April 30, 2016 | Jacky Wai-Kei Lam, MBBS(HK), FHKCORL, FHKAM(ORL); Leah Lai Lau, MBBS(HK)
The differential diagnosis of sinonasal pathologies with highly radiodense materials includes rhinolith, mycetoma, inverted papilloma with calcifications, chondrosarcoma, osteosarcoma, and fibro-osseous lesions.
June 5, 2015 | Mohammad Farhadi, MD; Mitra Barati, MPH; Azardokht Tabatabaii, MS; Mehdi Shekarabi, PhD; Samileh Noorbakhsh, MD; Shima Javadinia, MD
The pathogenesis of nasal polyps has been debated for many years. The lymphocytes that infiltrate nasal polyps have been identified as predominantly memory T cells in an activated state, and these cells produce a mixed cytokine pattern of T1 helper (Th1) and T2 helper (Th2)...
We conducted a prospective study to investigate the role of matrix metalloproteinase-2 (MMP-2), matrix metalloproteinase-9 (MMP-9), and tissue inhibitor of metalloproteinase-1 (TIMP-1) in the pathogenesis of nasal polyps. Our study group consisted of 24 patients-21 men and 3...
Most polyps in the nasal cavity develop from the mucosa of the anterior ethmoid sinus, the contact areas of the uncinate process, and the middle turbinate so that they are observed in the middle meatus.
February 12, 2014 | Ali Ozdek, MD; Halil Erdem Ozel, MD
Most choanal polyps arise from the maxillary sinus, and they are called antrochoanal polyps. Their typical endoscopic and radiologic appearance makes them easy to diagnose. However, some choanal polyps originate in unusual sites in the paranasal sinuses and nose, such as...