Hrct corads 2 means. Some other thing?

Hi done hrct to rule out covid ...it shows corads 2...what does it mean? Symptoms-severe upper back pain(just back of breast)when ever sit or do work ..relief when resting on bed...left breast and shoulder blade pain(on and off pain),feeing on numbness in the above mentioned areas,throat itching and shortness of breath ocaasionally...this is since Aug .took hrct in aug...showed corads 2-minimal plueral effusion and infective etiology...doctors told nothing to worry about it.cbp crp nt pro bnp serum creatinine serum uric acid thyroid vit b12 calcium eeg normal ...vit d3 16 and esr 28...took vit d3 supplements weekly once for 3 months.took azee bilagra salt water gargle betadine doxcyp Montek lc lexzin mk medrol 16 mg pregabalin nt ,for all symptoms..getting cold chills during winter and also shortness of breath in ac.so plz tell us corads 2 serious?are these related to lungs or some other thing?27f