No abstract available.
Mastoid*

52 types of os temporale had been studied to determine antrum walls on the outside size, from face aditus to ampullae lateral semicircular canals size, antrum ceilling size, from antrum below walls to sigmoid sinus size; antrum radius:on- below, in-out of and before-behind. The understanding of anatomy detail of antrum and its interrelationship will help to avoid the misfortune surgery
Anatomy ; Mastoid

No abstract available.
Aspergillosis* ; Mastoid*

No abstract available.
Dust* ; Mastoid*

No abstract available.
Dust* ; Mastoid*

95% cases of otitis mastoid were sucessfully treated by the reservation and surgery and the rest 5% cases with this were treated by many different methods aiming to management of the hollows of the radical surgery of mastoid bone according to the cause or individuals. The recovering of the partly poor epithelization in the surgical hollow reported effectively. 13 patients received a surgery in the Central Military Hospital 108 during 1987-1996 were studied. The indicators of age, gender, symptoms before receiving operation and status of the surgical hollow were used to classify the result
Mastoid ; Petrous Bone ; surgery

No abstract available.
Mastoid* ; Transverse Sinuses*

BACKGROUND AND OBJECTIVES: Attic cholesteatoma which develops from the papillary or retracted from progresses through various anatomic sites such as the mesotympanium, the mastoid process and the epitympanium. Although the most common site for attic cholesteatoma is the lateral attic space, it has also been found frequently in the medial attic space. We hoped to understand the pathogenesis of attic cholesteatoma through clinical analyses in order to contribute to the cholesteatoma treatment. MATERIALS AND METHODS: We chose 60 attic cholesteatoma patients showing attic retraction or perforation. These cases of attic cholesteatomas were classified into either the lateral or the medial types depedning on the main site of occurence. They were further classified into anterior, posterior and inferior types according to the direction of cholesteatomatic progression. CONCLUSION: The accurate assessment and clear understanding of the pathogenesis of different forms of cholesteatoma enabled a successful operation and helped to minimize the operative field.
Cholesteatoma* ; Hope ; Humans ; Mastoid

OBJECTIVES: The aim of this study was to emphasize the necessity of a standard in segmentation threshold and algorithm for measuring volume and surface area of mastoid air cell system (MACS). METHODS: First, we obtained axial computed tomography scans of 54 normal temporal bones from 27 subjects. Then, we manipulated Hounsfield units (HU) image data in DICOM (digital imaging and communications in medicine) files directly using our program. The volume and surface area of MACS were computed and compared at segmentation thresholds (HU) from -700 to 0 at intervals of 50 using 2 algorithms; square pixel based (SP) algorithm and marching square (MS) algorithm. RESULTS: No significant difference was found between the volumes computed by SP and MS algorithms at each segmentation threshold. The surface area computed by SP algorithm, however, was significantly larger than that by MS algorithm. We could minimize this significant difference through a modification of the SP algorithm. As the lower HU threshold value was set, the smaller volume was measured. The surface area showed a plateau at a threshold of approximately -200 HU. The segmentation threshold had greater influence on the measured volume of MACS than the algorithm did. CONCLUSION: A standard method for measuring volume and surface area of MACS is thought to be necessary. We suggest that the MS algorithm and -200 HU of the threshold could be a standard in the measurement of volume and surface area of MACS.
Mastoid* ; Organ Size ; Temporal Bone

The main two problems in the standard transpetrosal approach are a cosmetic deformity and the cerebrospinal fluid (CSF) leakage. However, until now a few technical innovations has been introduced to overcome these problems. Domestically, there is no reports concerning this technique. We introduce a simple and easy technique of cosmetic reconstruction with a split-thickness mastoid bone flap after transpetrosal approach in three tumorous conditions at cerebellopontine region. This simple technique provides a superior cosmetic result, a significant reduction in uncomfortable symptoms, and a possibility of the CSF leakage.
Cerebrospinal Fluid ; Congenital Abnormalities ; Mastoid