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).
A) Posterior segment of the mid-gut (S3) with mucosa presenting a simple columnar epithelium
with supranuclear vacuoles (sv), some goblet cells (arrowhead) and lymphocytes (arrow).
In this period, stratified epithelium differentiates into a single-layer columnar epithelium
It consists of two side lobes, delimited by a ciliated columnar epithelium
with oval and basal nuclei.
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.
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.
The cell nuclei may be disposed at different levels allowing for a pseudocellular stratification, a characteristic of the pseudos-tratified columnar epithelium
which can be ciliated (trachea, upper respiratory tract) or not (penile urethra).
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.
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.
I recently demonstrated that intestinal lamina propria resident DCs migrate towards and extend cellular processes between the tight junctions of columnar epithelium
through a CCR5-dependent mechanism, take up R5 but not X4 HIV-1, and then transfer infection to susceptible T cells.
The endometrium consisted of simple columnar epithelium
and an underlying connective tissue stroma with glands (Fig-1a).
Histopathologically it is lined by pseudostratified columnar epithelium
(one to four cell layers thick) mimicking the transitional epithelium of the urethra.
Barrett's esophagus (BE) is defined as a condition of the lower esophagus in which the normal squamous epithelium is replaced by columnar epithelium
as a result of chronic gastroesophageal reflux (GERD) (1).
The mucosal surface consists of simple columnar epithelium