Subsequently, the gravity and negative air pressure (Bernoulli's phenomenon) resulted in the extension of this polyp toward the choana
Caption: FIGURE 1: MRI T2-weighted axial (a) and sagittal (b) images depicting a left nasal mass arising from the roof of the nasal cavity and extending to the posterior choana
, with no intracranial extension seen.
A sphenochoanal polyp begins within the sphenoid sinus and extends through an enlarged sphenoid ostium into the sphenoethmoidal recess and from there into the choana
. The sphenochoanal polyp typically lies between the nasal septum and the middle turbinate (Figure 10); this space is clear with antrochoanal polyps.
Changes of brain--hydrocephalus; Changes of head and neck--esophageal atresia, absence of nasal septum, and choana
's hypoplasia; Cardiac changes--expansion of heart ventricle; Urogenital changes--hydronephrosis, renal agenesis and hermaphroditism.
The Nyctiphruretus-Procolophonoidea (K) clade has bootstrap support of 61% and a decay value of 2, and is diagnosed by the following synapomorphies: narial shelf present (1:1); ventral margin of postorbital skull emarginated (35:2); posterior margin of skull roof slightly concave with protruding medial postparietal(s) (38:3); pterygoid anterior extent posterior to choana
aparece en su superficie ventral localizada al extremo opuesto de la sutura con el palatino, hacia la zona occipital.
Description: Measurements in mm: SVL 32.7, head length 12.5, head width 12.0, eye diameter 4.6, snout length 5.5, internarial distance 2.9, naris-jaw distance 2.0, orbit-jaw distance 0.8, choana
width 1.2, tympanum diameter 2.3, interfascicular distance 0.0, tarsal length 9.2, hand length 11.0, arm length 6.7, tibia length 17.3, foot length 14.3, femur length 16.3, IOD 3.0, pad width of Finger III 2.0, pad width of Toe IV 1.8.
dcmc dorsal cavity of middle chamber, ccmc caudal cavity of middle chamber, in inner naris (choana
Dalmatian pelicans have greatly reduced external nares and poor apposition between the choana
In her endoscopic nasal examination, a polypoid structure, of which the pedicle originated in the lateral nasal wall on the left, extended to the nasopharynx and obstructed the choana
on both sides (Figure la, lb).
CECT (contrast-enhanced computed tomography) of the nose and paranasal sinuses (Figure 1) showed heterogeneously enhancing mass in the right nasal cavity, likely centered in middle turbinate with extension into the right ethmoid sinus superiorly and choana
and sphenoid sinus posteriorly with erosion of the adjacent bone.
(3) The middle turbinate helps differentiate between the antrochoanal and sphenochoanal polyps: The antrochoanal polyp is found between the middle turbinate and the lateral nasal wall, extending into the choana
; the sphenochoanal polyp is located between the middle turbinate and the nasal septum, extending into the choana