Some structures are discussed in more detail with emphasis on related pathology. Hrct scan of temporal bone depicts complex bony details and associated soft tissue pathologies accurately. Role of high resolution computed tomography hcrt in. Pediatric temporal bone langerhans cell histiocytosis. Imaging of inflammatory and infectious diseases in the. Hrct temporal bone scan axial section showing longitudinal fracture involving right mastoid bone with middle ear fluid collection.
The objective was to evaluate preoperative hrct temporal bone and to determine its usefulness in. Developmental abnormalities of the temporal bone were evaluated by jahrsdoerfers computed tomography ct scoring system using high. Sections parallel to the hard palate direct coronal plane patient head extended in prone or supine with 105 degree plane is perpendicular to the lateral scc sections are parallel to posterior wall of maxillary sinus. Thus, hrct temporal bone will help the surgeon in planning effective surgical strategy, reducing morbidity during the surgery. The temporal bone is ossified from eight centers, exclusive of those for the internal ear and the tympanic ossicles. Is hrct temporal bone necessary in all cases of active. Hrct temporal bone with eustachian tube multiplanar reconstruction ge revolution acts ex 16 slice ct machine usa was done in all patients. Efficacy of hrct imaging vs spectct scans in the staging. The temporal bones are a pair of bilateral, symmetrical bones that constitute a large portion of the lateral wall and base of the skull. Role of hrct in temporal bone diseases a study of 100 cases. For findings such as stapes erosion and facial canal erosion on hrct, a sensitivity of 68. Temporal bone complications are more common than intracranial complications.
Ct scan of the chest explained clearly high resolution ct scan hrct duration. Arachnoid granulations of the posterior temporal bone wall. Diagnostic imaging pathways high resolution computed tomography hrct of the lung highresolution computed tomography hrct is a widely used technique to image various lung. Slices with maximum visibility of the round window niche rwn and rwm were selected to measure the following. High resolution computed tomography hrct is highly effective in demonstrating the anatomy. Highresolution computed tomography of the temporal bone. Such studies allow one to evaluate the extent of the. Trauma historically, temporal bone fractures were classified into two main categories, longitudinal and transverse, on the basis of the fracture plane relative to the long axis of the petrous. Temporal bone is very difficult to access by clinical examination and normal radiograph. Though the highresolution ct hrct could identify the inner structures of temporal bone, its tiny parts could hardly be observed accurately and clearly by the imaging examinations of. The anatomical complexity of the temporal bone represents a.
Hrct findings were compared with operative features. High resolution computed tomography of the temporal bone in. In this article, hrct findings in csom and its complications are detailed. On hrct examinations of the temporal bone, arachnoid granulations present as erosions in the posterior temporal bone wall, without mass, often with a lobulated surface, and with an. Because of its many important and diverse functions imaging of temporal bone has been of great. Diagnostic imaging pathways high resolution computed. The temporal bones comprise the lateral skull base, forming portions of the middle and posterior fossae.
Diagnostic protocol for detecting otosclerosis on highresolution temporal bone ct lisa a. Its role in the evaluation of middle ear disease american journal of otolaryngology, vol. Preoperative temporal bone hrct and intraoperative. The human temporal bone is an extremely complex structure that contains the organs of hearing and balance with many other components as major vessels and nerves coursing through it. Highresolution computed tomography of temporal bone. It is also in direct contact with vital cranial structures that include the brainstem, cerebellum, temporal lobe etc. Nect axial section showing a welldefined hyper dense. Role of hrct in temporal bone diseases a study of 100 cases abstract high resolution computed tomogram h rct is a modality of routine computed tomogram. In temporal bone it precisely delineates the bony structures as well as the soft tissue component. Diagnostic protocol for detecting otosclerosis on high. Hrct with oblique reconstructions, a modification of routine ct provides a direct visual window into. Highresolution computed tomography hrct is the modality of choice for imaging of bony lesions of temporal region. Due to various limitations of clinical examination and radiography, hrct.
Each temporal bone is composed of five osseous parts. High resolution computed tomography of temporal bone in the. On the right, the external auditory canal, mastoid complexes, and middle. Hrct temporl bone findings in csom, paripex indian. Correlation between hrct temporal bone findings and. Highresolution computed tomography study of temporal. Role of hrct imaging in predicting the visibility of round window. The squamous portion forms a part of the lateral aspect of the cranial vault, and the. Thinsection hrct scan 1 mm in both axial and direct planes or, more commonly, reconstructed coronal plane is the imaging modality of choice to assess for temporal bone involvement and to visualize bony. In this regard, highresolution computed tomography hrct of the temporal bone provides valuable data since it can determine the cholesteatoma tissue and its extent, and assess the ossicles, facial canal. Evaluation of temporal bone in cholesteatoma patients by. The temporal bone is a pair of bones on the sides of the human skull which houses the middle and inner ear.
However, imaging parameters are chosen so as to maximize spatial resolution. Herein, we employ hrct to evaluate and describe the bony anatomy of the porcine tb and lateral skull base. Role of high resolution computed tomography of temporal. We conclude that hrct is an excellent diagnostic modality and should be used liberally to evaluate the temporal bone in children.
Journal of clinical imaging science hrct correlation. They are highly irregular bones with extensive muscular. The prognosis of patients with malignant external otitis meo depends on the extent of the inflammatory changes in the temporal bone and skull base. A temporal bone hrct without contrast axial and coronal view was performed before surgery in all 36 patients using a shimatzu 7800tc computed tomography scan in 2 mm cuts, and.
Planes of scanning axial 30 degrees to anthropological base line parallel to lateral scc. The middle ear consists of the tympanic cavity and. It involves inflammation of the mastoid air cell system also due to. Langerhans cell histiocytosis is a rare multiorgan disorder, commonly seen in the pediatric age group. To assess the usefulness of high resolution computed tomography hrct temporal bones in cases of active squamous chronic otitis media com. Plain hrct temporal bone was done using 64 slice multidetector ct scan with axial, coronal and sagittal reconstruction in high bony algorithm and whenever required soft tissue window settings. Hrct temporal bone is useful to detect the extent of the disease, various complications, and guide the surgeon for preoperative planning.
Wed like to understand how you use our websites in order to improve them. Otosclerosis is an otodystrophy of the otic capsule and is a cause of conductive, mixed or sensorineural hearing loss in the 2nd to 4th decades of life. High resolution computed tomography of the temporal bone. Inflammatory and infectious diseases of the temporal bone are a major indication to perform highresolution ct hrct and mr imaging studies. The prevalence of tympanic plate fractures, which are associated with an increased risk of external auditory canal stenosis following temporal bone trauma. The temporal bone is one of the most important calvarial and skull base bones.
Discussion hrct plays an important role in the radiographic assessment of temporal bone and is helpful in diagnosis and treatment of temporal bone diseases. High resolution computed tomography atlas of the porcine. The temporal bones were scanned in the direct axial and coronal planes using high resolution thin slices without contrast. Ct is the imaging modality of choice for most of the pathologic conditions of the temporal bone, especially for those of the middle ear. Several intrinsic channels, intrinsic fissures, and extrinsic sutures are often apparent on ct images and can mimic. Evaluation and significance of eustachian tube angles and. Highresolution multidetector and cone beam ct were used to image porcine. Pdf anatomical characteristics of temporal bone on. Imaging innovations in temporal bone disorders pdf free. The study of hrct and mri temporal bone findings in. Cureus cautionary highresolution computed tomography. This gallery of images presents the anatomy of the temporal bone by means of ctscan reconstructions. Ct scan of the temporal bone price in hyderabad at doctorc.
To determine the accuracy of high resolution computer tomography hrct temporal bone measurements in predicting the actual visualization of round window niche as viewed. The aim of this presentation is to demonstrate imaging findings of common diseases of the temporal bone. Chronic otitis media com is an inflammation of the middle ear cleft of long duration. Mr imaging appearance of temporal bone after surgery for chronic otitis media cholesteatoma nflammatory.
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