Explain me antrochoanla polyp in a easier way
antrochoanal polyp nasal endoscopy CT scan
This composite clinical figure illustrates an antrochoanal polyp (ACP) through multi-modal imaging: endoscopy and computed tomography (CT). Panel (a) shows an endoscopic view of the left nasal cavity, identifying a smooth, pale mass located inferiorly at the level of the inferior meatus, adjacent to the inferior turbinate. Panel (b) is a coronal CT scan in a soft tissue window demonstrating a large cystic-appearing mass occupying the maxillary antrum. Panel (c) provides a coronal bone window CT, highlighting a focal defect in the medial wall of the maxillary sinus situated below the inferior turbinate, serving as the exit point for the polyp into the nasal cavity. Panel (d) displays an axial CT scan where the soft tissue mass is seen extending posteriorly from the nasal cavity into the nasopharynx. This sequence demonstrates the characteristic tri-compartmental progression of an ACP from the maxillary sinus, through the nasal meatus, and into the choana/nasopharynx, including rare inferior meatus involvement.
This diagnostic image is a non-enhanced coronal CT scan of the paranasal sinuses demonstrating a large antrochoanal polyp. The key visual finding is a significant soft tissue density (opacification) completely filling the left maxillary sinus and extending through a widened maxillary ostium into the left nasal cavity. A red arrow highlights a large, well-defined polypoidal mass within the left nasal fossa, which is causing local mass effect. Secondary findings include a significant deviation of the nasal septum toward the right side and compensatory hypertrophy of the right inferior turbinate (concha). The left inferior turbinate appears displaced and indented by the encroaching polypoidal mass. The sphenoid and frontal sinuses appear clear on this section. This image serves as a classic educational example of sinonasal polyposis and obstructive nasal pathology, illustrating the characteristic 'dumbbell' appearance of an antrochoanal polyp as it herniates from the sinus antrum into the nasal passage.
This diagnostic image is a non-contrast axial CT scan of the paranasal sinuses at the level of the maxillary antrum. The scan reveals a large, well-defined soft tissue density mass (indicated by a red arrow) within the left nasal cavity, characteristic of an antrochoanal polyp. This polypoidal lesion originates from the left maxillary sinus, which demonstrates complete opacification and widening of the maxillary ostium. There is evidence of mild bony remodeling of the left maxillary sinus walls. The mass extends anteriorly, causing significant obstruction of the left nasal passage and lateral displacement of the left inferior turbinate. Secondary findings include a marked diffuse deviation of the nasal septum toward the right side and compensatory hypertrophy of the right inferior turbinate. In contrast, the right maxillary sinus is well-aerated with normal mucosal thickness and clear ostiomeatal complex structures. This image serves as a clinical example of sinonasal polyposis and mechanical obstruction of the nasal airway, relevant for otolaryngology and radiology education.
This diagnostic image is a non-contrast coronal CT scan of the paranasal sinuses demonstrating a large left-sided antrochoanal polyp. The left maxillary sinus shows total opacification and mild bony remodeling. This opacification extends through a significantly widened left maxillary ostium (indicated by a red arrow) into the left nasal cavity, representing the typical 'dumbbell' configuration of an antrochoanal polyp. Within the nasal cavity, a large polypoidal soft tissue mass obstructs the middle and inferior meatus, causing displacement of the left inferior turbinate and partial opacification of the middle meatus. The left uncinate process and hiatus semilunaris are obscured by mucosal thickening. The nasal septum is deviated toward the right. In contrast, the right maxillary sinus, ostium, and ethmoid air cells are clear and well-pneumatized, providing a healthy anatomical comparison. This image serves as a classic educational example of sinonasal polyposis and obstructive sinus pathology in otolaryngology.
Antrochoanal Polyp (ACP) - Made Simple
What Is It? (The Simple Analogy)
- Antro = antrum (maxillary sinus)
- Choanal = choana (back of the nose/throat junction)
Where Does It Start?
Key Features at a Glance
| Feature | Detail |
|---|---|
| Origin | Maxillary sinus (cheek sinus) |
| Direction | Grows backward toward the throat |
| Side affected | Almost always ONE side only (unilateral) |
| Number | Always a SINGLE polyp |
| Who gets it | More common in children & young adults (unlike regular nasal polyps which are in older adults) |
| Shape on CT | "Dumbbell" - two bulges connected by a narrow neck |
How Is It Different from Normal Nasal Polyps?
| Regular Nasal Polyps | Antrochoanal Polyp | |
|---|---|---|
| Origin | Ethmoid sinuses (between eyes) | Maxillary sinus (cheek) |
| Number | Multiple | Single |
| Side | Both sides (bilateral) | One side only |
| Age group | Middle-aged adults | Children & young adults |
| Appearance on scope | Pale, grape-like clusters | Single large fleshy mass going back toward throat |
Symptoms - What Does the Patient Feel?
- One-sided nasal blockage (can't breathe through one nostril)
- Feeling of something at the back of the throat - the patient may notice a lump dangling in the throat
- Runny nose, postnasal drip
- In children: may cause snoring or mouth breathing
- Pain is usually NOT a prominent feature
What Does It Look Like on Imaging?
Treatment - How Is It Treated?
- A camera is inserted into the nose (no external cuts)
- The surgeon removes not just the nose part, but also the part inside the maxillary sinus - this is the most important step
- If the antral (sinus) portion is left behind, it WILL come back (recur)
Simple Summary in 3 Lines
An antrochoanal polyp is a single, benign fleshy lump that starts in the maxillary (cheek) sinus, squeezes through the sinus opening into the nose, and hangs backwards into the throat. It mainly affects one side, mostly in young people, and causes one-sided nasal blockage. Treatment is surgical removal (FESS), and to prevent recurrence, the part inside the sinus must be completely removed.