B) Computed tomography images before treatment show heterogeneous hypersignal in the
ethmoid and left maxillary sinus (arrows).
In the etiopathogenesis, we think that this mucocele developed with obstruction of the frontal sinus ostium following trauma and led to bone damage by expanding towards the
ethmoid sinus, because there was a history of trauma two years previously.
A computed tomography (CT) scan showed a soft-tissue mass with contrast enhancement originating in the
ethmoid sinus and extending superolaterally to the left side and infiltrating through the floor and posterior table of frontal sinus.
They occur most frequently in frontal sinus followed by
ethmoid and maxillary sinuses.
The dorsal nasal turbinate was the longest and largest one and extended from dorsal part of
ethmoid crest to level of 3rd transverse ruga of hard palate.
In this study, the common anatomical variations found among the 360 CT scans evaluated were Pneumatized Agger nasi cells, Concha bullosa, Asymmetry ethmoidal roof, Haller cells, Asymmetry of
ethmoid fovea, Anterior ethmoidal artery canal, Paradoxical bending of middle turbinate, Suprabullar Cells, Infrabullar Cells, and Onodi cells.
Paranasal mucoceles are most commonly found in the frontal sinus, and are occasionally found in the
ethmoid and sphenoid sinuses.
The
ethmoid air cells are present at birth and continue to grow until late puberty or until they reach compact bone (Fig.
CT scans can provide much more detailed information about the anatomy and abnormalities of the paranasal sinuses than plain films4 especially pathologies within the sphenoid and
ethmoid sinuses5,6.
KEY WORDS: Metastatic Prostate Cancer,
Ethmoid Sinuses, Proptosis.
Frontal sinus was the most common primary site (62%), followed by
ethmoid sinus (24%).
Ethmoid cartilage partially exposed laterally to form facet for articulation with palatine.
