<prompt> Investigation of choice for solitary pulmonary nodule -USGCT ScanMRIX-ray  <response>: Ans. is b i.e., CT ScanInvestigations of choice in respiratory systemDiseaseInvestigationo Intersitiai lung diseaseo BronchiectasisHRCTHRCT 1st choiceBronchography 2nd choiceo Pulmonary embolismCT with i.v. Contrast 1st choiceVQ scan 2nd choiceo Solitary pulmonary noduleo Calcificationo Pulmonary malignancyo Superior sulcus or pancoast tumorCT scanCT scanCT scan except in superior sulcus or pancoast tumorMRI 