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.
1 Beets, blackberries and rhubarb can turn urine red or pink.  Medications. Rifampin (Rifadin, Rimactane), an antibiotic often used to treat tuberculosis, can turn urine reddish orange â as can phenazopyridine (Pyridium), a drug that numbs urinary tract discomfort, and laxatives containing senna.