 [ Symptoms ] i suffer from olfactory hallucination phantosmia for over 20yrs [ Disease ] hi frontal lobe lesion is unrelated to your problem on the other hand lesion to your uncus can cause phantosmia i recommend checking you sinus gland also try to recall how it first started was it after sever flu or nose bleed did you have chest problems scaring to your sinus can cause your problem good luck