Consider the following – Carcinoma of the stomach Obesity Insulin resistance Hemochromatosis Which of the above is/are associated with acanthosis nigricans?
**Core Concept**
Acanthosis nigricans is a skin condition characterized by dark, velvety skin patches, typically in the folds and creases of the body. It is associated with insulin resistance and hyperinsulinemia, which can be caused by various underlying conditions.
**Why the Correct Answer is Right**
Acanthosis nigricans is often seen in conditions that lead to insulin resistance, such as obesity and type 2 diabetes. In this context, the skin condition is a manifestation of the body's attempt to compensate for insulin resistance by producing more insulin. The insulin binds to insulin receptors on the skin cells, leading to increased growth factor production and subsequent skin thickening. Hemochromatosis, a genetic disorder causing excessive iron accumulation, can also lead to insulin resistance and acanthosis nigricans due to the toxic effects of excess iron on pancreatic beta cells.
**Why Each Wrong Option is Incorrect**
**Option A:** Carcinoma of the stomach is not typically associated with acanthosis nigricans. While certain cancers can cause paraneoplastic syndromes, acanthosis nigricans is more commonly linked to metabolic disorders.
**Option B:** Obesity is indeed associated with acanthosis nigricans, but it is not the only correct answer. Obesity is a major risk factor for insulin resistance and type 2 diabetes, both of which can cause acanthosis nigricans.
**Option D:** Hemochromatosis is associated with acanthosis nigricans, but it is not the only correct answer. Hemochromatosis can lead to insulin resistance and pancreatic damage, which in turn can cause acanthosis nigricans.
**Clinical Pearl / High-Yield Fact**
Acanthosis nigricans can be a useful marker for underlying insulin resistance and metabolic syndrome. It is often seen in patients with obesity, type 2 diabetes, and polycystic ovary syndrome (PCOS).
**Correct Answer: C. Hemochromatosis**