A 6 Year Old Boy Presents To The Ed With His Father After A Side On Collision In A 4wd Vehicle Whilst In A Deawoo. The Boy Has A Resp Rate Of 40per Minute And Complains Of Sob, With Greater Resonance To Percussion Of The Left Lung Than The Right And Apparently Symmetrical Chest Expansion. His Bp Is 100/70. You Perform An Xray But Cannot Find Any Fractures, Despite Marked Sob. The Boy Then Begins To Cough Some Blood. Which Of The Following Are Possible Diagnoses And How Would You Order Them From Most To Least Likely? A) Flail Chest B) Single Rib Fracture C) Left Lung Pneumothorax D) Right Lung Contusion

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1. A 6 Year Old Boy Presents To The Ed With His Father After A Side On Collision In A 4wd Vehicle Whilst In A Deawoo. The Boy Has A Resp Rate Of 40per Minute And Complains Of Sob, With Greater Resonance To Percussion Of The Left Lung Than The Right And Apparently Symmetrical Chest Expansion. His Bp Is 100/70. You Perform An Xray But Cannot Find Any Fractures, Despite Marked Sob. The Boy Then Begins To Cough Some Blood. Which Of The Following Are Possible Diagnoses And How Would You Order Them From Most To Least Likely? A) Flail Chest B) Single Rib Fracture C) Left Lung Pneumothorax D) Right Lung Contusion