<prompt> Retraction ball is seen after injury to:LiverSpleenBrainKidney  <response>: Ans: C Brain Concussion of Brain: Microscopic examination does not show axonal injuries up to 12 hours after injury. After 12 hours, the axons first appear dilated, then club-shaped and finally appear as round balls known as 41retraction balls, which indicates transected axons. The number of retraction balls begins to decrease 2 to 3weeks after injury, and clusters of microglial cells appear, followed by astrocytosis and demyelinisation- Reddy 27th223Periventricular Leucomalacia Manual of Neonatal Care by John P. Cloheny 6th514 Found predominantly in preterm infant Characteristic neuropathology: bE areas of focal necrosis, gliosis disruption of axons with the so called retraction clubs balls 