Using (18)F-FDG PET/CT to rule out Richter transformation as cause of deterioration in a patient with chronic lymphatic leukemia and severe COVID-19: A case report

RATIONALE: This case report demonstrates the use of flourine-18 fluorodeoxyglucose ((18)F-FDG) positron emission tomography (PET)/computed tomography (CT) to rule out Richter transformation (RT) as the cause of clinical deterioration in a patient with chronic lymphatic leukemia (CLL) and severe COVID-19. (18)F-FDG PET/CT can be used to establish the diagnosis of RT in patients with CLL, but the use of (18)F-FDG PET/CT to exclude RT as the cause of clinical deterioration in patients with CLL and severe COVID-19 has not previously been described. PATIENT CONCERNS: A 61-year-old male with CLL and COVID-19 developed increased dyspnea, malaise and fever during hospitalization for treatment of severe and prolonged COVID-19. DIAGNOSES: (18)F-FDG PET/CT ruled out RT and revealed progression of opacities in both lungs consistent with exacerbation of severe acute respiratory syndrome coronavirus 2 pneumonia. INTERVENTIONS: (18)F-FDG PET/CT imaging. OUTCOMES: The patient was discharged at day 52 without the need of supplemental oxygen, with normalized infection marks and continued care for CLL with venetoclax. LESSONS: (18)F-FDG PET/CT ruled out RT as the cause of deteriorations in a patient with CLL and severe COVID-19, enabling directed care of exacerbation of severe acute respiratory syndrome coronavirus 2 pneumonia.