Trichosomoides nasalis (arrows) in tissues of the nasal cavities. A, in the lamina propria, a worm in longitudinal section, at level of stichocytes. Note the large longitudinal vessel below, and another worm on left in the connective tissue. B, worm in a blood vessel of the lamina propria (V = blood vessel). C, four worms situated around the median concha, in the lamina propria (1), a blood vessel (2) and the pseudostratified epithelium (3), respectively. Scale bars in μm: A, 75; B, 30; C, 100.