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radiology ppt ct chest ct lung anatomy carcinoma lung ct thorax hrct lung congenital hrct mri retroperitoneum parathyroid brain physics usg thorax ct radiology resident x ray interventional radiology radiology contrast intervention radiology physics renal kidney mediastinum patterns masses cotrast media thyroid radio opaque contrast reactions brain cisterns basal cisterns barium swallow appendicitis basic matter interaction high osmolar contrast fleischner socitey guidelines nodule solitory pulmonary nodule spn contrast media images ivu intravenous ureterogram head to toe whole system rsna power point pre sacral sacral congnital pet ct presacral space sacrum dd differwntial differential biopsy fnac mrcp ercp intervention radiology anomaly pancreas develepmental osteonecrosis obstetrics gynecology osteomyelitis resident architecture signs radio xray radiology signs thorax chest x ray sarcoidosis pulmonary sarcoidosis neuro sarcoidosis abdominal sarcoidosis neuro abdomen bone sarcoidosis ophthal optic manifestations