The phrase "a welcome case" is correct and usable in written English.
It can be used in contexts where you want to express that a particular situation or example is favorable or appreciated.
Example: "The recent study provided a welcome case for the effectiveness of the new treatment."
Alternatives: "a favorable example" or "a positive instance".
On his visits to Egypt, Libya and Tunisia, the Turkish leader, who leads the Islam-rooted Justice and Development Party, made a strong and very welcome case that Islam and democracy are compatible.
We will welcome Case and his partners in true New Orleans style with an entrepreneur event that he won't see anywhere in the world.
Elsewhere in the suit, he said that "if Dow genuinely seeks to avenge a purported wrong, the bank should be a welcome addition to the case".
Orbis's name, look, feel and menu are all the work of Nancy Caballes, 35, one of a seemingly endless procession of young chef-owners who are fanning out over the suburbs like an occupying army -- in this case a welcome one, liberating New Jersey from the shackles of overcooked pasta and bad marinara sauce.
A welcome new exhibit in the case for men occasionally being good people: Zach Galifianakis.
Her case provides a welcome reminder to all motorists to not blindly renew their breakdown policies without checking that the price quoted is competitive.
The case is a welcome distraction from Harry's own problems, as he's just learned his wife Ellen Susan Clarkk) is having an affair.
After a presentation by the student's defense advocate Nestor Guzman and a student prosecutor, the jury, comprised of six seniors, comes to a decision: the student has to write an apology letter to the school counselor, attend tutoring, and serve on the jury for the next youth court case -- a welcome alternative to a suspension for a student who had already racked up 43 absences this school year.
Survivorship in this case provides a welcome but extremely rare exception to the paradigm of rabies as inevitably lethal (24 ).
It also acts as a welcome break for audience in case of long presentation.
