The cells in the inner mucosal layer were taller than broader with oval nuclei giving the appearance of simple columnar epithelium
. Epithelium was composed of ciliated and nonciliated cells.
The nasal cavity and sinuses are lined with pseudostratified ciliated columnar epithelium
with goblet cells derived from the endoderm during intrauterine development of the maxillary or sphenoid sinuses in the middle trimester .
2 Histopathologically, lesions are composed of loose fibrous connective tissue stroma having stellate-shaped fibroblasts with areas of myxoid degeneration resembling dental papilla covered by peripheral columnar epithelium
which itself resembles inner enamel epithelium (covering of columnar epithelium
is absent in odontogenic myxomas and odontogenic fibromas).
The epithelium, which is simple columnar epithelium
, functions as both lining and also secretory epithelium.
Observed in (a): evidence of disorganization of the columnar simple epithelium in the gastric pits (enlarged detail, arrowhead) and gastric glands (arrows), congestion of the blood capillaries (enlarged detail, asterisk), and necrosis of the gastric mucosa cells (enlarged detail); in (b): preserved columnar simple epithelium in the gastric pits (enlarged detail) and well- preserved gastric glands (arrow); in (c): nonpreserved gastric mucosa with exfoliation of the simple columnar epithelium
(enlarged detail); in (d): gastric mucosa with slight focal exfoliations of the simple columnar epithelium
and preserved gastric mucosa (asterisk); and in (e): preserved gastric mucosa and simple columnar epithelium
The inner walls of the cyst were lined with columnar epithelium
and the cells contained PAS (Periodic Acid Schiff)-positive material in the apical cytoplasm.
Haematoxylin and eosin stained histopathologic section of nasal growths revealed myxomatous stroma filled with inflammatory cells and lined by regular respiratory epithelium (pseudostratified columnar epithelium
Pathological examination of the lesion revealed a benign paratubal cyst that was lined with ciliated tubal columnar epithelium
showing focal papillary projections.
Epidermal inclusion cysts can be caused by congenital factors, squamous metaplasia of columnar epithelium
, obstructed hair follicle or pore causing inflammatory downward growth of the epidermis, or trauma related to reduction mammoplasty or needle biopsy that causes epidermal fragments to be implanted more deeply in the breast tissue.
Cloacogenic carcinomas typically originate around the pectinate line of the anal canal, where the simple columnar epithelium
of the upper third meets the stratified squamous epithelium of the lower two-thirds.
The male paraurethral duct is lined with columnar epithelium
. [sup] However, postoperative pathological examination in the current study showed that paraurethral ducts were all lined with squamous epithelium, and it is possible that the columnar epithelium
had been destroyed by pathogens and replaced by squamous epithelium.