Oncocytes are found in all of the following organs, EXCEPT:
**Core Concept**
Oncocytic change, also known as oncocytes or Hurthle cells, is a type of cellular adaptation characterized by an accumulation of abnormal mitochondria, leading to an increase in cell size and a change in cell shape. This phenomenon is often seen in response to chronic stimulation or stress, such as in the presence of high levels of thyroid hormone.
**Why the Correct Answer is Right**
Oncocytic change is most commonly observed in the thyroid gland, where it is associated with conditions like Hurthle cell adenomas and carcinomas. The accumulation of mitochondria in oncocytes is thought to be an adaptive response to the high energy demands of the thyroid gland, which is responsible for producing thyroid hormones. In contrast, oncocytes are not typically found in the pancreas, as the pancreas is primarily composed of exocrine and endocrine cells that do not exhibit this type of cellular adaptation.
**Why Each Wrong Option is Incorrect**
**Option A:** **Thyroid gland** - Incorrect because oncocytes are actually found in the thyroid gland, particularly in conditions like Hurthle cell adenomas and carcinomas.
**Option B:** **Kidney** - Incorrect because oncocytes are not typically associated with the kidney, although they can be found in other organs such as the salivary glands and the adrenal cortex.
**Option C:** **Stomach** - Incorrect because oncocytes are not commonly found in the stomach, although they can be present in other parts of the gastrointestinal tract.
**Clinical Pearl / High-Yield Fact**
Oncocytic change is often associated with conditions where there is an increase in cellular energy demand, such as in the thyroid gland or in response to chronic stress. This phenomenon can be an important diagnostic clue in the evaluation of thyroid nodules or other neoplastic conditions.
**Correct Answer:** D.