A number of conditions other than a viral URI predispose to the development of sinusitis.
Sinusitis may complicate aso tracheal intubation. This is also a potential risk associated with large nasogastric tubes.
Recurrent sinusitis (often affecting the posterior sinuses) is fairly common in patients with moderate to advanced HIV infection.
Sinusitis is a common bacterial infection in children with neonatal HIV infection.
Sinusitis may also be part of clinical syndromes such as Kartagener disease,
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