The phrase "astonishing case" is correct and usable in written English.
It can be used to describe a situation or example that is surprising or remarkable in some way.
Example: "The astonishing case of the missing artifact captivated the entire community and sparked a nationwide investigation."
Alternatives: "remarkable instance" or "incredible example".
The astonishing case captured the imagination of the Continent.
Turkish officials have slowly released details in the astonishing case of alleged Saudi state-sponsored murder.
In August, 2003, the scandal prompted the central government to abolish the system, an astonishing case of the Chinese press influencing national policy.
And in one astonishing case in Germany, a couple was beheaded as they drove upon a wire stretched across a road in protest.
And in May 2010, in a story on student loan debt, The New York Times reported an astonishing case of a recent graduate of NYU with nearly $100,000 in student loan debt from her four years at NYU (May 28, 2010; "Placing the Blame as Students are Buried in Debt").
In 2003, one of the Southern Group's editors, Cheng Yizhong, dared to publish an investigation into the death of Sun Zhigang, a young graphic designer who died in police custody after a beating — a report that led to the discovery and closure of a nationwide network of seven hundred underground police-run detention camps — an astonishing case of the Chinese press influencing national policy.
And yet, there have been some astonishing cases of attempting to bribe local government officials across the state — looking for advantages in a new system that's still coming into its own.
What is particularly astonishing about the case of Kendrec McDade, however, is the continued efforts made by Pasadena police to ensure a report into their actions by the Office of Independent Review (OIR), a civilian oversight group, remains hidden from the public gaze.
It is astonishing, for example, that none of the essays takes on the environmentalist case against unrestrained growth.
Among them was the law offices of David J. Stern, in Plantation, Fla., which was handling an astonishing 75,000 foreclosure cases a year — more than 200 a day.
In an astonishing 64% of cases, family and friends were aware of the individual's intent to engage in a terrorism-related activity because the offender verbally told them.
