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Brain Tumors/Brain cyst and blood brain barrier



I am wondering if a large posterior fossa arachnoid cyst is capable of compromising, even destroying the blood brain barrier.  Ever since I was diagnosed with this cyst, there have been many things I cannot take, that cause severe reactions, where years ago, I used to could take them.  I have been told that since my cyst is so large, taking up over 1/3 of my brain, that it has destroyed or compromises my BBB.  I have to be very careful with medications because I will have severe reactions from them, when years ago, before the cyst became a problem, I had no issues.  Would you agree that a large cyst could upset the BBB?

I am a tumor (cancer) doctor not a neurologist. Your question should be directed to a neurologist! Good luck!

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Brain Tumors

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Claes-Gustaf Nordquist, M.D.


I`m a doctor of medicine and specialist in radiation therapy and medical oncology. I have a long time experience of these tumours.


I'm a Doctor of Medicine and specialist in Medical Oncology and Radiation Therapy, educated and trained in Sweden. Now retired. Background in Radiation Therapy, Medical Oncology, Radiation Protection, Nuclear Medicine, Diagnostic Radiology, Gynecological Oncology, Clinical Pathology, Clinical Cytology,Hematology and Internal Medicine. M.D. from the faculty of medicine, Royal Karolinska Institute, Stockholm, Sweden. Have also been an exchange student at the Hebrew University, Hadassah Medical School, Jerusalem Israel. Former medical consultant, Swedish National Board of Radiation Protection. Former Police Surgeon and Medical Examiner, Stockholm Police Department. Former Chief Medical Officer, The Royal Guards, The Royal Horse Guards and the Royal Household Brigade, Royal Swedish Army Medical Corps. You can also reach me on: . I have no restrictions on the number of questions there. I also answer questions about Oncology (General Cancer), General History, Military History, Breast Cancer, Colon Cancer.

Doctor of medicine, specialist in medical oncology & radiation therapy.

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