Thrombosis of the cerebral veins and sinuses ... Interpretation of the angiograms can be difficult because of anatomical variations such as a unilaterally hypoplastic or absent transverse sinus. 5.

The frontal sinuses show the most anatomic variation such as congenital absence or hypoplasia (Fig. 1). The sphenoid sinuses, located posteriorly, form last. Anatomy of Sinuses-Artist's Rendition.

Hypoplastic ethmoid sinuses are shown in pigs with cystic fibrosis. Panel D shows a chest CT image of a piglet with cystic fibrosis on the day of birth and before the development of airway ...