The ethmoid refers to a bone or a sinus. The mucoperiosteum is the lining of that bone and sinus. Minimal ethmoid mucoperiosteal disease means there's a little bit of chronic sinusitis in that sinus.

Surgery may be needed to clean out and widen the ethmoid sinus opening.

parietal bone

Ethmoidectomy is the medical term meaning surgical removal of part of the ethmoid bone or of tissues in the ethmoid sinus.

The maxillae contain the maxillary sinuses, the ethmoid and sphenoid contain the ethmoid and sphenoid sinuses, respectively.

****Maxilla is a facial bone, the three cranial bones that contain sinuses are ethmoid, sphenoid and frontal.