The phrase "an internal case" is correct and usable in written English.
It can be used in contexts where you are referring to a situation, issue, or example that is contained within an organization or system.
Example: "The team is currently reviewing an internal case that highlights the challenges we face in our workflow."
Alternatives: "a domestic issue" or "an in-house matter".
Therefore, we undertook an internal, case-control study by pooling publicly available NIOSH reports of individual on-duty CHD firefighting fatalities to elucidate job-related precipitants as well as underlying medical risk factors.
Evidence that was to be introduced in the case included an internal Shell memo where the head of Shell Nigeria offered to intervene on Saro-Wiwa's behalf, if only Saro-Wiwa and others would stop claiming that Shell had made payments to the military.
Officine Panerai looked to its Submersible 1950, first designed for the Egyptian Navy, to inspire its Luminor Submersible 1950 Amagnetic 3 Days Automatic Titanio, a new model with an outer case in brushed titanium and a second internal case made of soft iron that ensures a high degree of resistance to magnetic fields.
This may be an inherent limitation of internal case reviews when carried out in district hospitals with few physicians involved in emergency obstetric care; possibly the involvement of a higher level, e.g. the obstetrician from the regional referral hospital, could help, but one would have to look out for any threatening or intimidating effect this may have on the audit team.
The crew's union, Unite, said BA was "joining the 21st century" by making the change, a decision made after an internal test case.
A troubled detective, Will Dormer, goes to Alaska to wrap up a simple murder case but, groggy from the perpetual daylight, accidentally shoots his partner, who was due to testify against him in an internal affairs case.
But on the female side, you get internal cases as well as serious psychological ones.
Many institutions have guidelines as to how to proceed in such internal cases.
In 1942, during the early part of the war, Sherwood was ranked as an "Internal Security — C" case.
