Antrochoanal polyp | Radiology Reference Article - Radiopaedia.org
2023年6月26日 · Antrochoanal polyps (ACP) are solitary sinonasal polyps that arise within the maxillary sinus (antrum). They pass through and enlarge the sinus ostium and posterior nasal cavity at the level of the choana .
Sinonasal polyposis | Radiology Reference Article - Radiopaedia.org
2022年11月10日 · Sinonasal polyposis refers to the presence of multiple benign polyps in the nasal cavity and paranasal sinuses. Sinonasal polyposis is most commonly encountered in adults and rare in children. Polyps are the most common expansile lesions of the nasal cavity 8. Conditions known to be associated with polyps include 10:
The Radiology Assistant : MRI of the Paranasal Sinuses
2009年2月25日 · When pathology approaches the orbital apex, an MRI study is necessary to assess spread to the cavernous sinus and intracranial compartment. CT is performed without contrast medium. If additional imaging is necessary, orbital MRI is the next step.
Imaging features of benign mass lesions in the nasal cavity and ...
2018年4月25日 · Sinonasal inflammatory polyp often originates from the maxillary sinus. Inflammatory polyp is caused by allergy, vasomotor rhinitis, infections, cystic fibrosis, aspirin intolerance, or nickel exposure. Fluid accumulation in the …
Sinonasal polyposis | Radiology Case - Radiopaedia.org
Partial opacification of both maxillary and sphenoid sinuses and near total opacification of both frontal sinuses and ethmoid air cells with soft tissue density contents, mucosal thickening, retained secretions and retention cysts.
Radiology of Sinonasal Tract Lesions/Tumours | SpringerLink
2023年2月24日 · X-ray PNS Water’s view shows complete opacification of bilateral maxillary sinuses (arrow), frontal (asterisk) and bilateral ethmoidal sinuses suggestive of sinusitis. Chronic sinusitis is characterized by opacification of the sinuses, mucosal thickening, bony sclerosis and intrasinus calcification (antrolith formation) (Fig. 2.2).
Radiologic Imaging of Nasal Polyposis | SpringerLink
2024年7月4日 · Axial CT shows innumerable polyps in the maxillary sinus in a patient with NP. Some of the polyps are pedunculated (arrow), distinguishing them from mucus retention cysts (MRCs). The inspissated secretions between the polyps have increased density, which reverses the normal density pattern seen in Fig. 1
MR Evaluation of Sinonasal Angiomatous Polyp - PMC
2011年7月1日 · All 40 SAPs originated from the maxillary sinus, but the lesions frequently extended into the ipsilateral nasal cavity (38/40), toward the choana (19/40), and into the nasopharynx (8/40). The lesions demonstrated hypointensity on T1WI and heterogenous hyperintensity on T2WI. All 40 lesions showed a peripheral hypointense rim on T2WI.
CT and MR imaging findings of sinonasal angiomatous polyps
2013年6月17日 · CT and MR imaging findings of 15 patients with pathologically proven SAP were examined. Assessed image features included location, size, margin, attenuation, and change of the bony walls of the sinonasal cavity on CT, and signal intensity and enhancement pattern on MR. On CT, the SAP was mostly isoattenuated with patches of slight hyperattenuation.
Maxillary tori may appear as pathological radiopacities in the sinus but below the image of the hard palate. The angle at which the radiograph is taken may make the roots appear to project further into the sinus. The roots usually lie buccally to the sinus and are separated from the sinus by a thin plate of bone.
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