Grade I renal contusion

Subcapsular hematoma (grade I) in a 40-year-old man who had sustained blunt abdominal trauma. Contrast-enhanced helical CT scan demonstrates a subcapsular fluid collection (dashed arrows) flattening the posterolateral contour of the left kidney. There is minimal cortical laceration (arrowhead). Note also the subcutaneous emphysema in the left side of the back (arrow). A chest tube had been inserted for a left pneumothorax (not shown).