transitional cell

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Related to transitional cell: transitional epithelium

tran·si·tion·al cell

any cell thought to represent a phase of development from one form to another.
Farlex Partner Medical Dictionary © Farlex 2012

T cell

A specialised myocyte found in clusters in the sinus node, which is intermediate in size, structure, and organisation between P cells and normal atrial myocytes, and connect swith either of these cells; perinodal T cells surround the sinus tract and are thought to “bundle” impulses leaving the sinus node and to filter premature ectopic atrial impulses.

A thymus-derived white cell responsible for cell-mediated immunity and immunoregulation which is the most complex cell of the immune system, given:
(1) The diversity of T-cell types, including T cells with activator, cytotoxic, delayed hypersensitivity and suppressor activities;
(2) The wide range of cytokines, growth factors and immune modulators produced by activated T cells;
(3) The complexity of T-cell interaction with exogenous and endogenous antigens (e.g., mediation of delayed hypersensitivity, graft-versus-host disease);
(4) The complexity of T-cell maturation in the thymus.

50 to 70% of circulating WBCs are granulocytes (neutrophils); the rest are lymphocytes, of which T cells (defined as having “pan T cell” markers), CD2 and CD7 and other T-cell markers (e.g., CD1, CD3, and CD5) comprise 70 to 85%; B cells comprise 15 to 30%.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

transitional cell

The stretchable epithelial cells that compose the transitional epithelium (uroepithelium), which lines most of the urinary tract. Transitional cells are strongly interconnected. They are cuboidal when not under pressure, and they become flattened and squamous when stretched. Transitional epithelia are 4-6 cells thick, and the top transitional cells -- those on the lumenal surface -- fuse to become larger and polyploid.
See also: cell
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Percutaneous renal surgery and local radiotherapy in the management of renal pelvic transitional cell carcinoma.
Problems arising in the diagnosis of primary ovarian transitional cell carcinoma after the occurrence of a transitional cell carcinoma of the bladder: a report of a difficult case and a critical review of literature.
Demkov et al., "Phase III trial of vinflunine plus best supportive care compared with best supportive care alone after a platinum-containing regimen in patients with advanced transitional cell carcinoma of the urothelial tract," Journal of Clinical Oncology, vol.
Five-year cancer-specific survival rate of patients with high-grade transitional cell carcinoma is 35% [11].
Villavicencio, "Percutaneous nephroscopic management of upper urinary tract transitional cell carcinoma: recurrence and long-term followup," The Journal of Urology, vol.
Kong et al., "Transitional cell carcinoma with extension of the renal vein and IVC tumor thrombus: report of three cases and literature review," World Journal of Surgical Oncology, vol.
The World Health Organization/ International Society of Urological Pathology consensus classification of urothelial (transitional cell) neoplasms of the urinary bladder.
Expression of matrix metalloproteinase-10 in human bladder transitional cell carcinoma.
Bostwick et al., "Expression of cyclooxygenase-2 (COX-2) in human invasive transitional cell carcinoma (TCC) of the urinary bladder," Cancer Research, vol.
Caption: Figure 4: Nests of polygonal cells surrounded by stroma reaction of transitional cell carcinoma (arrow: mitotic figure), higher magnification.
Duplex system is also prone to development of renal pelvis carcinomas as compared to normal kidney as was in our literature only four cases of renal cell carcinoma have reported so far which were associated with duplex kidney but these were either multicystic transitional cell carcinomas of renal pelvis or one case of cystic renal cell sarcomatoid carcinoma.
Histopathologically, it turned out to be liposarcomatoid variant of transitional carcinoma, a biphasic tumour composed of transitional cell carcinoma and sarcomatous component.

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