ostium


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Related to ostium: Ostium primum, Ostium secundum

ostium

[′äs·tē·əm]
(biology)
A mouth, entrance, or aperture.
References in periodicals archive ?
This report presents the case of an ostio-choanal polyp originating in the maxillary sinus ostium mucosa.
To validate mapping, a circular decapolar catheter (Lasso, Biosense Webster) placed around the PV ostium was used.
Defects in the fontanel area of the lateral nasal wall observed in both axial and coronal PNsCT images were interpreted as an accessory ostium. An accessory ostium is rounder than the natural ostium and the size ranges from 1.2x1.0 to 8.2x6.9 mm (11).
An unusual lateral ostium of a concha bullosa of the middle turbinate.
The length and distance of origin from the ostium of parent artery were measured with the help of a measuring scale.
In this study, single ostium was the most frequent findings (78%), double ostia were seen in 20 hearts (20%), three ostia were seen in two cases (2%) at anterior aortic sinus (Figure 1).
The objective of our study was to analyze the arterial origin, branching pattern, location ostium, vertebral level of origin, mediastinal trajectory, and diameter of the bronchial arteries using CTA.
We report an unusual manifestation of sinus of Valsalva aneurysm involving the ostium of the right coronary artery producing an appearance typical of a giant coronary aneurysm.
For type A coronary malperfusion, the coronary ostium was repaired with a continuous 6-0 over-and-over suture conjoining the dissected arterial layers, leaving the ostium in continuity with the aortic wall or directly anastomosing the ostial button to the tube graft.
(1,2) The 2 mm P waves in lead [V.sub.2] indicate right atrial enlargement, (3) helping to confirm right ventricular enlargement and to suggest a fossa-ovalis type (ostium secundum) atrial septal defect.
Nasal mucosa and medial wall of the sac was removed up to the extent that the cut margins of the sac were approximated with the margins of the nasal mucosa around the margins of bony ostium. Bone and medial wall of the sac was removed inferiorly up to the upper part of nasolacrimal duct to prevent sump syndrome.
All patients with isolated atrial septal defect (ostium secundum, ostium primum and sinus venosus with or without partial anomalous pulmonary venous connection) were included.