Exophytic papilloma shows delicate fibrovascular cores covered by epithelium that varies between three types: squamous; ciliated, pseudostratified
columnar respiratory type epithelium; and transitional epithelium (figure 2).
On necropsy of camel 1 at 5 dpi, histologic lesions were found in the pseudostratified
epithelial cells in the URT and the lower respiratory tract (trachea, bronchi, and bronchioles) but not in the alveoli (Figure 5).
Usual intraductal hyperplasia (UDH) was characterized by an increase in monomorphic ductular epithelial cell layers ([greater than or equal to] 3 cells thick) typified by cuboidal or columnar pseudostratified
epithelial cells that maintained a perpendicular orientation around the basement membrane.
Histological sections revealed fibrocollagenous cyst walls bilaterally, lined by pseudostratified
ciliated columnar epithelium with areas of squamous metaplasia.
Normally, most of the lower respiratory tract is lined with pseudostratified
, ciliated, columnar epithelium.
Lack of vitamin A also causes squamous metaplasia, a condition in which the normal pseudostratified
, columnar, ciliated respiratory epithelium, which protects the lungs, ears, gut, and most mucous membranes, metamorphoses into squamous cells as on our skin, which doesn't protect these internal structures and can lead to disease.
Cytologically, the neoplastic cells can vary from having scant amphophilic cytoplasm with nuclei typically arranged in a single cell layer (so called type 1 papillary RCC) to having abundant highly eosinophilic cytoplasm with pseudostratified
nuclei (type 2 papillary RCC).
The epididymis tubule has a pseudostratified
columnar epithelium with cilia and individual spermatozoa scattered in the lumen (Fig.
Laryngeal tissue is comparable to tracheal tissue, except for the vocal cords; the outer layer of the vocal cords consists of perichondrium and connective tissue, and the inner layer contains cartilage covered with mucosal epithelium consisting mainly of pseudostratified
The EDs is made of a series of tubules, having a lumen inside enclosed with a single layer of columnar or pseudostratified
columnar epithelial cells (Hamilton, 1975; Jones and Jurd, 1987) (Figure 3C).
Histopathologic examination revealed that the cyst was formed by a thick, well vascularized connective tissue wall lined by a disorganized, pseudostratified
, low cuboidal to stratified squamous epithelium that was eroded multifocally.
Histologically, the lesion has a fibromuscular wall that is lined by cuboidal epithelium, although, rarely, lesions may be lined with pseudostratified
epithelium and cilia.