A little girl is running through the toy store when she slips on the floor and falls, landing on her arm. She begins crying immediately. When she is checked, there is no evidence of external bleeding. Which injuries might she have sustained?

A contusion is a bruise caused by impact and can occur without any external bleeding. A fall onto her arm could also fracture an arm bone, even if the skin is unbroken. A laceration is a cut or tear in the skin, so it would involve an external wound and is not supported by the description.

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