FRI042 Worsening Shortness Of Breath After A Mild Case Of Covid-19

Disclosure: K. Qureshi: None. T.S. Krause: None. K. Vidlock: None. This case demonstrates a complication of COVID 19 that may be more common than we know and overlooked. A 34-year-old female presents to the Emergency Department with worsening shortness of breath and tachycardia for 3 days. Her symptoms are worse with ambulation. She feels dizzy and lightheaded. The patient had COVID-19 about two weeks ago and received monoclonal antibodies. The patient has a history of “drenching” night sweats and unintentional weight loss. She denies fever and cough. The patient is eating and drinking normally with no abdominal pain, nausea, or rash. No changes in bowel movements. The patient’s past medical history consists of ADHD, Anxiety, Neuropathy, and Insomnia. The patient takes Adderall, amitriptyline (ELAVIL), fluocinonide (LIDEX). The patient’s family history consists of an aunt who has autoimmune disease and a maternal grandfather who has Non-Hodgkin's Lymphoma. She works as a medical assistant in a family medicine clinic. Patient underwent a CTA which displayed a new anterior mediastinal mass measuring 4.6 x 2.6 x 3.2 cm which was not shown on a previous CT scan 11 months prior. She was referred to a thoracic surgeon for mediastinoscopy, which couldn’t be performed due to location not adjacent to trachea. A PET scan showed mildly FDG-avid soft tissue density in the anterior mediastinum. Four months later, the patient had a CT scan which showed a modest decrease in size measuring 2.1 x 2.5 cm. The thymus is important in maturation of T cells and is replaced with fat through aging. The thymus plays an important immunological role in defending against pathogens and cancer by maturing and releasing T cells. Thymic hyperplasia is a response that has been displayed in autoimmune diseases such as Myasthenia Gravis. Thymic rebound hyperplasia is seen more often in children, typically after chemotherapy treatment but not seen in adults. Rebound hyperplasia occurs less often with viral illness. There have been a limited number of cases seen with COVID-19. An observational study of 87 participants suggested that rebound thymic hyperplasia may be a positive predictive factor due to the benefit of T-cell lymphocyte production. The presence of thymic hyperplasia on CT scan in COVID patients correlated with a better prognosis in a retrospective study of 325 COVID patients that had a CT scan. This patient will require repeated imaging and follow up. The long-term consequences of this finding are unknown and this patient has a history of night sweats which preceded the COVID course. Presentation: Friday, June 16, 2023