Correlation between temporal bone pneumatization, location of lateral sinus and length of the mastoid process

1992 ◽  
Vol 106 (6) ◽  
pp. 485-489 ◽  
Author(s):  
S. Turgut ◽  
M. Tos
Keyword(s):  
Temporal Bone ◽  
Middle Ear ◽  
External Auditory Canal ◽  
Sigmoid Sinus ◽  
Mastoid Process ◽  
Lateral Sinus ◽  
Gross Pathology ◽  
Significant Difference ◽  
Temporal Bone Pneumatization ◽  
Temporal Bones

AbstractThe relationship between temporal bone pneumatization and the location of the lateral sinus and length of the mastoid process was investigated in 60 fresh frozen adult temporal bones, by plain X-rays, computed tomography and surgical dissection including otomicroscopic findings. Temporal bone pneumatization was classified as small, moderate and large. After drilling, the shortest distances between the middle fossa dura and mastoid tip representing the mastoid length and between the sigmoid sinus and posterior border of external auditory canal were measured and compared to the degree of pneumatization. The distances in the specimens with pathological eardrum and adhesions in the middle ear were compared to the ones without gross pathology. The length of mastoid process was significantly shorter in specimens with small pneumatization than those with large (Mann Whitney P<0.001).The specimens with a pathological eardrum and middle ear adhesions had a significantly shorter mastoid length than those without gross pathology. There was no significant difference between degree of pneumatization and the shortest distance between sigmoid sinus and external auditory canal (Mann Whitney P>0.05). It is demonstrated that the ‘under-developed’ mastoid process can be a consequence of hampered pneumatization.

scholarly journals Morphometry of the Digastric Ridge and Its Significance for Mastoid Surgeries—A Cadaveric Study

2019 ◽  
pp. 014556131987049
Author(s):  
David Victor Kumar Irugu ◽  
Anup Singh ◽  
Rajeev Kumar
Keyword(s):  
Facial Nerve ◽  
Temporal Bone ◽  
Sigmoid Sinus ◽  
Risk Of Injury ◽  
Temporal Bone Pneumatization ◽  
Important Landmark ◽  
The Mean ◽  
Temporal Bones ◽  
Digital Caliper ◽  
Reduced Risk

Objective: Digastric ridge (DR) is an important landmark to locate facial nerve (FN) and sigmoid sinus for mastoid surgeries and transmastoid approaches. We aim to look for the effect of temporal bone pneumatization on the morphometry of the DR and its relation to the adjoining structures. Methods: Temporal bones were harvested from unclaimed cadavers after the approval of the ethical committee. The dissection of the temporal bones was performed under a microscope, and the length of the DR and the distance between the mastoid segment of the FN and the anterior end of DR (FN-DR distance) were measured using a digital caliper. Stata version 14.0 was used to perform the statistical calculations. Results: Ninety-three temporal bones were microdissected (right:left = 47:46; well pneumatized:poorly pneumatized = 58:35). Mean length of the DR was 17.1 mm and was significantly longer in well-pneumatized bones ( P = .0000). The mean distance between the anterior end of the digastric ridge and the mastoid part of the facial nerve was 4 mm. The distance was significantly more in well-pneumatized bones. Conclusion: Prominence and the length of the DR, as well as the FN-DR distance, are significantly more in well-pneumatized bones compared to poorly pneumatized bones. This finding has potential surgical implications with reduced risk of injury to the FN resulting from a conspicuous DR in well-pneumatized bones.

scholarly journals Temporal Bone Pneumatization and Pulsatile Tinnitus Caused by Sigmoid Sinus Diverticulum and/or Dehiscence

2015 ◽  
Vol 2015 ◽  
pp. 1-4 ◽  
Author(s):  
Liu Wenjuan ◽  
Liu Zhaohui ◽  
Zheng Ning ◽  
Zhao Pengfei ◽  
Dong Cheng ◽  
...  
Keyword(s):  
Temporal Bone ◽  
Sigmoid Sinus ◽  
Healthy People ◽  
Pulsatile Tinnitus ◽  
Contrast Enhanced Ct ◽  
Significant Difference ◽  
Temporal Bone Pneumatization ◽  
Grade Ii ◽  
Air Cells ◽  
Grade Iii

Background. Although air cells within temporal bone may play an important role in the transmission of pulsatile tinnitus (PT) noise, it has not been studied systematically.Purpose. To evaluate the difference in temporal bone pneumatization between PT patients with sigmoid sinus diverticulum and/or dehiscence (SSDD) and healthy people.Material and Methods. A total of 199 unilateral persistent PT patients with SSDD and 302 control subjects underwent dual-phase contrast-enhanced CT (DP-CECT), to assess the grade of temporal bone pneumatization in each ear.Results. In the bilateral temporal bone of 302 controls, 16 ears were grade I, 53 were grade II, 141 were grade III, and 394 were grade IV. Among the affected ears of 199 PT cases, 1 ear was grade I, 18 were grade II, 53 were grade III, and 127 were grade IV. There was no significant difference in the pneumatization grade between the affected PT ear and either ear in the healthy subjects(p>0.05).  Conclusion. Although air cells within the temporal bone are an important factor in the occurrence of PT, its severity does not differ significantly from the pneumatization of healthy people.

ANATOMICAL TOPOGRAPHIC FEATURES OF THE FACIAL NERVE ON CONE-BEAM CT

2019 ◽  
Vol 25 (3) ◽  
pp. 46-52
Author(s):  
A.A. Zubareva ◽  
◽  
Zh.Y. Beiseyeva ◽  
Keyword(s):  
Facial Nerve ◽  
Retrospective Analysis ◽  
Temporal Bone ◽  
Middle Ear ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Horizontal Semicircular Canal ◽  
Significant Difference ◽  
Group 2 ◽  
Temporal Bones

Introduction. Cone-beam computer tomography (CBCT) was introduced into the ENT practice more than 10 years ago. In recent years, it is actively used to visualize temporal bones in acute and chronic diseases of the middle ear (especially in visualizing implants of the middle and inner ear, shunts), but there is no precise description of anatomical features of the temporal bone’s structure. Materials and methods. A retrospective analysis of tomogram, made on a Sirona tomograph, Galaxis / Galileos software for the period from 08/04/2016 to 23/06/2017, in overall, there was analyzed 82 images, from which 71 images of temporal bones were selected from 41 people. Group 1 - CT of the temporal bone in patients with signs of acute inflammation of the middle ear, group 2 - CT of the temporal bone in patients with signs of chronic inflammation of the middle ear, group 3 - CT of the temporal bone in patients without signs of inflammation. Results. An algorithm for assessing the temporal bone according to the above parameters is(was) proposed. When three groups were compared, the length of the mastoid and drum part of the facial nerve, the canal of the facial nerve near the aditus ad antrum and the horizontal semicircular canal were revealed, and the distance between them, regardless to the progress of the disease, corresponds to the parameters of the norm. Conclusion. Thus, taking into account the data of the retrospective analysis, it should be noted that there was no significant difference between the quantitative indices of the facial nerve’s canal structure without inflammation and in the acute and chronic pathology of the middle ear

Unusual cases of congenital cholesteatoma of the ear

1999 ◽  
Vol 113 (1) ◽  
pp. 52-54 ◽  
Author(s):  
Usama Rashad ◽  
Maurice Hawthorne ◽  
Udhaya Kumar ◽  
Andrée Welsh
Keyword(s):  
Surgical Treatment ◽  
Temporal Bone ◽  
Middle Ear ◽  
External Auditory Canal ◽  
Cerebellopontine Angle ◽  
Mastoid Process ◽  
Petrous Apex ◽  
Common Site ◽  
Radiological Findings ◽  
Congenital Cholesteatoma

AbstractCongenital cholesteatoma may originate at various sites in the temporal bone. For example, in the petrous apex, the cerebellopontine angle, the middle ear cavity, the mastoid process or the external auditory canal. The least common site being the mastoid process. We present two cases of congenital cholesteatoma of the mastoid process, each presenting with different symptoms and at different ages. Both patients underwent surgical treatment, which confirmed the diagnosis and radiological findings.

Does tranexamic acid improve intra-operative visualisation in endoscopic ear surgery? A double-blind, randomised, controlled trial

2019 ◽  
Vol 133 (12) ◽  
pp. 1033-1037 ◽  
Author(s):  
A Das ◽  
S Mitra ◽  
D Ghosh ◽  
S Kumar ◽  
A Sengupta
Keyword(s):  
Tranexamic Acid ◽  
Middle Ear ◽  
External Auditory Canal ◽  
Soft Tissues ◽  
Controlled Trial ◽  
Control Group ◽  
Endoscopic Ear Surgery ◽  
Ear Surgery ◽  
Significant Difference ◽  
Surgical Field

AbstractObjectiveTo assess the effect of tranexamic acid on intra-operative bleeding and surgical field visualisation.MethodsFifty patients undergoing various endoscopic ear surgical procedures, including endoscopic tympanoplasty, endoscopic atticotomy or mastoidectomy, endoscopic ossiculoplasty, and endoscopic stapedotomy, were randomly assigned to: a study group that received tranexamic acid or a control group which received normal saline. The intra-operative bleeding and operative field visualisation was graded using the Das and Mitra endoscopic ear surgery bleeding and field visibility score, which was separately analysed for the external auditory canal and the middle ear.ResultsThe Das and Mitra score was better (p < 0.05) in the group that received tranexamic acid as a haemostat when working in the external auditory canal; with respect to the middle ear, no statistically significant difference was found between the two agents. Mean values for mean arterial pressure, heart rate and surgical time were comparable in both groups, with no statistically significant differences.ConclusionTranexamic acid appears to be an effective haemostat in endoscopic ear surgery, thus improving surgical field visualisation, especially during manipulation of the external auditory canal soft tissues.

Safety and Efficacy of Chitosan-Dextran Hydrogel in the Middle Ear in an Animal Model

2016 ◽  
Vol 21 (4) ◽  
pp. 254-260
Author(s):  
Selin Ünsaler ◽  
Bora Başaran ◽  
Şule Öztürk Sarı ◽  
Eyüp Kara ◽  
Kemal Değer ◽  
...  
Keyword(s):  
Middle Ear ◽  
Auditory Brainstem ◽  
Contralateral Side ◽  
Auditory Brainstem Responses ◽  
Control Group ◽  
Ear Surgery ◽  
Significant Difference ◽  
Intratympanic Injection ◽  
Temporal Bones ◽  
Histopathologic Findings

Objectives: To investigate the efficacy of chitosan-dextran hydrogel (CDH) in preventing postoperative adhesions between the tympanic membrane (TM) and intratympanic structures, and to evaluate its ototoxicity in an animal study. Methods: In the first step, ototoxicity was evaluated with 7 male albino guinea pigs (GPs) via auditory brainstem responses (ABR) before and 4 weeks after unilateral intratympanic injection of CDH and saline solution contralaterally. In the second step, 12 GPs underwent bilateral ear surgery. The middle ear (ME) mucosa was abraded, and the cavity was filled with CDH on one side and packed with Gelfoam on the contralateral side. A control group of 6 GPs underwent the same procedure except that no material was applied in the ME. The animals were euthanized at the end of the 7th week, and otomicroscopic findings were noted and the temporal bones harvested for the histologic examination. The findings were scored and compared. Results: There was no statistically significant difference between the pre- and postoperative ABR thresholds. In the otomicroscopic findings, the most prominent difference between the two groups was the presence of retraction of the TM in the Gelfoam group. The histopathologic findings revealed a higher degree of inflammation in the Gelfoam group compared with the CDH group. Conclusion: This study demonstrated that CDH has no ototoxic effects in GPs. Its use as an ME packing material revealed significantly less TM retraction and inflammatory reaction compared with Gelfoam.

Temporal bone Pneumatization in Otosclerosis

2008 ◽  
Vol 139 (6) ◽  
pp. 850-853 ◽  
Author(s):  
Daniel T. Ganc ◽  
Robert W. Jyung
Keyword(s):  
Temporal Bone ◽  
Statistical Significance ◽  
Three Dimensional ◽  
Neck Surgery ◽  
Adult Patients ◽  
Control Group ◽  
Test Analysis ◽  
Temporal Bone Pneumatization ◽  
History Of ◽  
Temporal Bones

Objectives To determine whether there is a difference in the pneumatization of temporal bones with otosclerosis versus normal temporal bones. Methods A retrospective study of 46 ears from 24 adult patients with otosclerosis and 64 ears from 47 adult patients in a control group. The study group included temporal bone CT scans available from patients with otosclerosis. The control group consisted of patients who had temporal bone CTs for reasons likely unrelated to a history of middle ear disease. Data were obtained with a virtual reality system that allows three-dimensional manipulation and analysis. Results The temporal bone pneumatization for the otosclerosis group was 4.82 ± 2.27 cm3 vs 6.06 ± 2.71 cm3 for the control group. Two-sample t test analysis revealed no statistical significance ( P = 0.059) between pneumatization in the control vs otosclerosis groups. Conclusion There is no difference in temporal bone pneumatization between patients with otosclerosis and a control population. Therefore, temporal bone pneumatization by itself is not an adequate explanation for the apparent protective effect of otosclerosis against otitis media. © 2008 American Academy of Otolaryngology-Head and Neck Surgery Foundation. All rights reserved.

Distribution and Density of Goblet Cells in the Normal Adult Human Middle Ear

1973 ◽  
Vol 82 (2) ◽  
pp. 240-247 ◽  
Author(s):  
K. Bak-Pedersen ◽  
M. Tos
Keyword(s):  
Cell Density ◽  
Middle Ear ◽  
Goblet Cell ◽  
Anterior Part ◽  
Goblet Cells ◽  
Mastoid Process ◽  
Clinically Normal ◽  
Normal Series ◽  
Temporal Bones ◽  
Goblet Cell Density

The purpose of this study was to map the distribution and density of goblet cells in the clinically normal middle ear. From 12 temporal bones, derived from 12 adult patients with clinically normal middle ears, the mucosa was prepared and stained by the PAS-alcian blue whole-mount method. In six of the patients the middle ears with meticulous gross and microscopic investigation showed mild sequelae of previous otitis media, called the slightly abnormal series, whereas the other six patients who had entirely normal middle ears were designated the normal series. Each middle ear was investigated in 12 different areas: tympanic orifice, hypotympanum anteriorly and posteriorly, round window niche, oval window niche, promontory anteriorly, in the middle, and posteriorly, epitympanum, antrum, and mastoid process. In each middle ear area the goblet-cell density and distribution were determined on the basis of 30 to 50 counts of 0.01768 mm2 epithelial surface, a total of at least 4800 counts. In six patients goblet cells were found in all 12 areas, in three patients in 11, and in three patients in 10. In both series there was a distinct decrease in goblet-cell density from the tympanic orifice, towards the posterior areas of the middle ear and the mastoid process. However, two patients of the slightly abnormal series exhibited a considerably greater density in the posterior than in the anterior part of the hypotympanum. The mean goblet-cell density in the slightly abnormal series was distinctly greater in all middle ear areas than in the normal series. Correspondingly, goblet cells were demonstrated in the antrum and mastoid process in all patients of the slightly abnormal series, but in only half of the normal series. Therefore, the greater goblet-cell density in the slightly abnormal series presumaby results from a previous past disease condition of the middle ear.

Morphometric analysis of anatomical relationships of the facial nerve for mastoid surgery

2001 ◽  
Vol 115 (6) ◽  
pp. 447-449 ◽  
Author(s):  
Asim Aslan ◽  
Cihan Goktan ◽  
Mevlut Okumus ◽  
Serdar Tarhan ◽  
Halis Unlu
Keyword(s):  
High Resolution ◽  
Facial Nerve ◽  
Temporal Bone ◽  
Morphometric Analysis ◽  
External Auditory Canal ◽  
Lateral Surface ◽  
Sigmoid Sinus ◽  
Ct Scans ◽  
The Right ◽  
Mastoid Surgery

Surgical anatomical relationships of the facial nerve (FN) with several landmarks used in mastoid surgery were studied in temporal bone axial high resolution CT scans of 90 patients (180 ears). The shortest distances between the FN and external auditory canal (EAC), sigmoid sinus (SS), posterior fossa dural plate (PFD), and joint of the bony EAC with the lateral surface of the mastoid (M) were measured. These measurements were also analysed in respect of pneumatization and side differences. On average, it was found that FN–EAC was 2.9 mm, FN–SS was 10.5 mm, FN–PFD was 7.3 mm and FN–M was 15.3 mm. FN–EAC was found to be longer in poorly pneumatized bones whereas other distances were longer in pneumatized bones. FN–M was found to be longer on the right side.

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