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5) Finally, Maillard and Kountakis reported the case of a 2 1/2-year-old boy with desmoid fibromatosis that involved the left antrum and ethmoid air cells and eroded the orbital floor.
CT identified it as an expansile soft-tissue lesion that was occupying the roof of the nasal cavity with destruction of the cribriform plate and extension into the ethmoid air cells bilaterally.
This condition was associated with a bone defect in the posterior ethmoid air cells, which appeared to be the origin of the CSF fistula (figure 2).
The base of the middle turbinate can be invaded by ethmoid air cells, which can enlarge the turbinate; an enlarged turbinate is known as a concha bullosa.
Magnetic resonance imaging (MRI) of the nose and paranasal sinuses provided confirmation that the soft-tissue mass involved the left ethmoid air cells and extended across the midline to the right side and that it also involved the frontal sinuses, primarily on the left (figure 2).