An oval lesion is found in the right lobe of the liver in an otherwise asymptomatic 24-year-old female. Surgical resection finds a single welldemarcated lesion that has a prominent, central, stellate white scar. This gross appearance is most consistent with a diagnosis of

**Core Concept**
The question describes a liver lesion with a specific gross appearance, which is a characteristic feature of a particular type of liver tumor. This tumor is a benign neoplasm that is often found incidentally in asymptomatic individuals.

**Why the Correct Answer is Right**
The lesion's appearance, with a single, well-demarcated mass and a prominent, central, stellate white scar, is typical of a hepatocellular adenoma (HCA). HCAs are benign tumors that arise from hepatocytes, and they often have a characteristic central scar. This scar is thought to result from a central area of necrosis and subsequent fibrosis. HCAs are usually found in young women and are often associated with oral contraceptive use.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the lesion's appearance does not match that of a hepatoblastoma, which is a malignant tumor that typically affects children and is characterized by a large, firm mass with a lobulated surface.

**Option B:** This option is incorrect because the lesion's appearance does not match that of a metastatic tumor, which would typically be multifocal and have a more irregular shape.

**Option C:** This option is incorrect because the lesion's appearance does not match that of a hemangioma, which is a benign vascular tumor that typically has a characteristic "light bulb" appearance on imaging studies.

**Clinical Pearl / High-Yield Fact**
It's worth noting that HCAs can be associated with a risk of rupture and hemorrhage, particularly if they are large or have a thin capsule. Therefore, it's essential to consider the possibility of an HCA in the differential diagnosis of a liver lesion, especially in young women.

**Correct Answer:** A. Hepatocellular adenoma.

✓ Correct Answer: B. Focal nodular hyperplasia