Final answer:
STIR MRI sequences are used to evaluate various conditions by suppressing fat signal in the image. They are used for compression fractures, fluid such as CSF, and musculoskeletal contusions, but not for evaluating lesions with retro-orbital fat.
Step-by-step explanation:
The Short TAU Inversion Recovery (STIR) sequences in MRI are typically used for imaging where fat suppression is required to evaluate lesions or pathology. STIR is useful for the evaluation of compression fractures, fluid such as cerebrospinal fluid (CSF), and musculoskeletal contusions. However, it is not typically used for imaging lesions with retro-orbital fat, because suppression of the fat signal would obscure assessment of the lesions in this region where fat is a key contrast feature.