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Common sites for squamous metaplasia include the bladder and cervix. Smokers often exhibit squamous metaplasia in the linings of their airways. These changes don't signify a specific disease, but rather usually represent the body's response to stress or irritation. Vitamin A deficiency or overdose can also lead to squamous metaplasia. [1]
Cytology of reactive mesothelium, with typical features. The main causes of reactive mesothelium are infection, trauma and cancer. [3] Wright's stain. The mesothelium is composed of an extensive monolayer of specialized cells (mesothelial cells) that line the body's serous cavities and internal organs.
The endothelium (pl.: endothelia) is a single layer of squamous endothelial cells that line the interior surface of blood vessels and lymphatic vessels. [1] The endothelium forms an interface between circulating blood or lymph in the lumen and the rest of the vessel wall.
In normal epithelial tissues, epithelial cells, or parenchymal cells of epithelia, are highly organized, polar cells. [5] These cells are separated from stromal cells by a basement membrane that prevents these cell populations from mixing. [5] A mixture of these cell types is recognized, normally, as a wound, as in the example of a cut to the ...
Simple squamous epithelium falls under the physiological category of exchange epithelium due to its ability to rapidly transport molecules across the tissue layer. To facilitate this movement, some types of simple squamous epithelium may have pores between cells to allow molecules to move through it, creating a leaky epithelium.
ThinPrep pap smear with group of normal cervical cells on left and HPV-infected cells showing features typical of koilocytes: enlarged (x2 or x3) nuclei and hyperchromasia. A koilocyte is a squamous epithelial cell that has undergone a number of structural changes, which occur as a result of infection of the cell by human papillomavirus (HPV). [1]
Barrett's esophagus is a condition in which there is an abnormal (metaplastic) change in the mucosal cells lining the lower portion of the esophagus, from stratified squamous epithelium to simple columnar epithelium with interspersed goblet cells that are normally present only in the small intestine and large intestine.
Reactive follicular hyperplasia, Lymphoid nodular hyperplasia Follicular hyperplasia (FH) is a type of lymphoid hyperplasia and is classified as a lymphadenopathy , which means a disease of the lymph nodes.