蝶形骨洞の発育に関するX線学的研究とくに断層撮影による観察
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Statistical observations based on 752 tomographies of the living subjects including 327 infants and 425 adults were carried out with regard to their sphenoidal sinus development. The results were summarized in the following: In sagittal tomogram, regarding the appearance of the shenoidal sinus, the formation of the sinus was found in 8% of the age group of one year; in 90% of those between 3 to 8 years old group; and in 100% of those over 9 years. For those cases showing the definite appearance of the sphenoid sinus by the sagittal tomogram, the frontal tomogram was also taken. In 36% of 4 year-group proved to have the sphenoidal sinus, and in most of the cases over 5 years old, the sinus could be identified bilaterally.As to study the sphenoidal sinus development chronologically, the roentgenograms of the antero-posterior, vertical and lateral diameters, and also the space-area of the sphenoidal sinus were comparatively studied. The developmental stages of the sinus in the body of the sphenoid bone were also studied. As their increasement of ages, both antero-posterior and lateral diameters of the sinus were increased accordingly, whereas the gradual increase of the vertical diameter could only be seen during the period of childhood and no noticeable developmental increase could be seen be-yond that period. As to the space-area of the sinus, significant developmental increase was noticed between the ages of 3 and 29 years. Among those subjects the individualities were marked, however, the significance of those individual differences was found to be marked in the order of the space-area of the sinus; antero-posterior and lateral diameters; and the vertical diameters.Based on the statistical observations of each agegroups, the various modes of development of the sinus were defined. There upon the fundamental morphological classifications of the development status were attempted. Primarily concerning their shape and the direction of the development, the developmental stages were classified into 10 types (from A to J type) by the sagittal tomogram, and into 6 types (from a to f type) by the frontal tomogram. Thus the schemata were constructed with those two modes of the sinus development.Moreover, an observation was made as to the asymmetry of the shape of the sinus, the rate of occurrence of the asymmetry was observed in the order of the space-area of the sinus, lateral diameter, and vertial diameter.With regard to the positional deviation of the inter-sinus septum, the septum was rarely situated at the median position and was found to be in either on right or on left side of the midline in most of the cases.The positional relationships between the sphenoid sinus and posterior ethmoid cell and the correlationships between the sphenoidal sinus development and the other paranasal sinuses development were also investigated.
- 一般社団法人 日本耳鼻咽喉科学会の論文