not sure if this is a diagnosis and not simply a general term that merely describes Cassano's symptoms.
If reports are to be believed, tests have shown it wasn't a stroke but they needed further testing to figure out what caused all this. These tests are expected to be done by the end of the day.
Milan's doctor said yesterday that Cassano's situation wasn't overly serious, but delicate - possibly referring to not being a stroke - but that was without them knowing the actual cause of the player's illness ... who knows, they might end up backtracking on those initial reports, once all tests have been completed.
latest reports suggest he is back to normal functioning but there is still no final diagnosis of his illness, afaik.