CT manifestations,incidence,etiology and clinical significance of hyperostosis frontalis interna / 实用放射学杂志

Objective To explore the CT manifestations,incidence,etiology and clinical significance of hyperostosis frontalis in-terna (HFI).Methods CT features of 243 cases HFI were analyzed retrospectively.Based on the maximum thickness of the inner table of the frontal bone,HFI was classified into 4 grades as follows:GradeⅠ─ thickness of 2.8-6.0 mm,GradeⅡ─ thickeness of 6.1-10.0 mm,Grade Ⅲ ─ thickness of 10.1-14.0 mm,Grade Ⅳ ─ thickness of greater than 14.1 mm.According to the in-crassating direction,HFI was classified into inward,outward and intermediate type.Results The inner table of the frontal bone was incrassated in all cases (n=243).The thickness ranged between 2.93 mm and 14.64 mm,including GradeⅠin 68 cases (28.0%), GradeⅡin 71 cases (29.2%),Grade Ⅲ in 69 cases (28.4%)and Grade Ⅳ in 35 cases (14.4%).There were inward type in 82 ca-ses (33.7%),outward type in 59 cases (24.3%)and intermediate type in 102 cases (42.0%).The incidence of HFI was 5.47% in postmenopausal women,with 7.14% in overweight and 9.09% in obese women respectively.Conclusion HFI is common in the postmenopausal women,and CT manifestations of HFI are characteristic.

The Value of CT Coronal Scan in Diagnosis of Invasion of Skull Base by Nasopharyngeal Carcinoma / 实用放射学杂志

Objective To evaluate the value of CT coronal scan in diagnosis of invasion of skull base by nasopharyngeal carcinoma(NPC).Methods The status of the skull base of 186 cases with NPC showed by CT coronal and axial scan was analyzed retrospectively,these cases were proved by pathology.Results In the 186 cases of NPC,the invasion of the base of skull wasn't revealed in 98 cases(52.7%)by CT coronal and axial scan.CT coronal scan showed bone invasion in 5 cases(2.7%),while the invasion wasn't recognized by axial scan.By CT coronal scan,the invasion of skull base was confirmed in 9 and excluded in 16 of 25 cases(13.4%)in which the invasion was uncertain by axial scan.Wider and deeper invasion was recognized in 23 cases(12.3%) by coronal scan,though obvious invasion had been diagnosed after axial scan.Accordant invasion was displayed in 35 cases(18.8%) by CT coronal and axial scan.Conclusion CT coronal scan is valuable for demonstrating whether the base of skull is invaded or not and the position,range and degree of the invasion.Only by combining CT axial with coronal scan a complete and objective conclusion can be drawn.