This does not seem likely, a brain tumor is an uncontrolled cell growth usually caused by gene abnormalities.
Source(s):
http://www.uabhealth.org/14040/
http://en.wikipedia.org/wiki/Brain_tumor

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First of all the injury would have to be severe enough to have caused brain injury, probably one that would have had severe damage, not just head trauma.

check out this link.

http://www.jstor.org/pss/3554116
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No. You could suffer from other ailments as a result of a trauma, such as a bleed, but bumps do not cause tumors.

Brain tumors, or a tumor anywhere in the body, are a mass of tissue and cells that grows at an abnormal rate. The cells are not like other cells - they resist the bodies attempts to break down the mass, and don't respond to the bodies normal mechanisms. If you think of how your body reacts after you hit your head - the area may swell, because the bodies natural reaction is to rush to the aid of the injured part, so the blood will rush their causing a bruise. The tissue will grow, or become inflamed, to protect itself. The inflammation after hitting your head is normal, and part of the healing process. The difference between that bump and a tumor is that the body has a shut off mechanism to stop the healing process of the bruising and swelling, it does not have a shut off for a tumor.

If we knew what caused them, a lot of people would be cancer free!
Source(s):
Medical training!

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Traumatic Brain Injury (TBI) occurs more often than you would think, and there are any number of scenarios that can cause it. Some of the more obvious include severe auto accidents. For instance, a passenger may be thrown through the windshield and hit their head on the pavement. Another common example could be an elderly person slipping in the shower and banging their head on the way down. However, we tend to forget that a football player can sustain a brain injury during a tackle that is just as devastating as one caused by a car crash. Here, we have outlined the key conditions responsible for TBI and the circumstances that produce them.

Since there are so many variations of TBI, it can be expected that each diagnosis is linked to a unique set of symptoms. But, obviously a mild brain injury is not going to exhibit all of the side effects that a severe brain injury would, and some of those linked to severe TBI would be of much more serious nature. This list is a good point of reference to help you determine the severity of a head injury.
Source(s):
http://www.traumatic-braininjury.com/nontraumatic/brain_tumor.html

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