I'm not an expert, but from what I've read, some possible causes of dizziness and fluid in the forehead after a tumor removal from the right front lobe may include:
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Post-operative complications: Depending on the type of surgery performed, there can be several post-operative complications that can occur, including dizziness and fluid accumulation in the forehead.
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Infection: Infection can occur after any surgical procedure and can cause dizziness and fluid accumulation in the forehead.
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Recurrence of the tumor: Although rare, it is possible for a tumor to recur after surgery.
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Other neurological conditions: Dizziness can be a symptom of other neurological conditions such as vertigo or Meniere's disease.
Have you done any tests to try determining what is happening?