text: CT imaging is essential in establishing a diagnosis of malignant necrotizing<unk>  externa by revealing the extent of infection past the ear canal and extension to adjacent tissues.
option_0: Otitis externa CT
option_1: Otitis externa physical examination
option_2: Dacryoadenitis CT
option_3: Otitis media CT or MRI
option_4: Appendicitis CT
option_5: Q fever CT
option_6: Appendicitis MRI
option_7: Appendicitis ultrasound