not easily seen with a microscope (9). Because the microscope only provides the surgeon a line of sight, using a beam of light perpendicular to the structures, the deeper located and angled recesses are not easily reached.…”

Section: Discussionmentioning

confidence: 99%

“…The possibility of approaching and magnifying tiny structures, and "looking around corners" ensures a better visualization of the inaccessible compartments, such as the facial nerve recess and tympanic sinus (8). It increases the resolution for the removal of covert keratin fragments, potentially reducing the incidence of residual disease in cholesteatoma surgery (9,10).…”

Section: Introductionmentioning

confidence: 99%

Residual Cholesteatoma After Endoscopic-Assisted Canal Wall-Up Tympanomastoidectomy: A Randomized Controlled Trial

Silva¹,

Costa

Selaimen³

et al. 2022

Otol Neurotol

View full text Add to dashboard Cite

This study aimed to determine the effectiveness of using endoscopes in reducing recidivism secondary to residual cholesteatoma after canal wall-up tympanomastoidectomy. Study Design: Randomized clinical trial. Setting: Tertiary referral center. Patients: Patients with cholesteatoma, aged 7 to 70 years. Interventions: Subjects were randomly allocated into two groups: endoscopic-assisted canal wall-up (EACWU; group 1) and conventional canal wall-up (CWU; group 2) techniques. Pars flaccida and pars tensa subgroups were analyzed according to the anatomic location of cholesteatoma origin. Main Outcome Measures: Presence or absence of residual cholesteatoma, based on second look surgery, diffusion-weighted magnetic resonance imaging, or video-otoscopy at 12 and 18 months after surgery. Results: In total, 57 ears were analyzed: 29 in group 1 and 28 in group 2. Group 1 revealed residual disease in 17.2% of ears, whereas group 2 had residual disease in 35.7% (p > 0.05) of the ears. In the pars tensa cholesteatoma subgroup, the incidence of residual disease was 13.3% for EACWU and 47.1% for the CWU technique (p < 0.05). A tendency of reduced incidence was observed for cholesteatoma due to residual disease using EACWU. In addition, a statistically significant reduction in the residual disease was observed in the subgroup of pars tensa cholesteatomas. In this subgroup, the relative risk was 0.28, and the number needed to treat was 4.6. Conclusion:The use of the endoscope reduces the incidence of recidivism secondary to residual disease in pars tensa cholesteatomas. Endoscopic-assisted surgery may be useful in cases with an indication for canal wall-up tympanomastoidectomy. Level of Evidence: 1b.

show abstract

“…Even after its total removal, the tumor may grow back (LIMA et al, 2013). Therefore, patients need to undergo periodic medical follow-up.…”

Section: Eyes On Health Sciences V02 Atypical Outcome Of Middle Ear C...mentioning

confidence: 99%

Atypical outcome of middle ear cholesteatoma: Case report

Coelho,

Miranda,

Bezerra

et al. 2024

Eyes on Health Sciences V.02

View full text Add to dashboard Cite

The present study aimed to describe a case of middle ear cholesteatoma with recurrence after surgical removal, followed by an atypical outcome. A 40-year-old male patient sought medical attention complaining of otalgia and ear fullness in the left ear. Magnetic resonance imaging showed fluid content and mastoid cells occupying the left tympanic cavity, with foci of diffusion restriction in the tympanic box and antrum measuring about 1.4 cm, which is compatible with left middle ear cholesteatoma. The patient was then submitted to two surgical procedures (an endoscopic tympanoplasty and a closed mastoidectomy), at an interval of four months, to completely remove the tumor. After 3 years and 6 months, the patient had recurrence of cholesteatoma. On the day before the surgery scheduled to remove the recurrent tumor, magnetic resonance imaging revealed the absence of cholesteatoma, suggesting a spontaneous cure. The cure or natural disappearance of the tumour opens new research perspectives for the medical sciences.

show abstract

The impact of endoscopy on the treatment of cholesteatomas

Abstract: Endoscopy has positively impacted the management of cholesteatomas and should be used in cholesteatoma surgery.

Cited by 10 publications

References 19 publications

Intermittent Drying of Rice Grains with Husk: Modelling and Experimentation

Intermittent Drying of Rice Grains with Husk: Modelling and Experimentation

Residual Cholesteatoma After Endoscopic-Assisted Canal Wall-Up Tympanomastoidectomy: A Randomized Controlled Trial

Atypical outcome of middle ear cholesteatoma: Case report

Contact Info

Product

Resources

About