1000316151.png
Can you explain what's happening in this diagram?
analyse_media
Reading File
Finding Sources
Searching the Web
endoscopic transnasal transsphenoidal approach pituitary diagram nasal endoscope
This diagram illustrates the endoscopic transnasal (transsphenoidal) approach to the skull base/pituitary region - a minimally invasive surgical technique used to access the sphenoid sinus and pituitary gland through the nose.
What's shown
Left side (patient's face, profile view): A patient's head is shown from the side, with a rigid endoscope (the thin blue instrument with an eyepiece/camera coupling at its handle) inserted through the nostril. The endoscope has a light source and camera cable attached, allowing the surgeon to view the internal anatomy on a monitor in real time.
Right side (cross-sectional anatomy of the nose and skull base): This is a cutaway view showing the internal structures the endoscope travels through and toward:
- The nasal cavity (the passage the scope travels through)
- The sphenoid sinus - the air-filled cavity behind the nasal passages
- The pituitary gland/sella turcica region - shown as the darker, rounded structure at the back (this is the usual surgical target, e.g., for removing a pituitary tumor)
- The oval pale structure above it likely represents the sphenoid sinus cavity or optic nerve/chiasm region, both of which lie close to the pituitary
The pink/maroon instrument entering from the right (from the mouth/oral side): This represents a second instrument (often a suction device, dissector, or drill) introduced either through the same nostril alongside the endoscope, or via a complementary trajectory, to perform the actual tissue removal or tumor resection while the surgeon views the field through the endoscope.
The gloved hand with a finger pointing/pressing near the base of the nose: This depicts the surgeon stabilizing or guiding the instrument, or possibly indicating the surgical trajectory/landmark used for orientation (a common step in endonasal approaches).
Clinical context
This is a classic depiction of endoscopic endonasal transsphenoidal surgery, most commonly performed to remove pituitary adenomas, but also used for other skull base lesions (craniopharyngiomas, Rathke cleft cysts, CSF leak repair). Key features of the real procedure that match the diagram:
- The endoscope is passed through one or both nostrils without any external skin incision.
- It travels along the nasal cavity, often displacing or working around the middle turbinate, to reach the back wall of the sphenoid sinus.
- A bony opening is made through the sphenoid sinus into the sella turcica (the bony pocket housing the pituitary).
- The dura is opened and the tumor/pituitary tissue is removed using specialized long instruments (like the second pink instrument shown), all guided by the endoscope's video feed rather than direct line-of-sight.
This approach is preferred today over the older microscope-and-lip-incision technique because it avoids facial incisions, minimizes disruption to nasal structures, and gives a wider, more panoramic view of the surgical corridor.
If you'd like, I can pull a labeled anatomical image of the sphenoid sinus/pituitary region or find a video walkthrough of this exact procedure for more detail.
Are you fucking sure
Searching Images
endoscopic transnasal transsphenoidal approach pituitary gland diagram nasal endoscope insertion
Fair question to push back on — let me actually verify this rather than assume my first read was right.
Searching the Web
diagram nasal endoscope insertion corrugated tube nasotracheal intubation guided
Searching Images
nasotracheal intubation fiberoptic endoscope through nose corrugated breathing circuit tube
Fair pushback — let me be straight about my confidence level rather than just repeating myself.
Was I sure? No, not 100%. I don't have the original source of this diagram (no caption, no textbook citation, no reverse image match — my search tools didn't return the exact figure). So I can't point to "this is Figure X from Textbook Y." What I gave you was an inference from the visual anatomy, and I should have flagged that more clearly the first time instead of stating it flatly.
That said, having gone back and scrutinized the details again, here's my honest reasoning for why the pituitary/transsphenoidal interpretation is still the most likely one, and why I'm not just doubling down out of stubbornness:
- The instrument in the nostril has an eyepiece held right up to the eye — that's the signature of a rigid nasal endoscope, the kind ENT/neurosurgeons use for endonasal skull-base work. Flexible fiberoptic scopes (used for nasotracheal intubation, the other plausible reading) don't have a fixed eyepiece like that — you'd see a thin flexible cable, not a rigid rod with a viewing port.
- The target structure in the cross-section sits high and posterior, at skull-base level (above the soft palate, behind the nasal cavity) — anatomically that's where the sphenoid sinus and pituitary fossa sit, not where the pharynx/larynx would be (which is lower, for an intubation diagram).
- A second instrument converging on the same target from a slightly different angle, with the surgeon's other hand steadying it at the nostril, is the classic depiction of the "two-handed" or "binostril" endoscopic technique — one nostril for the scope, one for a working instrument (sucker/dissector), both aimed at the same lesion. That's a very standard way this exact procedure gets illustrated.
So: I'm fairly confident, not certain. If you have the source of the image (textbook, slide deck, video), I'm happy to look it up specifically and confirm rather than rely on my own reading. If you tell me where this came from, I can verify against the actual reference.
This is a shared conversation. Sign in to Orris to start your own chat.