SESSION TITLE: Medical Student/Resident Chest Infections Posters SESSION TYPE: Med Student/Res Case Rep Postr PRESENTED ON: October 18-21, 2020 INTRODUCTION: Preceding the advent of effective antimicrobial regimens, “collapse therapy” was the mainstay of treatment for tuberculosis. This therapy became obsolete after the discovery of potent multi-drug regimens in the 1950s. However, collapse therapy represents an important historical treatment that was lifesaving to many patients in the 1930s and 1940s. CASE PRESENTATION: A 97-year-old female presented to the emergency department with acute onset dyspnea, worsening over several days. She was tachycardic to 163 bpm. Physical examination revealed right hemithoracic basilar crackles and poor air movement over the entire left hemithorax. EKG revealed multi-focal atrial tachycardia. Troponins were negative, however pro-BNP was elevated at 2950 ng/L. Chest radiography revealed left hemithoracic mass-like opacification with calcific margins. Chest computed tomography confirmed a well-circumscribed, peripherally calcified left hemithoracic mass. Contents of the mass were heterogeneous with areas measuring -60 HU, suggestive of lipoid material. Right-sided pleural effusion was also noted. She disclosed that she had been diagnosed with tuberculosis in her twenties and spent 5 months in a sanatorium prior to undergoing surgery. She denied post-operative complications. Her dyspnea resolved with diuresis and rate control. She was discharged home in improved condition. DISCUSSION: Collapse therapy was thought to provide the lung with much-needed rest and promote healing. In reality, alterations in oxygen tension created an unfavorable environment for the obligate aerobe. Plomage thoracoplasty was a form of collapse therapy in which apicolysis was achieved through insertion of inert materials, called plombe, usually into the extrapleural space. Materials used included paraffin wax, lucite spheres, gauze, sponges and mineral or vegetable oil. Oleothorax refers specifically to plomage utilizing mineral or vegetable oil. The intra-operative mortality of this historic therapy was 10%. Successful sputum conversion rates ranged from 61-93%. Immediate complications included infection and failure to heal. Long term complications include fistulization with surrounding structures, erosion of major vessels and malignancy. Oil plombe was intended to be aspirated after sputum conversion, usually after 24 to 48 months. However, some patients were lost to follow up after release from sanatoriums. CONCLUSIONS: As patients who underwent collapse therapy continue to age, familiarity with these therapies will diminish. Importantly, extensively drug resistant (XDR) tuberculosis may herald the return of surgical treatment for tuberculosis. Thus, we encourage awareness of the historic treatments for tuberculosis and its future therapeutic potential. Reference #1: Murray JF, Schraufnagel DE, Hopewell PC. Treatment of Tuberculosis. A Historical Perspective. Annals of the American Thoracic Society. 2015;12(12):1749-1759. doi:10.1513/annalsats.201509-632ps. Reference #2: Weissberg D, Weissberg D. Late Complications of Collapse Therapy for Pulmonary Tuberculosis. Chest. 2001;120(3):847-851. doi:10.1378/chest.120.3.847. Reference #3: Kolkailah AA, Fugar S, Rey-Mendoza J, Campagnoli T, Fakhran S. Revisiting the evolution of tuberculosis therapy: historical reflections in the modern era. Oxford Medical Case Reports. 2018;2018(9). doi:10.1093/omcr/omy055. DISCLOSURES: No relevant relationships by Victoria Andarcia, source=Web Response No relevant relationships by Joe Harb, source=Web Response No relevant relationships by Joseph Henain, source=Web Response No relevant relationships by Anneka Hutton, source=Web Response No relevant relationships by Navneet Kaur, source=Web Response