RT Journal Article SR Electronic T1 Significance and long-term outcome of nonspecific pleuritis after medical thoracoscopy JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP P3363 VO 40 IS Suppl 56 A1 Xanthi Tsiafaki A1 Maria Chorti A1 Niki Maounis A1 Maria Kokolaki A1 Constantinos Mantzouranis A1 Vasiliki Filaditaki YR 2012 UL http://erj.ersjournals.com/content/40/Suppl_56/P3363.abstract AB Introduction: A specific diagnosis of an exudative pleural effusion (EPE) often poses a clinical challenge for the pulmonary physician. Although medical thoracoscopy (MTH) remains the gold standard technique in the work up of patients with EPE a definite histological diagnosis will not be established in a significant number of the cases and will therefore be, characterized as non specific pleuritis (NSP). Objective: To study the outcome of patients with NSP in a group of patients with long term follow up. Method: A retrospective analysis was performed on 110 patients who underwent thoracoscopy for EPE, over a 7 year period, at our Institution. In 47(42,7%) cases, that were histologically diagnosed as NSP, long-term follow up (a minimum of 24 months) was available. MTH was performed by a respiratory physician, experienced in the procedure, under local anesthesia and IV/IM sedation.Results: A definite histological diagnosis was established in 63 patients. In the remaining 47 (42.7%), 35 men and 12 women with mean age of 64.5 years, the diagnosis of NSP was rendered. Four of the latter (8.5%) were subsequently diagnosed with malignancy after an interval of 3-5 months (2 mesotheliomas, 2 adenocarcinoma). A probable cause was established on clinical grounds in 13(27.6%) cases. Finally, in 30 (63.8%) patients, the underlying etiology for NSP was not discovered and was therefore, described as “idiopathic pleuritis”.Conclusions: In our series 3.6% proved to be false negative, after a mean follow up of 4 months. Furthermore, in 27.3% of our undiagnosed EPE cases, a definite diagnosis could not be determined and was characterized as “idiopathic pleuritis”.