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Atypia (from Greek, a + typos, without type; a condition of being irregular or nonstandard) [1] is a histopathologic term for a structural abnormality in a cell, i.e. it is used to describe atypical cells. Atypia can be caused by infection or irritation. If, for example it were diagnosed in a Pap smear in the uterus it is more likely to be ...
A rare type of rhabdomyosarcoma that is found in adults is known as pleomorphic rhabdomyosarcoma. [4] Despite the prevalence of pleomorphism in human pathology, its role in disease progression is unclear. In epithelial tissue, pleomorphism in cellular size can induce packing defects and disperse aberrant cells. [5]
Koilocytosis or koilocytic atypia or koilocytotic atypia are terms used in histology and cytology to describe the presence of koilocytes in a specimen. [1] Koilocytes may have the following cellular changes: Nuclear enlargement (two to three times normal size). Irregularity of the nuclear membrane contour, creating a wrinkled or raisinoid ...
Find out what typical and atypical antipsychotics are, what they are used for, how they work, and their potential risks and benefits.
Individual cellular features of dysplasia are called epithelial atypia. [ 2 ] Examples of epithelial dysplasia include cervical intraepithelial neoplasia – a disorder commonly detected by an abnormal pap smear ) consisting of an increased population of immature (basal-like) cells which are restricted to the mucosal surface, and have not ...
Nuclear atypia refers to abnormal appearance of cell nuclei. It is a term used in cytopathology and histopathology. Atypical nuclei are often pleomorphic. Nuclear atypia can be seen in reactive changes, pre-neoplastic changes and malignancy. Severe nuclear atypia is, in most cases, considered an indicator of malignancy.
It is commonly known as "walking pneumonia" because its symptoms are often mild enough that one can still be up and about. [18] [19] "Atypical pneumonia" is atypical in that it is caused by atypical organisms (other than Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis). [20]
In adults, absolute lymphocytosis is present when the lymphocyte count is greater than 5000 per microliter (5.0 x 10 9 /L), in older children greater than 7000 per microliter and in infants greater than 9000 per microliter. [1] Lymphocytes normally represent 20% to 40% of circulating white blood cells. When the percentage of lymphocytes exceeds ...