CASE PRESENTATION: 71 year old lady with known SLE presented with productive cough,dyspnea and 10 pounds unintentional weight loss. Her examination showed oxygen saturation of 92% on room air, bibasilar fine crackles, loud P2 and trace bipedal edema. CT chest showed right hilar lesion measuring 6.4 x 3.4 cm encasing right pulmonary vasculature with resulting post-obstructive pneumonia. CT also showed bibasilar bronchiectasis, cystic changes and septal thickening suggestive of SLE associated ILD. Echocardiogram showed estimated Pulmonary Artery Systolic Pressure of 100mm Hg and moderate pericardial effusion. CT angiogram ruled out pulmonary embolism. CT angiogram further delineated right pulmonary artery from the mass. Interestingly, 3-D reconstruction showed extension of pericardial fluid into right pulmonic recess of transverse pericardial sinus encasing the right pulmonary artery all the way to right inferior pulmonary artery. Attenuation values were noted to be 20 Hounsfield Units (HU) in the perivascular space and 18 HU in pericardial effusion, both confirming fluid consistency. Patient was started on oral steroids and subsequent imaging showed near resolution of pericardial effusion and hilar lesion.