<prompt> Which of the following is false regarding frontal sinusitisPain shows periodicityMost common sinus involved in infants and childrenPain is referred to as office headacheTenderness is present just above the medial canthus of eye  <response>: 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. 