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Do, Kyung-Hyun,Lee, Jin Seong,Colby, Thomas V,Kitaichi, Masanori,Kim, Dong Soon Lippincott Williams Wilkins, Inc. 2005 Journal of computer assisted tomography Vol.29 No.4
OBJECTIVE:: To assess the capability of the density histogram of high-resolution CT (HRCT) in differentiating nonspecific interstitial pneumonia (NSIP) from usual interstitial pneumonia (UIP) without definite honeycombing. METHODS:: Twenty-eight NSIP and 32 UIP patients without definite honeycombing on CT were included in this study. We evaluated a CT image at the level of 1 cm above the diaphragm. The pixels of the lung parenchyma were classified into 4 ranges. The fractions of each range of corresponding density were calculated. The skewness (the degree of asymmetry of a distribution) and kurtosis (how sharply peaked a histogram is) were obtained from the density histogram. The mean value and the mode value of the lung attenuation were also measured. RESULTS:: The fraction of the range of ground-glass opacity and reticular opacity was greater in NSIP patients (32%, 12%) than in UIP patients (23%, 8%) (P < 0.001). UIP had a larger fraction of the range of normal lung. The density histogram was less skewed (P = 0.01) and had a wider peak (P = 0.02) in NSIP (skewness = 1.2879 ± 0.5672, kurtosis = 1.2115 ± 1.9470) than in UIP (skewness = 1.6426 ± 0.4664, kurtosis = 2.3880 ± 1.8183). CONCLUSION:: The density histogram reflected the differences in the CT features between NSIP and UIP. Therefore, a density histogram may be helpful for differentiating NSIP from UIP without definite honeycombing.
Physiology Is a Stronger Predictor of Survival than Pathology in Fibrotic Interstitial Pneumonia
Jegal, Yangjin,Kim, Dong Soon,Shim, Tae Sun,Lim, Chae-Man,Do Lee, Sang,Koh, Younsuck,Kim, Woo Sung,Kim, Won Dong,Lee, Jin Seong,Travis, William D.,Kitaichi, Masanori,Colby, Thomas V. American Thoracic Society 2005 American journal of respiratory and critical care Vol.171 No.6
<P>The histopathologic pattern provides the most important prognostic marker for idiopathic interstitial pneumonia; however, studies have suggested that short-term changes in lung function may be more important. We investigated the prognostic factors for fibrotic interstitial pneumonia. The clinical features and follow-up course of 179 patients (131 with idiopathic pulmonary fibrosis and 48 with nonspecific interstitial pneumonia; 41 fibrotic types and 7 cellular) were analyzed retrospectively. The lung function indices improved or stabilized in most patients with fibrotic nonspecific interstitial pneumonia in contrast to the deterioration or stable condition of most patients with idiopathic pulmonary fibrosis. The 5-year survival of patients with fibrotic nonspecific interstitial pneumonia (76.2%) was better than for those with idiopathic pulmonary fibrosis (43.8%) (p = 0.007). Multivariate analysis at the time of presentation revealed that pathologic pattern, age, and diffusion capacity had important prognostic implications. However, after 6 months of follow-up, changes in FVC, initial diffusion capacity, and sex were the only independent prognostic factors, with no additional prognostic information conferred by the histologic diagnosis. Our data confirmed the importance of physiological parameters including short-term change in FVC. However, at the time of diagnosis, histopathology was important for the prediction of prognosis and future change in lung function.</P>