Prevalence of Superior Semicircular Canal Dehiscence in Coronal Images of Temporal Bone Computed Tomography and Its Diagnostic Value in Korean Population / 대한이비인후과학회지

BACKGROUND AND OBJECTIVES: This study aimed to analyze the prevalence of superior semicircular canal dehiscence (SSCD) in the coronal images of high-resolution temporal bone computed tomography (TBCT) and to evaluate the diagnostic accuracy of coronal images for SSCD syndrome. SUBJECTS AND METHOD: We retrospectively reviewed high-resolution TBCT scans of 217 patients (434 ears) with SSCD due to various causes. The dehiscence ratio (slices showing dehiscence/total slices showing the superior semicircular canal) in the coronal images of TBCT was calculated, and the optimal cutoff value for the diagnosis of SSCD syndrome was determined using the receiver operating characteristics (ROC) curve. RESULTS: Of the 434 ears, 64 (14.7%) presented SSCD in more than one slice of the coronal images of TBCT, but only three patients (0.7%) were confirmed with SSCD syndrome. Based on the ROC curve analysis for the dehiscence ratio of 64 ears, the optimal cutoff value for the diagnosis of SSCD syndrome was 0.67 with 100% sensitivity and 90.2% specificity. CONCLUSION: The majority of cases diagnosed with SSCD syndrome using the coronal images of TBCT were asymptomatic or false-positive. The dehiscence ratio in the coronal images of TBCT combined with a typical symptom can be a highly sensitive and specific diagnostic tool for SSCD syndrome.

Correction of the Deviated Nose in Korean Rhinoplasty / 대한이비인후과학회지

BACKGROUND AND OBJECTIVES: The surgical techniques based on the classification system based on Western individuals for the correction of deviated nose should be modified because of the differences in the anatomy of the nose for Korean individuals. To evaluate the usefulness of a classification system that has been designed for the esthetics and deviated nose of Korean individuals, we used that to analyze the surgical outcomes of rhinoplasty for deviated nose for 76 Korean patients. SUBJECTS AND METHOD: Seventy six patients who underwent rhinoplasty for deviated nose between January 2010 and June 2016 were reviewed retrospectively. All patients were classified with Jang's classification system and surgical techniques were analyzed according to the classification. Surgical outcomes were evaluated based on the preoperative and postoperative photo taken of the patient's nose. The degree of nasal deviation, tip projection index, nasofrontal angle and columellar-labial angle were measured. RESULTS: Deviated nose was classified into type I (34%), type II (26%), type III (13%), type IV (9%), and type V (17%). Preoperative and postoperative anthropometric measurements revealed that the mean degree of deviation changed from 8.84° to 3.01° (p < 0.01); the tip projection index changed from 0.54 to 0.58 (p < 0.01), and the degree of nasofrontal angle changed from 131.55° to 133.14° (p < 0.01). Aside from the residual deviations, complications included a shifting of the dorsal graft, an inverted V-deformity from the depression of the middorsum after the spreader graft and incomplete hump removal. CONCLUSION: Analysis based on the said classification system and personal esthetics showed good surgical outcomes for rhinoplasty to correct deviated nose. Therefore, it would be helpful to treat Korean patients for the correction of deviated nose by using both classification system and personal esthetics that are based on Korean individuals.