frontal antrum的用法和樣例：
例句
- Frontal osteomyelitis induced by sinusitis is the most frequent clinical presentation.
額竇炎導致額骨骨髓炎通常會破壞額骨及額竇的結構，這是臨床上常見的現象。 - Frontal sinus mucocele invading the orbit via a traumatic fistula was verified by operative finding and histopathological study.
經手術后，始發現為一由額竇經過先前的槍傷洞孔而伸入左眼眼窩的粘液囊腫。
