• Title/Summary/Keyword: Diagnostic usefulness

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Diagnostic Usefulness of FDG-PET in Cervical Metastasis of Squamous Cell Carcinoma of the Head and Neck (두경부 편평세포암종의 경부 전이에 대한 F-18 FDG PET의 진단적 유용성)

  • Kim Chan-Jong;Kim Jae-Seung;Kang Woo-Seuk;Nam Soon-Yuhl;Choi Seung-Ho;Kim Sang-Yoon
    • Korean Journal of Head & Neck Oncology
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    • v.19 no.2
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    • pp.142-147
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    • 2003
  • Purpose: Accurate evaluation of metastatic cervical lymph nodes plays a decisive role in the treatment and prognosis of patients with squamous cell carcinoma of the head and neck. The purpose of this study is to investigate the usefulness of FDG-PET for diagnosis of cervical metastasis in the head and neck cancer by comparing with the conventional imaging study. Materials and Methods: The subjects on this study were 30 patients (24 males and 6 females, aged 39 to 76, mean 57.1) diagnosed as pathologic-proven squamous cell carcinomas of the head and neck. All patients underwent preoperative FDG-PET, CT(n=27) or MRI (n=3). Their medical records were reviewed retrospectively. Using pathologic reports as a golden standard, the results of FDG-PET were compared with conventional imaging study (CT/MRI) in the evaluation of cervical metastasis. Results: Thirty patients had five different primary sites which were tongue (11), supraglottis (10), glottis (6), hypopharynx (2) and tonsil (1). A total of 40 neck dissections were performed unilaterally in 20 patients and bilaterally in 10 patients. Of these, 16 showed pathologically positive for lymph node metastasis. The sensitivity and specificity of FDG-PET for the diagnosis of cervical metastasis was 75% and 100% respectively, compared with conventional imaging of 56.3% and 95.8%, respectively. The difference of sensitivity was not statistically significant (p=0.453). Of 5 cases with small metastatic node (<1cm), 3 were detected on PET detected correctly but none were detected by CT. Conclusion: FDG-PET was more accurate than conventional imaging study in the diagnosis of metastatic lymph nodes in squamous cell carcinomas of the head and neck, especially detection of small metastatic node. FDG-PET might be useful adjunct to conventional image in the preoperative evaluation of head and neck squamous cell carcinoma.

Prestenotic Bronchial Radioaerosol Deposition: A New Lung Scan Sign of Bronchial Obstruction (기관지 협착 근위부의 연무 침착: 폐스캔에서 기관지 폐색의 특이한 지표)

  • Chung, Soo-Kyo;Kim, Hak-Hee;Choi, Byung-Gil;Lee, Sang-Hoon;Kang, Si-Won;Bahk, Yong-Whee
    • The Korean Journal of Nuclear Medicine
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    • v.29 no.3
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    • pp.307-312
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    • 1995
  • The present study has been carried out to assess the diagnostic usefulness of radioaerosol lung scan in complete bronchial obstruction (n=7) and bronchial narrowing (n=1) of varying causes. $^{99m}Tc$-phytate lung scan was performed using the aerosol generated by a BARC nebulizer. Scan alterations were correlated with those of chest radiography, bronchography, lung CT and/or brochoscopy. In every case scan showed characteristic intense deposition of radioaerosol in a short slightly dilated, bronchial segment immediately proximal to obstruction or stenosis. Characteristically it was accompanied by an airspace aerosol deposition defect distally. The finding of a short, clubbed, bronchial radioaerosol deposition with distal airspace defect is a sensitive, specific indicator of bronchial obstruction or stenosis. It was especially useful in the detection of the obstruction of a small bronchus at the lobar and sublobar levels. We propose to name it the prestenotic aerosol deposition sign.

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Usefulness of Vibration Response Imaging (VRI) for Pneumonia Patients (폐렴환자에서 진동 공명 영상 검사(VRI)의 유용성)

  • Park, Eu-Gene;Park, Jung-Hee;Hong, Mi-Jin;Kim, Won-Dong;Lee, Kye-Young;Kim, Sun-Jong;Kim, Hee-Joung;Ha, Kyoung-Won;Chon, Gyu-Rak;Kim, Hyun-Ai;Yoo, Kwang-Ha
    • Tuberculosis and Respiratory Diseases
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    • v.71 no.1
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    • pp.30-36
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    • 2011
  • Background: Pneumonia is commonly seen in outpatient clinics. it is widely known as the most common cause of death from infectious disease. Pneumonia has been diagnosed by its typical symptoms, chest X-ray and blood tests. However, both chest X-rays and blood tests have limitations in diagnosis. Thus primary care clinicians usually have been constrained due to a lack of adequate diagnostic tools. Vibration response imaging (VRI) is a newly emerging diagnostic modality, and its procedure is non-invasive, radiation-free, and easy to handle. This study was designed to evaluate the diagnostic usefulness of the VRI test among pneumonia patients and to consider its correlation with other conventional tests such as Chest X-ray, laboratory tests and clinical symptoms. Methods: VRI was performed in 46 patients diagnosed with pneumonia in Konkuk University Medical Center. VRI was assessed in a private and quiet room twice: before and after the treatment. Sensors for VRI were placed on a patient's back at regular intervals; they detected pulmonary vibration energy produced when respiration occurred and presented as specific images. Any modifications either in chest X-ray, C-reactive protein (CRP), white blood cell count (WBC) or body temperature were compared with changes in VRI image during a given time course. Results: VRI, chest X-ray and CRP scores were significantly improved after treatment. Correlation between VRI and other tests was not clearly indicated among all patients. But relatively severe pneumonia patients showed correlations between VRI and chest X-ray, as well as between VRI and CRP. Conclusion: This study demonstrates that VRI can be safely applied to patients with pneumonia.

Identification of Mycobacterium tuberculosis in Pleural Effusion by Polymerase Chain Reaction(PCR) (흉막 삼출액에서 중합효소 연쇄반응(PCR)을 이용한 M. tuberculosis의 검출)

  • Kim, Sun-Taec;Gang, Chang Woon
    • Tuberculosis and Respiratory Diseases
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    • v.42 no.5
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    • pp.695-702
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    • 1995
  • Background: Since polymerase chain reaction(PCR) was devised by Saiki in 1985, it has been used extensively in various fields of molecular biology. Clinically, PCR is especially useful in situation when microbiological or serological diagnosis is limited by scanty amount of causative agents. Thus, PCR can provide rapid and sensitive way of detecting M. tuberculosis in tuberculosis pleurisy which is diagnosed in only about 60 % of cases by conventional method. Method: To evaluate the diagnostic usefulness of PCR in tuberculosis pleurisy, The results of PCR was compared with those of conventional method, including pleural biopsy. The pleural effusion fluid was collected from 7 proven patients, 7 clinically suspected patients and control group(7 patients with malignant effusion). We extracted DNA from pleural fluid by modified method of Eisennach method(1991). The amplification target for PCR was 123 base pair DNA, a part of IS6110. Result: 1) Sensitivity of PCR: We detected upto 50fg DNA. 2) In patients with pleural effusion of proven tuberculosis, the positive rate of PCR was 85.7%(6/7). In patients with pleural effusion of clinically suspected tuberculosis, the positive rate was 71.5%(5/7). In control group, positive rate was 0%(0/7). Conclusion: We concluded that PCR method could be a very rapid, sensitive and specific one for diagnosis of M tuberculosis in pleural effusion. Further studies should be followed for the development of easier method.

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Sacroiliac Joint/Sacrum Uptake Ratio Measured by Quantitative Sacroiliac Joint Scintigraphy (골(骨)스캔을 이용(利用)한 천장관절(薦腸關節)/천골섭취비(薦骨攝取比)의 정량적(定量的) 측정(測定))

  • Lee, Young-Yiul;Park, Seon-Yang;Lee, Myung-Chul;Choi, Sung-Jae;Cho, Bo-Youn;Choe, Kang-Won;Koh, Chang-Soon
    • The Korean Journal of Nuclear Medicine
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    • v.16 no.2
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    • pp.63-70
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    • 1982
  • To evaluate the diagnostic usefulness and significance of quantitative sacroiliac joint scintigraphy in the assessment of sacroiliitis, we measured Sacroiliac Joint/Sacrum Uptake Ratio(SIS Ratio) by region of interest(ROI) method using $^{99m}Tc-methylene$ diphosphonate. The observed results were as follows: 1. Using ROI method, the SIS ratios for the control group of 65 persons were $1.05{\pm}0.08$(left) and $1.06{\pm}0.07$(right) which were narrower in range than those of slice method $(mean{\pm}S.D.)$. 2. The effects of age, gender and laterality on SIS ratio were not significant. 3. In left side, one of 6 patients with rheumatoid arthritis had SIS ratio in excess of 2 standard deviation of normal control group, and remainder had SIS ratios within normal limit. In right side, 3 patients had SIS ratios in excess of 2 standard deviation of normal control group, and remainder, within normal limit. 4. In both sacroiliac joint, 2 of 3 patients having sacroiliitis clinically with Reiter's syndrome whose pelvis A-P X-ray findings showed normal had high SIS ratios (left/right; 1.31/1.69, 1.90/1.80), but SIS ratio of one patient who had no evidence of sacroiliitis clinically was within normal limit. 5. In 6 patients with ankylosing spondylitis in both sacroiliac joints, 4 whose pelvis A-P Xray findings showed severe sclerotic change of sacroiliac joints had SIS ratio within normal limit or below that of normal control group, and SIS ratios of 2 patients whose pelvis A-P X-ray findings showed were increased. 6. 4 of 5 patients with low back pain of which cause could not be evaluated clinically and radiologically had SIS ratios in excess of that of normal control group. It would be concluded that quantitative sacroiliac joint scintigraphy is useful and sensitive screening method in the diagnosis as well as in the assessment clinical activity of sacroiliitis.

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Efficacy of Fine Needle Aspiration Biopsy in Parotid Gland Tumors (이하선 종양에서 세침흡인검사의 유용성)

  • Lee, Chang-Hee;Lee, Hyun-Sub;Jin, Sung-Min;Lee, Sang-Hyuk;Pyo, Jung-Soo;Sohn, Jin-Hee
    • Korean Journal of Head & Neck Oncology
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    • v.27 no.2
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    • pp.204-209
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    • 2011
  • Background and Objectives : The usefulness of fine needle aspiration biopsy(FNAB) for diagnosis of parotid gland tumors is controversial, because of the generalized belief requiring surgery for most parotid tumors. The aim of this study was to evaluate the efficacy of FNAB for diagnosis in parotid gland tumors. Material and Methods : FNAB was performed in 91 patients who underwent parotid surgery at Kangbuk Samsung Hospital from January 2007 to December 2010. The result of FNAB, 11 malignancies and 75 benign tumors and 5 non-neoplasms were analyzed and compared with the final histopathologic diagnoses. Sensitivity, specificity, accuracy, positive predictive value(PPV), and negative predictive value(NPV) were calculated using final histopathologic diagnosis of the surgical specimen as the standard diagnostic reference for comparative analysis. Results : 86 specimens(94.5%) were suitable for evaluation. We compared the result of FNAB and the final histopathology in 79(89.4%) cases. The sensitivity, specificity, accuracy, PPV, and NPV of FNAB for detecting pleomorphic adenoma was 95.8%, 88.4%, 92.3%, 90.2%, and 95.0%. In Warthin's tumor, results were 86.4%, 94.2%, 92.3%, 82.6%, and 95.6%. Among 11 patients who were diagnosed with malignancy on final histopathologic report, only 3(30%) patients were diagnosed with the same as on FNAB, the other 8 patients were initially diagnosed incorrectly as benign tumors in FNAB. There were no complications related to FNAB. Conclusion : Diagnostic accuracy for FNAB in benign parotid tumors was high. However, in malignant tumors, FNAB shows low diagnostic usefulness compared with benign tumors. FNAB can be effective and safe diagnostic technique for evaluating the benign parotid glands tumors.

Trace Elements Deficiency and the Diagnostic Usefulness of Hair Mineral Analysis in Children with Chronic Gastrointestinal Disease (만성 소화기 질환 환아에서 미량원소 결핍과 모발 검사의 유용성)

  • Hong, Jea-Na;Lee, Jung-Hwa;Lee, Ran;Shin, Jee-Youn;Ko, Jae-Sung;Seo, Jeong-Kee
    • Pediatric Gastroenterology, Hepatology & Nutrition
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    • v.11 no.2
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    • pp.122-129
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    • 2008
  • Purpose: Patients with chronic gastrointestinal disease are at risk for trace element deficiency due to impaired absorption and gastrointestinal loss. The aim of this study was to evaluate the trace element status of patients with gastrointestinal disease by blood and hair analysis, and to determine the usefulness of hair mineral analysis for diagnosing trace element deficiency not detected by a blood test. Methods: An analysis of hair minerals was performed and compared with blood mineral analysis in 13 patients with chronic gastrointestinal disease. The concentration of each element in the hair and blood was compared in the subgroups based on parenteral nutritional support or clinical symptoms. Results: Almost all patients had trace element deficiency. The trace elements deficient in the blood or hair analysis included zinc, selenium and copper. The hair zinc concentration was significantly lower in the group receiving parenteral nutritional support. The hair selenium concentration was statistically associated with the clinical symptoms of hair loss, brittle hair and loss of hair pigmentation. Conclusion: The results of this study suggest that patients with chronic gastrointestinal disease should receive adequate zinc and selenium replacement to avoid trace element deficiency especially when treated with long-term parenteral nutrition. Hair mineral analysis is useful as a complementary tool for the detection of a trace element deficiency.

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Radioaerosol Scan Manifestations of Diffuse Panbronchiolitis (미만성 세기관지염의 연무흡입 폐환기스캔 소견)

  • Kim, Hak-Hee;Choi, Byung-Gil;Bahk, Yong-Whee;Chung, Soo-Kyo;Park, Seog-Hee;Shin, Kyung-Sub;Park, Sung-Hak
    • The Korean Journal of Nuclear Medicine
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    • v.28 no.2
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    • pp.192-199
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    • 1994
  • Diffuse pahbronchiolitis(DPB) is a relatively new, chronic, nonspecific, inflammatory disease of the lung that typically involves the airways in the "transitional" zone of the lung. Clinically, DPB strongly resembles chronic obstructive pulmonary disease (COPD) and the distinction between the two is crucial because the former is often fatal, requiring different therapeutic strategies. This study was prospectively carried out to assess diagnostic usefulness of radioaerosol scan(RAS) in DPB. RAS findings were analyzed with respect to the location and extent of abnormal aerosol deposition in the lung divided into the central, intermediary, and transitional airways and the peripheral airspaces. RAS showed mottled aerosol deposits characteristically in the transitional and intermediary airways with peripheral airspace defects. Such a deposition pattern contrasted sharply with central aerosol deposition of COPD. In conclusion, RAS appears to be a convenient, noninvasive, and useful diagnostic method of DPB.

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Diagnostic Usefulness of Computed Tomography Compared to Conventional Chest X-Ray for Chest Trauma Patients (흉부 외상 환자에서 일반흉부촬영과 비교한 흉부단층촬영의 진단적 유용성)

  • Choi, Kyu Ill;Seo, Kang Suk;Ryoo, Hyun Wook;Park, Jung Bae;Chung, Jae Myung;Ahn, Jae Yoon;Kang, Seong Won;Yi, Jae Hyuck
    • Journal of Trauma and Injury
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    • v.22 no.2
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    • pp.142-147
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    • 2009
  • Purpose: Early diagnosis and management of therapeutic interventions are very important in chest trauma. Conventional chest X-rays (CXR) and computed tomography (CT) are the diagnostic tools that can be quickly implemented for chest trauma patients in the emergency department. In this study, the usefulness of the CT as a diagnostic measurement was examined by analyzing the ability to detect thoracic injuries in trauma patients who had visited the emergency department and undergone CXR and CT. Methods: This study involved 84 patients who had visited the emergency department due to chest trauma and who had undergone both CXR and CT during their diagnostic process. The patients' characteristics and early vital signs were examined through a retrospective analysis of their medical records, and the CXR and the CT saved in the Picture Archiving Communication System (PACS) were examined by a radiologist and an emergency physician to verify whether or not a lesion was present. Results: Pneumothoraxes, hemothoraxes, pneumomediastina, pulmonary lacerations, rib fractures, vertebral fractures, chest wall contusions, and subcutaneous emphysema were prevalently found in a statistically meaningful way (p<0.05) on the CT. Even though their statistical significance couldn' be verified, other disorders, including aortic injury, were more prevalently found by CT than by CXR. Conclusion: CT implemented for chest trauma patients visiting the emergency department allowed disorders that couldn' be found on CXR to be verified, which helped us to could accurately evaluate patients.

The Utility of Scalene Lymph Node Biopsy in the Diagnosis of Sarcoidosis (유육종증 진단에서의 사각근 림프절 생검의 유용성)

  • Chung, Won-Sang;Kim, Young-Hak;Song, Young-Joo;Kim, Ji-Hoon;Kim, Hyuck
    • Journal of Chest Surgery
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    • v.43 no.6
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    • pp.694-699
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    • 2010
  • Background: In addition to clinical and radiographic findings, a histopathologic examination is important in the diagnosis of sarcoidosis. This study evaluated the diagnostic usefulness of a scalene node biopsy in patients with suspected sarcoidosis. Material and Method: We studied 35 patients who underwent scalene node biopsy because of suspicion of sarcoidosis on a chest x-ray and a computerized tomogram between 2001 and 2009, regardless of symptoms. Result We studied 15 men and 20 women whose mean age was $41.51{\pm}11.21$ years (25~64). Three among the 35 were diagnosed with tuberculosis and 27 with sarcoidosis, resulting in a diagnostic yield of 84.4%. The mean lymph node diameter size was 1.3 (${\pm}0.12$) (0.3~3.6 cm) cm. We divided the group of participants according to stage - whether on chest x-ray the lung was affected or not (stage 0, 1 and stage 2, 3). We divided lymph node sizes as well - whether they were larger than 1 cm or smaller than 1 cm. For these subgroups, there were no significant differences in diagnostic yield (p=0.604) (p=0.084). There were no complications or mortality. Conclusion: Scalene node biopsies are simply done under local anesthesia, without major complications. They have a high diagnostic yield regardless of the stages of the disease and lymph node size. We conclude that scalene node biopsy is a good alternative to other biopsy methods in sarcoidosis.