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At least 19 recordsLinked to original sources
PubMed1986

Metastatic seminoma of the temporal bone.

Temporal bone metastasis of classic testicular seminoma is extremely rare in the English literature. Except for a clinical case report of seminoma in the temporal bone, to our knowledge there is no temporal bone pathology report of secondary seminoma. In the left temporal bone of the present case, tumor cell infiltration was found in the external auditory canal, tympanic membrane, middle ear cavity, tympanic and mastoid mucosa, tensor tympani muscle, and so on.

Adult↗
PubMed2003

Descriptive growth model of the height of stapes in the fetus: a histopathological study of the temporal bone.

Temporal bone histological findings can be evaluated from several points of view. The most basic consists of a description of the characteristics and abnormalities of particular temporal bones. The second one is the measurement of various structures in a larger set of temporal bones and the monitoring of these structures over time. The height of stapes was measured in a set of 40 temporal bones from 27 fetuses, and the growth of stapes from the 13th to 36th weeks of pregnancy was determined. A computer-assisted nonlinear regression analysis of diagnostics enabling simultaneous examination of data (influential points, i.e., outliers and leverages) was carried out, a growth curve model proposed and a mathematical method with Ratkowski criteria for estimation applied to find the best descriptive model of the height of stapes versus time y= f(x) growth curve; the results of 13 growth models were examined. It was found that the maximum growth of the height of stapes was between the 13th and the 24th weeks of pregnancy. The average height of stapes was 1.05 mm in the 13th week and 2.6 mm in the 24th week. Later, after the 25th week, the growth of the height of stapes was slower, and the average height in the 30th week was 3.0 mm.

Fetus↗
PubMed1998

[Practice surgery on the artificial temporal bone. Development of temporal bone facsimiles with stereolithography].

Learning microsurgery of the middle ear requires preparations of temporal bones. Ethical and moral restrictions in obtaining specimens make training and research with temporal bone preparations increasingly more difficult. Due to the complex structure of the temporal bone with its communicating cavities, the manufacture of facsimiles up to now has been impossible. Rapid prototyping techniques must be able to produce identical objects from an original one. By using CT scans of temporal bones from anatomic preparations and patients we have been able to reconstruct 3D pictures on a CAD workstation. We are now able to incorporate data in a stereolithographic system to create an anatomic facsimile of the temporal bone. It is possible to produce a considerable number of these facsimiles from the same real object. With this method we can produce models of human structure for medical teaching, training and research. Our artificial preparations of temporal bones correspond to both the material characteristics and anatomic details of human structures, allowing various surgical exercises to be carried out.

Computer Simulation↗
PubMed2000

[Langerhans cell histiocytosis of the temporal bone].

Eosinophilic granuloma (EG) is a localized, benign form of Langerhans' cell histiocytosis. It is the least severe of the histiocytosis syndromes and characterized by lytic lesions of one or more bones. Temporal bone lesions usually occur in association with multifocal disease, but isolated lesions may occur in either the mastoid bone alone or in the entire temporal bone affecting other sites in the body. Two cases of EG of the temporal bone are reported and the literature is reviewed.

Adolescent↗
PubMed1994

Prevalence of microfissures in the human temporal bone: a report of 1000 temporal bones.

A total of 1000 human temporal bones were studied to determine the prevalence of two microfissures: 1. the one between the facial canal and the vestibule, 2. the microfissure between the round window niche (RWN) and the posterior semicircular canal (PSC). Additionally, this study compares the prevalence according to temporal bone age and sex. The microfissure between the facial canal and the vestibule was observed in 470 (47%) temporal bones, with a bilateral presence of 77.2%. The prevalence of this microfissure increases linearly with age. It was not found in any bone within the 0 to 2 age group. It was present in 3 (7.3%) bones from the 2 to 9 age group, as opposed to 374 (54.8%) bones from the 40 and over group. The microfissure between the RWN and the PSC was detected in 915 (91.5%) temporal bones. This second microfissure was found to be an overwhelmingly bilateral entity. The prevalence of this other microfissure also increases with age. This microfissure was also not present in any temporal bone within the 0 to 2 age group. It was found in 28 (68.3%) bones from the 2 to 9 age group, in contrast to 678 (99.4%) temporal bones from the 40+ group.

Adolescent↗
PubMedDate not supplied

Use of reconstructed, non-orthogonal plane, high-resolution computed tomography of the temporal bone in the planning of temporal bone surgery.

OBJECTIVES: To demonstrate the utility of high-resolution computed tomography (HRCT) reconstructed in non-orthogonal planes in the planning of temporal bone surgery. STUDY DESIGN: Qualitative and quantitative comparison of in vivo anatomic measurements between orthogonal and non-orthogonal plane reformatted HRCT of the temporal bone. METHODS: HRCT data of 10 normal temporal bones were reconstructed two-dimensionally in two non-orthogonal planes. Parallel to the plane defined by the superior semicircular canal (defined as transverse) as well as perpendicular to the plane defined by the superior semicircular canal (defined as longitudinal). This was done using commercially available software. Sixteen surgically important relationships between neural, vascular and/or bony structures were measured and analyzed. RESULTS: Quantitatively, wide variations were obtained in the measurements obtained from images of both non-orthogonal planar orientations. These variations were not age or sex dependent. Qualitatively, the images obtained highlight the anatomy of the temporal bone and skull base as it will be encountered during otologic surgery, since the surgical visual axis is along the long axis of the temporal bone. CONCLUSIONS: The reformatted images in non-orthogonal planes were superior to the axial and coronal series because they condensed critical relationships into a single perspective which promoted an intuitive understanding of the surgical approach. These reconstructed images show wide differences in quantitative measurements between surgically relevant landmarks. The protocol can be easily implemented in the clinical setting and is a potentially valuable educational tool. We recommend that non-orthogonal reconstructed images be routinely included with orthogonal temporal bone HRCT scans.

Adult↗
PubMed1982

Use of high resolution thin section CT scanning of the petrous bone in temporal bone anomalies.

High resolution thin section axial CT scans (REVIEW reconstruction ARRANGE reformation--General Electric copyright were utilized to evaluate the petrous bone of 17 patients, ages 3 to 60, with congenital hearing loss. Two scanning protocols were evaluated: 1.5 mm thick sections at 1.5 mm intervals, and 1.5 mm thick sections at 1.0 mm intervals. These protocols were qualitatively compared with regard to 1. visualization of small anatomical structures, and 2. computer reformatted images in coronal and sagittal planes. Our experience suggests this imaging capability is highly useful in th evaluation of congenital ear abnormalities. Seventeen patients were examined with high resolution CT scans. The inner ear abnormalities included varying degrees of Mondini's dysplasia. The large vestibule, the large fenestra into the internal auditory canal, as well as the poor cochlear formation, were seen in these malformations. These studies have allowed a greater degree of accuracy in counseling parents of patients with inner ear malformations. Middle and external ear deformities were also encountered. The imaging technique is capable of demonstrating ossicular deformities, as well as the nature of canal atresias. It is particularly useful in the planning of surgery on some of these patients in that location of the plane of the facial nerve canal can be determined prior to surgery. This provides the ability to determine whether surgery is possible, and if so, the probability of opening the middle ear adequately to obtain appropriate reconstruction. Illustrative cases demonstrate the ease of visualizing the small structures of the inner and middle ear and the ability to review these structures in any plane utilizing the ARRANGE program.

Adolescent↗
PubMed2001

Metastasis of cervical esophageal carcinoma to the temporal bone--a study of the temporal bone histology.

A 49-year-old male developed left abducens nerve palsy as a result of metastatic spread of carcinoma of the cervical esophagus to Rouviere's node and infiltration of the petrous portion of the left temporal bone. Postmortem temporal bone histology revealed that cancer cells had invaded the greater superficial petrosal nerve (GPN), lesser superficial petrosal nerve, tensor tympani muscle (TTM) and the skin covering the anterior wall of the left external auditory meatus. These findings suggest that the carcinoma metastasized from the cervical esophagus to Rouviere's node and directly invaded the middle cranial fossa and then the temporal bone, and further infiltrated the middle ear via perineural invasion.

Carcinoma, Squamous Cell↗
PubMed2003

[Ceramic model for temporal bone exercises--an alternative for human temporal bones?].

BACKGROUND: The complexity of the temporal bone anatomy makes it necessary to train in a model before starting middle ear surgery. The classical object are human cadaver temporal bones, but these are not always available for different reasons. Alternatively in cooperation between the department of otolaryngology, head and neck surgery of the University of Jena and the 3di company Jena, Germany, a calcium sulfate based model was developed. METHODS: During a temporal bone course at the Bugando Medical Centre, Mwanza, Tanzania, these ceramic temporal bone specimens were used for training. Because of the lack of drills, the specimens were worked on in chisel and carving technique. All participants were beginners in ear surgery. Classical procedures in mastoid surgery were performed: Exposing of sigmoid sinus, facial nerve, labyrinth, dura, jugular bulb and internal carotid artery. RESULTS: The temporal bone models were very useful for these exercises. Good exposure was possible for the dura, the facial nerve and the major blood vessels. The possibility of exposing tinier structures like the labyrinth was still insufficient. Nevertheless the understanding of the 3-dimensional anatomy of the temporal bone using the ceramic model was excellent. The relationship of all important anatomical structures could be taught intensively. CONCLUSIONS: Particularly for beginners or in cases where human temporal bones are not available the calcium sulfate based temporal bone is an alternative training model for mastoid and middle ear surgery.

Calcium Sulfate↗
PubMed1991

Histopathology of metastatic temporal bone tumors.

Temporal bone metastasis is now being reported with increasing frequency. To understand the process of temporal bone metastasis, complete histologic evaluation of the temporal bones is essential. In this study, 60 temporal bones from 33 patients were evaluated. Different patterns of temporal bone involvement were noted depending on the mode of spread to the temporal bone. Involvement of the temporal bone usually occurs late in the disease process and is often asymptomatic.

Adolescent↗
PubMed1991

Air in the temporomandibular joint fossa: CT sign of temporal bone fracture.

Temporal bone fractures can be difficult to detect clinically and radiographically. Air is sometimes present in the glenoid fossa of the temporomandibular joint (TMJ) at computed tomography (CT) of acute basilar skull fractures. This study evaluated TMJ fossa air as a sign of temporal bone fracture. Initial CT scans of the head in 114 patients with a diagnosis of basilar skull fracture at discharge were retrospectively reviewed. TMJ fossa air was present in 23 of 114 patients (20.2%) and was bilateral in three patients. Only temporal bone fractures were significantly (P less than .001) associated with TMJ fossa air. Temporal bone fractures were observed at CT in 23 of 26 cases of TMJ fossa air, but in three of 26 cases, TMJ fossa air was the only CT sign of clinically apparent temporal bone fractures. TMJ fossa air is associated with acute temporal bone fracture and may be the only CT sign of an otherwise inconspicuous temporal bone fracture.

Adolescent↗
PubMed1982

The Ontario Temporal Bone Bank program and the University of Toronto Temporal Bone Histopathology Laboratory.

The first temporal bone histopathology laboratory in Canada was established at the University of Toronto in 1966. Its organization is outlined. More than 600 bones have been processed and more than 45 publications produced. These are broadly classified as new discoveries, new techniques of temporal bone processing, clinical pathological case reports, and papers on clinical entities. The laboratory has a major teaching role for the trainee in otolaryngology. The history of the temporal bone bank program in North America and of the Ontario Temporal Bone Bank is outlined.

California↗
PubMed1999

Multiple temporal bone anomalies in isotretinoin syndrome: a temporal bone histopathologic case report.

Vitamin A and its derivatives are known teratogens. To our knowledge, this is the second temporal bone histopathologic report on anomalies related to these substances. A white boy (aged 4 years 5 months at death) was born with a complex central nervous system dysgenesis related to his mother's use of isotretinoin (Accutane) early in pregnancy. Histopathologic examination revealed multiple anomalies in the temporal bones: a narrow external auditory canal, protrusion of bone marrow into the middle ear cavity, anomalies of the ossicles, hypoplasia of the facial nerve, absence of the chorda tympani nerve and the stapedius muscle, anomalies of the membranous labyrinth in the vestibule, a hypoplastic lateral semicircular canal, and a large vestibular aqueduct and endolymphatic sac.

Abnormalities, Drug-Induced↗
PubMed1998

Acute intracranial complications of temporal bone trauma.

Temporal bone trauma can be disastrous for the individual and his or her family. With the increase in violent crime throughout our society, the number of intracranial complications associated with temporal bone injury has increased significantly. Although multiple reports concerning the diagnosis and management of temporal bone trauma have been published, few studies on its intracranial complications have been addressed. In this study, we assessed the cases of 43 patients treated for temporal bone fractures between January 1992 and December 1994. The number of temporal bone fractures increased from 6 in 1992 to 21 in 1994. Twenty-one patients (49%) presented with decreased mental status. Significant alcohol and drug use was documented in 28% and 58% of patients, respectively. The most common radiologic finding was skull and intracranial injury. Thirty-six patients (84%) had at least one abnormal intracranial finding; of these patients, 14 (39%) had more than one abnormal finding on computed tomography. Cerebral midline shift, subarachnoid hemorrhage, subdural hemorrhage, and cerebral edema were the most common radiologic findings. Nineteen patients (44%) required an open neurosurgical procedure, and almost all patients with more than one abnormal radiologic finding underwent neurosurgery (86%). Seven patients required further institutional care after discharge. Four patients died (9% mortality); all the deaths were neurologically related. Mean hospital charges increased from $30,900 in 1992 to $63,000 in 1994.

Adolescent↗
PubMed2002

[Pediatric temporal bone fractures].

Temporal bone trauma are more common nowadays related to sports. We report 2 cases with temporal bone fractures in patients younger than 14 years. They were two male, 9 and 12-year-old respectively, that presented traumatism after accidental falls from lowe height. The first case had a longitudinal temporal bone fracture without hypoacusia or vertigo, whereas the second one had an oblique fracture involving the otic capsule, provoking permanent neurosensorial hearing loss, as well as vertigo and unsteadiness that resolved later, related to a vestibular hyporreflexia. Neither case had facial paresia or paralysis. CT scanning was essential to determine the importance of the trauma. Despite the otic capsule rupture, hearing loss in the second case was only significant over 2 KHz, suggesting a selective cochlear trauma. We present clinical and imaging findings, as well as correlation of audiological and vestibular alterations, reviewing the clinical presentation of temporal bone trauma in children.

Cerebrospinal Fluid Otorrhea↗