<unk>  may refer to one of several different tumors of epithelial origin. As the term "medulla" is a generic anatomic descriptor for the mid-layer of various organ tissues, a<unk>  tumor usually arises from the "mid-layer tissues" of the relevant organ.<unk>  most commonly refers to: *<unk>  thyroid cancer *<unk>  of the breast<unk>  may also refer to tumors of the: * Ampulla of Vater * Gallbladder * Kidney (Renal<unk>  * Large intestine * Pancreas * Stomach
Medullary carcinoma
Oncocytoma
Hibernoma
Adenomatoid tumor
Mycetoma
Adrenocortical carcinoma
Pineocytoma
Mastocytoma