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At least 883 records · Page 49Linked to original sources
PubMed2004

[The role of high-resolution CT in the preoperative assessment of chronic otitis media].

OBJECTIVE: To assess the high-resolution CT scan in depicting the middle ear structures. METHOD: The surgical findings of 51 ears operated on were retrospectively compared with the CT findings. The followings were analysed: diagnostic features of chronic otitis media (COM) on CT status of the middle ear structures (ossicles, facial nerve canal, semicircular canals and tegmen tympani), and anatomical variations. RESULT: The radio-surgical agreement was excellent for the malleus (kappa statistics, k = 0.840) and tegmen (0.788), good for the incus (0.700) and semicircular canals (0.56), but poor for the stapes (0.366) and facial nerve dehiscence (0.310). Potential surgical hazards detected by the scans included: Low lying dura, high jugular bulb, anterior lying sigmoid sinus, facial nerve dehiscence and other situations brought about by the destructive nature of the lesion. CONCLUSION: There is a good radio-surgical correlation in COM for most middle ear structures except for the integrity of the facial canal and stapes. The scan alerts the surgeon the potential surgical dangers and complications of disease. High-resolution CT scan should be a routine examination prior to middle ear and mastoid surgery.

Adolescent↗
PubMed2001

The value of pre-operative high resolution CT scans in cholesteatoma surgery.

INTRODUCTION: Cholesteatoma is traditionally diagnosed by otoscopic examination and treated by explorative surgery. The need for imaging in an uncomplicated case is contentious. This study assesses the usefulness of a pre-operative high-resolution CT scan in depicting the status of the middle ear structures in the presence of cholesteatoma. MATERIALS AND METHODS: The surgical findings of 36 ears with cholesteatoma operated on by the first author were retrospectively compared with the CT findings reported on by the second author. The following were analysed: diagnostic features of cholesteatoma on CT, status of the middle ear structures (ossicles, facial nerve canal, semicircular canals and tegmen tympani), and presence of any anatomical variations and disease complications. RESULTS: All cases had at least 1, and 30 cases (83.3%) had all, of the following radiological features: (a) a non-dependent tissue mass, (b) a location typical for cholesteatoma and (c) bony erosion. The radiosurgical agreement was excellent for the malleus (kappa statistics, k=0.83), stapes (0.94) and semicircular canals (0.8), good for the incus (0.62) and tegmen (0.65), but poor for the facial nerve canal (0.3). Potential surgical hazards detected by the scans included: low lying dura, high jugular bulb, anterior lying sigmoid sinus, facial nerve dehiscence and other situations brought about by the destructive nature of the lesion. CONCLUSION: There is good to excellent radiosurgical correlation in cholesteatoma for most middle ear structures except for the integrity of the facial canal. The scan alerts the surgeon to potential surgical dangers and complications of disease. High-resolution CT scan is an important investigative tool prior to cholesteatoma surgery.

Cholesteatoma, Middle Ear↗
PubMed1985

[Position and variations in the position of the canal system in the temporal bone. I. The canals of the pars petrosa between the margo superior and the meatus acusticus internus].

The canals of the temporal bone were measured on 103 objects at different levels. The distances (mean and extremes) were estimated as well as the width of the following: the facial canal, semicircular canals, vestibule, internal acoustic meatus, sigmoid sinus, superior bulb of the jugular vein, carotid canal, eustachian tube, perilymphatic and endolymphatic ducts and sac, glossopharyngeal nerve and mastoid cells.

Genetic Variation↗
PubMed2004

Anatomic limitations of posterior exposure of the sinus tympani.

OBJECTIVE: The sinus tympani is a challenging area for the otologic surgeon to access and from which to remove the disease process. Recently, a posterior approach to the sinus tympani through the mastoid was proposed as an alternative technique in cases of deep sinus tympani. STUDY DESIGN AND SETTING: The posterior approach was performed by dissecting the triangular bony area formed by the facial nerve, lateral semicircular canal, and posterior semicircular canal in 8 temporal bone specimens. RESULTS: The edges of the triangle on the facial nerve and lateral semicircular canal were almost constant at 5 mm. The edge on the posterior semicircular canal was about 4 mm. CONCLUSION: It is possible to expose the sinus tympani from the posterior by careful dissection through this triangle, which has almost constant dimensions.

Ear Diseases↗
PubMed2003

[Clinical review of inner ear malformation].

We had 126 patients with inner ear malformation diagnosed with temporal bone computed tomography (CT) scans at Azabu Triology Hospital between 1996 and 2002. We classified cases of inner ear malformation according to Jackler et al. The incidence of inner ear malformation in our series was as follows; 1. Labyrynthine anomalies 61% (isolated lateral semicircular canal dysplasia 56%, compound semicircular canal dysplasia 4%, semicircular canal aplasia 1%), 2. Cochlear anomalies 24%, 3. Enlargement of the vestibular aqueduct 12%, 4. Narrow internal auditory canal 2%, 5. Complete labyrinthine aplasia 1%, 6. Enlargement of the cochlear aqueduct 0%. The most frequent anomaly was isolated lateral semicircular canal dysplasia. We did not detect any significant clinical features in this anomaly. There were 2 patients with cochlear anomalies who had past histories of meningitis. Some patients with enlargement of the vestibular aqueduct had frequent attacks of fluctuating hearing. Clinically it is important to detect patients with inner ear malformation such as cochlear anomalies and enlargement of the vestibular aqueduct usually accompanied by congenital sensorineural hearing loss. For patients with congenital sensorineural hearing loss, we recommend temporal bone CT scan.

Adolescent↗