The phrase "a startling case" is correct and usable in written English.
You can use it when describing a situation or example that is surprising or shocking in nature.
Example: "The investigation revealed a startling case of fraud that had gone unnoticed for years."
Alternatives: "an astonishing example" or "a shocking instance."
But on the whole, it was a startling case of deja vu, all over again.
The damage to the lives of thousands of children in Cambodia is a startling case study for Myanmar.
In 1995 Donald Foster, a professor of English at Vassar College, made a startling case for Shakespeare's being the author of an obscure 578-line poem called "A Funeral Elegy".
A startling case in Japan has confirmed that pregnant women with cancer can pass the disease to their fetuses.
But the difference in margins between the two business makes a startling case for redressing the balance: the Sugars Europe, in the former is at about 3.3% and Sucralose, in the latter, is 47.4%.
Although most such organisms multiply at healthy rates, the newly discovered microbes divide just once each year, on average--a startling case of "life on the edge," says team leader John Priscu, a microbial ecologist at Montana State University in Bozeman.
The case of anti-vaccination is a startling example of a case where it's not corruption that is doing the harm but a perception of corruption.
One startling case shows a KKK supporter pulling a knife on several black youths before being forced at gunpoint by a police officer to lie on the ground.
The most startling case is that of a marvelous landscape painted by the great Salomon van Ruysdael, signed and dated 1629.
In one startling case, two children on a domestic Air France flight in February were unable to reach their oxygen masks that deployed when the plane abruptly lost cabin pressure.
This startling case of "chemistry at a distance," as one scientist calls it, suggests that long-range DNA repair of some kind might play a role in normal cells.
