"memorable case" is grammatically correct and can be used in written English.
You can use it when you want to describe a case or situation that is particularly noteworthy or stands out in your memory. Example: The lawyer's closing argument in that memorable case was so persuasive that the jury deliberated for only an hour before reaching a verdict.
Manufacturing plants with rusty tools, mold in production areas and — in one memorable case — a barrel of urine.
Mr. Lucas followed, and the rest is, if not quite the stuff of history, a memorable case of chutzpah.
The 2012 elections were competitive and uncertain (one memorable case saw something close to a punch-up), particularly over congressional seats.
The first part of this problem, the fact that the state takes the big risks, is exemplified by a memorable case study of Apple.
In one memorable case, a group of residents were thrown out by the fire brigade due to apparent breaches of fire safety.
Atwood has characters here who are close to death, dead already, unwittingly doomed or – in one memorable case – freeze-dried; but her own curiosity, enthusiasm and sheer storytelling panache remain alive and kicking.
Except for rare but memorable cases of "intentional mischief," Scoresby observed, a whale does not fight back.
The authors asked a number of psychiatrists to describe their most memorable cases; and some that had stuck in their memory tended to be of Freudian duration.
One of her more memorable cases involves a man who spent a decade crossing into the U.S. repeatedly to reunite with his family.
In one of the most memorable cases, a wrecking ball destroyed a corner tower of the former Paterson Silks store near Union Square on March 8 , 2005
In one of his most memorable cases, late last year a 35-year-old man poisoned another man he had a grudge with.
