In an operating room in , two surgeons stand shoulder to shoulder in oversized 3D glasses, staring at a giant mass of pinks, purples and whites on a 50-inch TV screen.
Below the screen lies Hannah Deoul, covered head-to-toe in a blue sheet, except for her brain, which is open and exposed.
She is one of the first patients to be treated using a new kind of 3D surgical 'videomicroscope,' allowing neurosurgeon Dr David Langer and every member of his surgical team at Lenox Hill Hospital to see the tiny dark tangle of blood vessels he is about to remove - a 'cavernous malformation' - with perfect clarity. 
Hannah is only 25 and at the beginning of a promising career as a recruiter in Connecticut where she commutes from her New York City apartment.
A former athlete, Hannah had always been in perfect health until she suddenly had a seizure while she was at her office in February due to a cavernous malformation, a common abnormality that strikes one in about every 100 to 200 people and had probably been nestled in her brain for most of her life.
If the cavernous malformation that had leaked blood into her brain stayed where it was, Hannah would have to be on anti-seizure medication - which can interfere with her fertility - for the rest of her life. 
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Dr David Langer (right) and his surgical team at Lenox Hill Hospital in New York City wear 3D glasses to have a perfect view of Hannah Deoul's brain through the feed from a new 'videomicroscope' that displays the surgical site in unprecedented detail on a giant high definition screen as they operate to remove a cavernous malformation from the 25-year-old patient's brain
Hannah Deoul, 25 (left), lives in New York City but was at work as a recruiter in Connecticut when she had a seizure due to bleeding from a cavernous malformation in her brain. Neurosurgeon Dr David Langer operated to remove the benign formation at Lenox Hill Hospital in New York in April (right)
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Rather than being permanently medicated and led panel light 600x600 waiting for another seizure, Hannah elected to have brain surgery to get rid of the malformation last month. 
Though not as high-risk as some operations, such as those to remove a brain tumor, Hannah's surgery still requires an expert surgeon's deft eyes and hands to carefully cut through the protective layers around her brain and suction out the cavernous malformation without damaging healthy tissue. 
Hannah's cavernoma was located in the less crucial white matter of her brain, making her an excellent candidate for surgery - but any open-brain operation comes with risks. 
The operation was meant to be three hours long, but Hannah's sister Maddie, parents Joan and Evan, and boyfriend Michael Ford waited anxiously as the surgery stretched into a fourth hour.
In the operating theater, Dr Langer and his whole team used the new videomicroscope to see the intricate architecture of her brain in unprecedented detail - and color - cutting out a lot of the guess work all brain surgeries entail.
Being able to assure even more precision has another benefit: it makes for quicker recovery times.
Hannah exemplified that.

Two months after her seizure, and one week after Dr Langer opened her brain and cut out a piece of it, you would never guess that vibrant, joking Hannah - with hardly a scar to show - had just had a major surgery.
Held in place with circular metal skull clamp, the area of Hannah's head that Dr Langer operated on was smaller than his own hands.

Without the aid of the new technology, his fingers and instruments would almost entirely obscure the site 
Hannah and her boyfriend, Michael Ford (right of left) both live in New York City.

He, her mother, Joan, and sister, Maddie (right) were all by Hannah's side for her brain surgery and helped her as she recovered at the family's Florida home
HANNAH HAD ONE OF THE 'BEST' BRAIN PROBLEMS - BUT NOT TREATING IT WOULD LEAVE HER IN FEAR OF SEIZURES FOR LIFE
The cavernous malformation may well have been lying dormant in Hannah's right frontal lobe for her entire life without disturbing her.