Virtual Library
Start Your Search
K. Kato
Author of
-
+
P2.08 - Poster Session/ Thymoma, Mesothelioma and Other Thoracic Malignancies (ID 225)
- Event: WCLC 2015
- Type: Poster
- Track: Thymoma, Mesothelioma and Other Thoracic Malignancies
- Presentations: 1
- Moderators:
- Coordinates: 9/08/2015, 09:30 - 17:00, Exhibit Hall (Hall B+C)
-
+
P2.08-024 - CT Findings of Early Pleural Mesothelioma and Benign Asbestos Pleural Effusion (ID 272)
09:30 - 09:30 | Author(s): K. Kato
- Abstract
Background:
• Malignant pleural mesothelioma is known as disease of the poor prognoses. • Our purpose is to find useful CT findings for correct differentiation between Malignant Pleural Mesothelioma in the early stage (e-MPM) and Benign Asbestos Pleural Effusion (BAPE) to improve prognosis of MPM.
Methods:
• The BAPE group consisted of 36 patients diagnosed at Okayama Rosai Hospital since Jan 2000. In all BAPE patients thoracoscopic biopsies were conducted to exclude malignant diseases including MPM. • In e-MPM group, 66 patients who were diagnosed mesotheliomas with T1 or T2 (IMIG system) by the CT evaluation were studied. The e-MPM patients were selected from 2,742 mesothelioma death cases of Japanese vital statistics of 2003-05. • We evaluated CT scans taken at the time of diagnosis for each group. The evaluating items were presence of asbestosis, pleural plaque (PQ), rounded atelectasis (RA) and diffuse pleural thickening (DPT), as well as the grade and localization of pleural irregularities.
Results:
• In BAPE group (36 cases), the occurrence rate of asbestos-related lesions was significantly higher than in e-MPM group (66 cases) as follows; prevalence of asbestosis 17%/2% (*), PQ 92%/35% (**), RA 44%/0% (**) and DPT 25%/2% (**). (*P=0.0038 **P<0.001) • As for grade of pleural irregularity, no irregularity was found in 22%/9%, low-level irregularity in 72%/54%, high-level irregularity in 5%/23% and mass formation in 0%/14% of BAPE and e-MPM group patients, respectively. • As for localization (including overlap) of pleural irregularity, irregularity in mediastinal pleura was observed in 30%/74%, basal pleura in 91%/77% and interlobar pleura in 0%/55% of BAPE and e-MPM group patients, respectively. The mediastinal pleural thickening was minimal in BAPE group and found regressed in the follow-up CT scans.
Conclusion:
• In BAPE group the occurrence rate of asbestos-related lesions was higher than in e-MPM group. • Because the 5% of BAPE cases presented irregular pleural thickening, the differentiation with MPM was difficult in such case. • The mediastinal pleural thickening, which is considered to be a characteristic of MPM, was also observed in 30% of BAPE cases. However, the finding disappeared during observation. And no BAPE case with interlobar pleural irregularity was found. These findings can be useful for differentiation BAPE and e-MPM cases.
