Fig. 12From: Head and neck imaging manifestations in COVID-19: collective experience of 17 months during 2nd wave of the pandemicPathway of spread in invasive rhinosinusitis; PNS: paranasal sinus, SPF: sphenopalatine foramen, PPF: pterygopalatine fossa, CS: cavernous sinus, PMF: pterygomaxillary fissureBack to article page