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Dear Dr. Roach: Could you give some additional information about H. pylori infection? I was diagnosed with it recently, via biopsies taken during an endoscopic procedure.

Dear Dr. Roach: Is it possible for X-rays and a CT scan to miss advanced lung cancer? My brother worked two days before he died. He went to the hospital, was admitted to hospice and died the next day.

Dear Dr. Roach: I am in my mid-50s and in good health (I don鈥檛 take any medications). I rarely get sick with colds or flu. I have been vaccinated with all the common vaccinations for childhood.

Inappropriate sinus tachycardia most often seen in women in their 30s

Dear Dr. Roach: I have been following all the concerns about exposure to measles, but have not seen anything mentioned that it is dangerous for pregnant women to be exposed.

Dear Dr. Roach: My girlfriend has necrobiosis lipoidica. She suffers from this on her shins, as did her mother. She is not diabetic. We cannot find good information on how to rid her of this.

Dear Dr. Roach: I am a 66-year-old woman. I had a hysterectomy and removal of one ovary. For the past six months, I have had brown vaginal discharge. Should I be concerned? L.M.

Dear Dr. Roach: I have Parkinson鈥檚 disease and balance is an issue. I have been using a cane on the right side, my weak leg side. I have seen videos that say a cane should be used on a person鈥檚 uninjured side.

Dear Dr. Roach: Can you shed light on how vestibular migraines are diagnosed and the best treatment? J.H.

Dear Dr. Roach: We are very fond of our family doctor. I was in to see him the other day, and it came up in conversation that he was going to be getting married this summer.