COVID-19 and Adenovirus Multi-Lobar Pneumonia on CT Scan in a Patient with Repeatedly Normal Chest X-Rays Despite Severe Hypoxia and the Need for Non-Invasive Ventilation.

The British Society of Thoracic Imaging (BSTI) has published clear guidance on the classification of chest X-ray (CXR) findings in coronavirus disease 2019 (COVID-19) patients, which are summarised in four main categories: COVID-classical, COVID-indeterminate, COVID-normal, or non-COVID. We report the case of a 34-year-old lady who is otherwise fit and well. She presented with typical COVID-19 symptoms requiring supplemental oxygen, with normal CXR and COVID-19 reverse transcriptase-polymerase chain reaction (RT-PCR) swab on admission. Her condition deteriorated after 24 hours with severe hypoxia requiring up to 60% oxygen. Repeat CXR was normal, which was followed by computed tomography pulmonary angiogram (CTPA) that ruled out pulmonary embolism; however, CTPA confirmed multi-lobar pneumonia consistent with COVID-19. The patient was admitted to the intensive care unit for non-invasive ventilation (NIV) and ongoing care. Extended respiratory screening confirmed positive COVID-19 antibodies and positive adenovirus swabs. The patient also developed COVID-19 related hepatocellular injury and myocarditis in the absence of other causes. These were treated by a multidisciplinary team, and the patient achieved full recovery after three weeks. This case highlights the fact that normal CXR does not rule out COVID-19 pneumonia even in the severely hypoxic patient requiring NIV. Also, it is important to investigate for other potential causes of hypoxia in a deteriorating patient, such as pulmonary embolism and non-COVID causes of pneumonia.