A Rare Case of Anti-glycyl transfer RNA (tRNA) Synthetase Antibody-Related Non-specific Interstitial Pneumonia

This is a case of a 65-year-old female with a past medical history of type 2 diabetes mellitus (DM) and hypothyroidism who presented with a five-day history of shortness of breath, dry cough, and fatigue. Shortness of breath was exertional, and cough was intermittent. She had no exposure to COVID-19 infection. During the presentation, the patient required supplemental oxygen up to 6 liters per minute (L/m) and was tachypneic and tachycardic. Initial computed tomography (CT) of the chest revealed bilateral parenchymal disease compatible with COVID-19 pneumonia, however, the patient's COVID-19 polymerase chain reaction (PCR) test was persistently negative. Despite being treated for COVID-19 pneumonia, the patients’ oxygen requirement increased, leading to the requirement of non-invasive positive pressure ventilation (BiPAP - bilevel positive airway pressure). The pulmonologist initiated a workup for possible underlying interstitial lung disease (ILD). Anti-glycyl transfer RNA (anti-EJ) antibody was positive on two occasions. The patient was started on pulse dose steroid and long-term steroid taper. The patient responded very well to the steroid and was later able to wean off the oxygen to room air. High-resolution CT which was done 3 months after the hospital stay revealed features suggestive of non-specific interstitial pneumonia (NSIP). Anti-synthetase syndrome is a rare but treatable etiology of ILD and should always be considered as a differential during workups.