Hyperkalemia can occur in all the following except-
The enhanced mineralocoicoid effect in Cushing syndrome is caused by occupation of the MR by the high concentration of coisol. Hypokalemia and metabolic alkalosis are more common in Cushing syndrome caused by ectopic ACTH production (90%) than in other causes of Cushing syndrome (10%) Ref Davidson 23rd edition pg 364
Cushing syndrome
Crush injuries
Renal failure
Intravascular haemolysis
Fluid and electrolytes