Ostium

An ostium is a small opening or orifice, as in a body organ or passage.

• Ostium of Fallopian tube.
• Ostium primum or foramen ovale (ostium secundum) of the developing heart.
• Ostium maxillare of the Maxillary Sinus
• Ostium of uterus
• Ostium vaginae (vaginal orifice)
• Coronary ostium (Opening of coronary arteries at root of aorta, superior to aortic valve)

Ostial disease refer to diseases involving the ostium of a body organ, passage or vessel. In particular, ostial stenosis is a narrowing in a ostium. It can refer to:

• Coronary ostial stenosis
• Renal ostial stenosis

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