Paranasal sinuses Flashcards
chronic sinusitis
obstruction of normal drainage pathways; may be relieved by functional endoscopic sinus surgery (FESS)
anatomic variations important to endoscopic surgery
dehiscent lamina papyracea: medial bulging of orbit
dehiscent cribriform plate: inferior bulging of frontal lobe
Agger nasi cell
“nasal mound”: most anterior ethmoid air cell
may cause obstruction of frontal recess
Haller cell
ethmoid cell located inferior to orbit; may compromise maxillary ostium if large or inflamed
onodi cell
posterosuperior ethmoid air cell; directly inferomedial to optic nerve
concha bullosa
inferior bulbous portion of middle turbinate that is pneumatized
may cause septal deviation/narrowing of infundibulum
acute sinusitis
infection/inflammation of paranasal sinuses
air-fluid level is nonspecific
chronic sinusitis
inflammation of sinus mucosa for 12 consecutive weeks
complications of sinusitis
orbital: subperiosteal abscess, orbital cellulitis, opthalamic vein thrombosis
intracranial: cavernous sinus thrombosis, meningitis, abscess
bone: periostitis, osteomyelitis, Pott’s puffy tumo
Pott’s puffy tumor
osteomyelitis of frontal bone with subgaleal abscess
mucus retention cyst
obstruction of small mucosal serous or mucinous glands
chronic allergic fungal sinusitis
noninvasive disease caused by hypersensitivity to fungi; immunocompetent with hx of asthma
expanded, airless thin deossified walls; mixed attenuation; curvilnear high attenuation
acute invasive fungal sinusitis
aggressive infection in immunosuppressed patients
typically Aspergillus or Zygomycetes; may result in acute fulminant disease with aspergillus
early: nonspecific sinus mucosal thickening»_space; local invasion, bony destruction, intracranial/orbital extension
antrochoanal polyp
benign polyp from maxillary sinus into nasal cavity; widened ostium
may erode bone/extend into nasopharynx
needs to be resected
mucocele
expanded airless sinus from obstruction of sinus ostia
thinning of sinus walls
