This composite educational graphic illustrates navigational landmarks and logic for Functional Endoscopic Sinus Surgery (FESS). Image (a) is a real-world clinical photograph captured during nasal endoscopy, showing a close-up view of the internal nasal anatomy. The image identifies the middle nasal concha (turbinate) and the middle nasal meatus, characterized by a healthy, reddish-orange mucosal surface with a moist, smooth texture. Image (b) is a clinical flowchart/algorithm detailing the spatial transitions between anatomical landmarks encountered during the procedure. The diagram uses a hierarchical structure to show connectivity between nodes such as the 'Outside', 'Nose Entry', 'Middle Nasal Meatus/Concha', 'Uncinate Process of Ethmoid', 'Ethmoidal Bulla', 'Maxillary Sinus Orifice', and 'Spheno-Ethmoidal Recess'. Red arrows define directional semantic relations, specifically 'spatially precedes' and 'spatially follows', which indicate the relative depth or inward/outward movement of the endoscope within the nasal cavity. This resource is designed to train surgical navigation prediction models by mapping visual anatomical landmarks to procedural pathways.

This clinical photograph displays a medical simulation setup for functional endoscopic sinus surgery (FESS), specifically demonstrating the reachability of a novel manipulator system within the lateral region of the frontal sinus. The image features a pink, semi-translucent anatomical phantom representing the human frontal sinus, including internal cavities and regions of varying density to simulate pathological tissue. A flexible surgical manipulator arm is inserted through the sinus floor (simulated Draf IIa window). At the distal end of the manipulator, a pair of metallic grasping forceps is shown in an actuated (closed) state within a lateral recess of the phantom. Blue text and a circular annotation highlight the 'actuated forceps,' indicating the stage of the procedure involving tissue manipulation or retrieval. The demonstration illustrates the surgical system's ability to navigate the complex, pyramid-shaped anatomy of the frontal sinus and access hard-to-reach lateral pathology through minimally invasive nasal access routes.

This composite intraoperative endoscopic clinical photograph illustrates a functional endoscopic sinus surgery (FESS). Image A displays the right sphenoid sinus cavity containing diffuse reddish-pink tissue, indicative of inflamed and swollen nasal mucosal polyps. A small area of whitish, denser material is visible among the irregular, vascularized tissue surfaces. Image B demonstrates a more advanced stage of the procedure, specifically showing the dehiscence of the sphenoid sinus roof. Centrally, a prominent, whitish, tubular structure is identified as the exposed optic nerve, which has become visible due to the erosion or removal of the overlying bone. The surgical field is highly vascularized with visible blood and fluid surrounding the exposed nerve and adjacent dural remnants. These images are clinically significant for demonstrating surgical management of Allergic Fungal Rhinosinusitis (AFRS) or similar inflammatory processes causing compressive optic neuropathy. The material serves as an educational resource for otorhinolaryngology and ophthalmology regarding sinus anatomy, surgical complications, and endoscopic landmarks.

This procedural clinical photograph displays an endoscopic view of the right nasal cavity during a functional endoscopic sinus surgery (FESS). The image was captured using a 4mm 45-degree rigid endoscope. Key anatomical landmarks are labeled: the lamina papyracea (LP) on the lateral wall, the middle turbinate (CM) medially, and the agger nasi cell (AN) superiorly. The agger nasi cell is positioned such that it obstructs the direct endonasal visualization of the frontal sinus ostium, demonstrating a common anatomical variant that complicates frontal recess access. A surgical instrument is visible in the foreground, positioned near the lamina papyracea, indicating active manipulation for dissection or clearance of the obstructive ethmoidal cells. This image serves as an educational tool for identifying paranasal sinus anatomy and understanding the surgical challenges posed by agger nasi pneumatization in managing frontal sinus drainage.

This clinical endoscopic image captures an intraoperative view during a functional endoscopic sinus surgery (FESS), specifically focusing on the right ethmoidal sinus. The visual field demonstrates an antero-posterior ethmoidectomy in progress. Several fractured ethmoidal septations are visible as irregular, whitish bony fragments. The surrounding sinonasal mucosa is notably congested, hyperemic, and edematous, exhibiting a deep red hue consistent with inflammatory changes and surgical trauma. Minimal hemorrhagic and potentially purulent fluid is interspersed among the tissues. In the lower right foreground, a metallic surgical instrument, likely a microdebrider or probe, is positioned to manipulate the bony septa. This image serves as an educational example of intranasal surgical anatomy, demonstrating the controlled breakdown of ethmoidal cells to improve sinus drainage in the context of inflammatory disease or secondary complications like empyema.

This diagnostic image is an intraoperative endoscopic view of the human nasal cavity during Functional Endoscopic Sinus Surgery (FESS). The visual field demonstrates the nasal septum and adjacent sinonasal mucosa, which exhibits a hyperemic, reddish-pink hue consistent with high vascularity or inflammatory response. Within the surgical field, thin metallic surgical instruments are visible, actively manipulating the tissue. There is evidence of dark red pooled blood and moist surfaces, characteristic of the intraoperative environment in sinus surgery. The image serves to illustrate the challenge of maintaining a clear surgical field in the presence of capillary bleeding and mucosal oozing. Key educational concepts include the visualization of endoscopic anatomy under surgical conditions and the importance of hemostasis for anatomical clarity during rhinological procedures.

This diagnostic image is a coronal computerized tomography (CT) scan of the paranasal sinuses in bone window. The image demonstrates the postoperative status of the sinonasal cavities following right-sided Functional Endoscopic Sinus Surgery (FESS). Key visual findings include a widely patent right ostiomeatal complex and a right maxillary antrostomy. The right maxillary and ethmoid sinuses are clear and well-aerated, characterized by a lack of opacification, fluid levels, or significant mucosal thickening. Surgical changes on the right side are further evidenced by the absence of the middle turbinate, consistent with a prior middle turbinectomy. In contrast, the left nasal cavity shows intact anatomy, including the left middle and inferior turbinates and a normally aerated left maxillary sinus. The nasal septum is midline, and the orbital structures and skull base appear intact. This image serves as an educational example of a successful surgical outcome in the management of chronic or infectious sinusitis, such as sinonasal actinomycosis, showing complete resolution of previous disease and restoration of normal sinus drainage pathways.

This diagnostic image is a coronal Computed Tomography (CT) scan of the paranasal sinuses and nasal cavity using a bone window setting. The view displays key sinonasal anatomy, including the maxillary sinuses, the ethmoid air cells, the nasal septum, and the inferior and middle nasal conchae (turbinates). The image specifically illustrates the morphometry of the ostiomeatal complex. An overlaid blue line measures the inclination of the uncinate process on the patient's right side. The measurement shows an angle of 51.9 degrees, calculated between a horizontal reference line originating from the superior edge of the uncinate process and its superior border. This anatomical assessment is clinically relevant for evaluating the patency of the infundibulum and planning functional endoscopic sinus surgery (FESS), as the uncinate process orientation can influence the drainage pathway of the anterior ethmoid and maxillary sinuses.

This diagnostic image set consists of four coronal low-dose CT (ldCT) scans of the paranasal sinuses, illustrating various anatomical variants and pathological findings relevant to Functional Endoscopic Sinus Surgery (FESS). Panel (a) shows bilateral complete maxillary sinus opacification and a left-sided infraorbital ethmoid cell (Haller cell) obstructing the ostiomeatal complex, with evidence of prior cranial surgery (arrowhead). Panel (b) highlights an ethmoid bulla and a Keros type II cribriform plate variant, indicating a moderate depth of the olfactory fossa. Panel (c) demonstrates a right-sided concha bullosa (pneumatized middle turbinate, marked 'x'), a deviated nasal septum to the left with a bony spur, and an opacified ethmoid bulla. Panel (d) illustrates a Keros type I cribriform plate (shallow olfactory fossa) and a small bony spur near the anterior ethmoid artery. These images serve as an educational comparison of sinonasal anatomy, highlighting variants like the Haller cell and concha bullosa that contribute to chronic rhinosinusitis and surgical risk.

This medical illustration depicts the endoscopic anatomy of the right nasal cavity lateral wall, specifically focusing on the ostiomeatal complex (OMC). The diagram uses a color-shaded style to differentiate key surgical landmarks. Centrally, the ethmoidal bulla (eb) is shown as a prominent pneumatized structure. Anterior to it lies the uncinate process (up), a thin, hook-like bone. The space between the uncinate process and the ethmoidal bulla, known as the semilunar hiatus, is indicated by a horizontal white arrow. Medially, the middle nasal concha (mnc), or middle turbinate, is visible. For surgical context, a curved white line is superimposed on the lateral aspect of the uncinate process to mark the approximate limit for an uncinectomy, a primary step in functional endoscopic sinus surgery (FESS) to access the ethmoidal infundibulum and maxillary ostium. This educational visual is designed to assist in identifying anatomical relationships necessary for safe navigation during paranasal sinus procedures.