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Pineal Tumor vs Pineal Cyst
I would really, very greatly appreciate, even short and simple answers to these two questions:

1. What is the difference between a pineal tumor (e.g. pineocytoma etc.) and a pineal cyst? Not literally. Figuratively;

I have read information that states that it is not possible to distinguish between the two on imaging studies alone, and that "....pineocytoma(s) can mimic pineal cysts". I don't understand how if you have a mass composed of one cell type vs. a mass composed of another cell type makes a difference? Especially where mass effect is concerned. It makes since to me in the form of a simplistic analogy: One water balloon is filled with water, one with kool-aid. If they are black balloons (e.g. ambiguous imaging studies), how would you know the difference? I don't know if that makes sense to anyone else or just seems ridiculous.

AND

2. What measurements constitute a "large" cyst in the professional medical community? How large is considered large enough to merit suspicion/attention/options for treatment?

Thank you so much for your time and consideration.
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657231 tn?1453836403
1. They do show up differently in imaging. Something that is fluid filled looks different than a solid mass.

2. It seems to be more symptom driven. But then again, some doctors are just... well, do not listen well.
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I have been told by the pituitary specialist that the tumor on mine has to be 3mm to be consider an option for treatment and that 7mm (from the pituitary) is just 1m from the optic nerve.
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That's interesting to hear. Mine is 9mm and I am the one who had to even bring it to my doctors attention!  I'm sure this is the cause of all my health issues, but I am having difficulty finding a good neurologist that will even listen to me.  Very frustrating!
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Neurologists may be very quick to tell you that you are fine with a pineal cyst and that it is not causing your symptoms.  But beware:  1) Doctors in general don't really understand what the pineal gland does; and 2) Some don't seem to understand the difference between symptomatic and asymptomatic pineal glands and tell their patients not to worry about pineal cysts.

Some things to keep in mind, according to the medical literature:

1) The most common symptom is headaches, followed by vision problems and dizziness, and in some cases insomnia, nausea and cognitive deficits, particularly if cognitive deficits are involved.  More rare is numbness and tingling.  In extreme cases, pineal cysts can result in loss of consciousness and seizure disorder.  So please take this seriously, particularly if the cyst is causing intracranial pressure such as hydrocephalus.
2) Pineal cysts can be symptomatic if they are larger than 0.5 cm.  Problems occur when the cysts cause compression in the brain, or when they are associated with apoplexy or hydrocephalus.
3) Radiologists cannot easily distinguish between cysts and benign tumors, often leading to misdiagnosis.  NOTE:  A benign tumor is not metastatic, not malignant.  It is extremely, extremely rare to get a malignant, metastatic tumor in the pineal gland, so please do not worry about this unless your radiologist/doctor has told you otherwise.
4) It is common that patients are told that the pineal cyst cannot be affecting them after a neurological test.  But note that some patients present no neurological symptoms in these tests, while still having the symptoms in 1) above.
5) If you are in the 18-34 age group, your cyst can grow, so you should get MRIs every 3-6 months.  If your doctor does not want to, get a new doctor.
5) If you have to get surgery, get the following one but only if you have compression or hydrocephalus and your symptoms are incapacitating:  Suboccipital craniotomt with infratentorial-supracerebellar approach and microsurgical resection of pineal cyst.  Contrary to what is stated above, this is NOT brain surgery.  They access your pineal region from beneath the brain, so they do not affect your brain at all.  It sounds like a scary procedure but is actually straightforward for a good brain neurosurgeon.  The surgeon essentially inserts a microscopic endoscope that magnifies the area by 50x and uses a navigation system to get him there.  It is minimally invasive.  The medical literature says that most patients whose pineal cysts are not too large (e.g., < 4.5 cm) become completely asymptomatic after surgery.  The surgery entails a 6-8 week recovery, and a small incision in the head and removal of skull bone, which grows back after surgery.  The biggest risk associated with surgery is infection, as with any other surgery.

The most important thing is to get a doctor who takes your pineal cyst seriously.  It is a rare disorder, and few doctors understand it well.  So you will need to be persistent.

Good luck.
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Does anyone know a neurosurgeon in Houston?
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657231 tn?1453836403
Under *Experts* in the blue banner - there is a pull down menu and in there you can select find a doctor. As well, in the health pages in the very bottom of the column on the right, there are resources for brain and pituitary tumors - if you are looking to remove a smallish tumor (which I think you are if you are in this thread) then an endoscope is appropriate and so asking someone who routinely does pituitary surgeries is fine - they have that equipment and skill. Many of the sites list the surgeons by location. Good luck!
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Yes - one of the best in the world for pineal brain cysts is in Houston; Dr. Dong Kim at Memorial Hermann.  I had a 17mm (very large!) pineal brain cyst and he removed it this past February.  Pressure, headaches, symptoms greatly improved.  He is an extremely kind and attentive MD, who I would highly recommend.  I also have an "arachnoid cyst" which is causing neck pain, but despite that, I am so THANKFUL for finding DR. DONG KIM.
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My grandson is 4 and we go to the neuro dr wednesday. We dont know how big it is and we are very nervous and scared.
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...In regard to my previous post and the size of the pineal cyst.  I just referenced one my MRI reports (4 brain MRI's over the course of ~2 years of monitoring) and exact dimensions from that time were 1.6 x 0.9 x 1.0 CM
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