Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Ostium
Introduction
Overview
Overview
An ostium is a small opening or orifice, as in a body organ or passage.
Anatomy
Anatomy
- 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
Ostial Disease
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
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]