Fig. 2
From: Classification of nasal polyps and inverted papillomas using CT-based radiomics
Handcrafted annotation CT images of IP and NP. a IP; b NP. Axial noncontrast CT scans of the paranasal sinuses demonstrate a mass filling the right nasal cavity and extending into the maxillary sinus. a The right middle nasal cavity is filled with soft tissue-like density lesion; the right middle nasal meatus is enlarged, and the right middle and lower turbinates are displaced. The right maxillary sinus and nasal mucosa are thickened, and a little gas density shadow can be seen; the nasal septum is partially deflected to the left. b Soft tissue density lesion filling can be seen in the right maxillary sinus and nasal meatus; the nasal meatus is narrow, and the lesion protrudes backward to the posterior naris. No significant absorption or destruction of the bone in the residual sinus wall is observed; the left maxillary sinus is well gasified, and the sinus cavity is clearly displayed; the nasal septum is in the middle