Tumors are considered invasive if they extend through the muscularis layer and into the submucosa .
Beneath the mucosa, there is a loose connective tissue layer called the submucosa .
Between the mucosa and muscle layers lies the submucosa , which is rich in blood vessels and connective tissue.
The most prominent inflammatory cells in the bronchial submucosa were lymphocytes, but their numbers changed little during exacerbations.
Some of the nodules were located in the submucosa beneath areas of mucosal ulceration, but did not show communication with or disruption of the mucosa.
The smallest air-conducting vessels, the bronchioles, are distinguished by having no cartilage in their walls, no mucus cells in their epithelium, and few or no submucosal glands.
The lesion appeared to be submucosal with an intact submucosa and muscularis propria interface.
The cause of death was excessive infusion and absorption of normal saline during hysteroscopic ablation of submucosal leiomyoma for menorrhagia.
Pathologic findings in fatal asthma include bronchial lumen occlusion by mucus, hyperplasia of submucosal glands, basement membrane thickening, and tissue eosinophilia.
Biopsies of the pharynx, performed after radiotherapy, showed infiltration of small lymphocytes, plasmacytes, and neutrophils in the submucosal area.