teratoma. [terâ²ÉtÅâ²mÉ] pl. teratomas, teratomata. a tumor composed of different kinds of tissue, none of which normally occurs together or at the site of the tumor. Teratomas are most common in the ovaries or testes.
The pink-colored film or ring frequently seen on showers, tubs, toilets and pet water bowls is typically caused by growth of the airborne bacteria Serratia marcesens. This harmless nuisance organism reacts with standing water and frequently forms during spring and summer months.
A carbol fuschin counter-stain is then applied which stains the Gram-negative bacteria pink. Modifications: The Brown-Hopps and Brown-Brenn stains are modifications of the Gram stain and are used for demonstration of gram negative bacteria and rickettsia.