Computed tomography scan showing medial fracture of the lamina papyracea
with intraconal fat stranding (red arrow).
Ethmoid bulla occupying a lower position than normal, whereby the outer wall of the lowest cell is formed by the orbital wall of the superior maxilla instead of the lamina papyracea
The infection can spread directly through the thin lamina papyracea
into the orbits.
(6,16,17) The most common radiologic finding on CT was bony defect of lamina papyracea
and/or medial superior orbital rim.
Ethmoid Bulla occupying a lower position than normal, whereby the outer wall of the lower cell is formed by the orbital wall of the superior maxilla instead of the lamina papyracea
9): Infraorbital ethmoid cells are pneumatized ethmoid air cells that project along the medial roof of the maxillary sinus and the most inferior portion of the lamina papyracea
, below the ethmoid bulla and lateral to the uncinate process.
Computed tomography (CT) demonstrated a left frontoethmoid mass with evidence of bone erosion at the skull base and lamina papyracea
(figure 1, A).
Anatomically, frontal recess is bounded medially by the middle turbinate and laterally by the lamina papyracea
. (2) The posterior wall of the frontal recess is the bulla lamella.
Computed tomography (CT) demonstrated a soft-tissue mass that extended from the nasal cavity to the maxillary and ethmoid sinuses and eroded the lamina papyracea
; a bony defect was seen in the floor of the left nasal cavity (figure 2).
Orbital extension takes place through erosion of lamina papyracea
A comparison of the patient's most recent computed tomography (CT) scans with previous studies revealed the presence of a slowly growing mass with diffuse enhancement of the right anterior ethmoid complex and with erosion through the lamina papyracea
and opacification of the frontal sinus (figure 1).
CT scan of Head and PNS showed 6 x 5cm sized, soft tissue density, heterogeneously enhancing mass, occupying left ethmoid sinus extending in to the frontal sinus, with destruction of lamina papyracea
and cribriform plate on both sides with intra-orbital and intracranial extension.