Is it possible to group by multiple columns in a CASE statement? I get error "Incorrect syntax near ','." in below code...

```
SELECT
  CASE 
     WHEN Type = 'Test'
       THEN Description
     ELSE MAX([Description])                
  END AS 'Description'
GROUP BY
CASE
    WHEN Type = 'Test'
        THEN Description
    ELSE ''
END,
Type, Account, Structure    

```