Which of the following is false regarding frontal sinusitis
Clinical features of frontal sinusitis:

A frontal headache: showing periodicity and tenderness. 
Oedema of upper eyelids with suffused conjunctiva and photophobia.
Nasal discharge: a vertical streak of mucopus is seen high up in the anterior part of middle meatus
 X-ray: opacity of affected sinus seen. Both Waters' and lateral views should be taken.
CT scan is preferred modality.