Hepatic Adenoma

A hepatic adenoma, also called a hepatocellular adenoma or liver adenoma, is a usually benign growth made up of liver cells. Many are found incidentally during imaging tests performed for another reason and do not cause symptoms. They are most common in women of reproductive age, especially with certain hormone exposures, and can also occur in people with metabolic or inherited risk factors. Although an adenoma is usually noncancerous, medical evaluation and follow-up are important because some can grow, bleed, or rarely develop cancerous features.

Many hepatic adenomas cause no symptoms and are discovered during an ultrasound, CT scan, or MRI done for another reason. Symptoms are more likely when a lesion grows, presses on nearby tissue, or bleeds.

Hepatic adenomas form when liver cells grow abnormally, but the exact cause is not always identifiable. Changes in the cells’ growth-control pathways can lead to a benign tumor, sometimes in association with hormones, metabolic conditions, or inherited disorders.

Hormones, subtypes, and abnormal cell growth

Estrogen-containing contraception, anabolic steroid use, and pregnancy-related hormonal changes may encourage some adenomas to grow. Obesity, insulin resistance, metabolic syndrome, and glycogen storage disease are also associated with hepatic adenomas. Molecular subtypes, such as inflammatory or beta-catenin–activated adenomas, have different patterns of growth, bleeding risk, and possible malignant potential. These associations do not mean that every case has one preventable cause or that a person caused the tumor.

Hepatic adenomatosis means that multiple hepatic adenomas are present, rather than one solitary liver adenoma. The number of lesions can affect imaging, monitoring, and treatment decisions.

Having one of these factors does not prove that it caused liver adenomas. Do not stop birth control, hormone therapy, or any other prescribed medicine without discussing the benefits and risks with a clinician.

Clinicians review your medical history, hormone and steroid exposure, symptoms, liver test results, and the reason the lesion was found. This information helps guide the choice of imaging and determine whether specialist review is needed.

In hepatic adenoma radiology, specialists assess the lesion’s size, number, location, enhancement pattern, bleeding, and fat content. Imaging may suggest a particular hepatocellular adenoma subtype or raise concern for another diagnosis, including a malignant liver tumor. Ultrasound findings can be helpful, but MRI or multiphase CT often provides more detailed characterization than ultrasound alone.

Monitoring and risk-factor changes

Smaller, stable, lower-risk lesions may be managed with individualized imaging follow-up. A clinician may review estrogen-containing medicines and anabolic steroids, address metabolic health, and discuss pregnancy planning with a liver specialist or other appropriate specialist. Medicines should not be stopped or changed without medical advice.

When a procedure or surgery may be recommended

Resection, embolization for active bleeding, ablation in selected cases, or another specialist procedure may be considered when a lesion causes symptoms, enlarges, is large, is multiple, bleeds, or has higher-risk imaging or molecular features. The choice depends on the lesion’s anatomy, number, subtype, bleeding risk, and your overall health.

There is no routine screening test for hepatic adenoma in people without symptoms or recognized risk factors. Prevention steps may reduce risk or growth in some people, but they cannot eliminate inherited or unavoidable risks.

Many hepatic adenomas remain stable or shrink after a contributing hormone exposure is reduced, while some require long-term monitoring or treatment. The outlook depends on lesion size, growth, symptoms, bleeding risk, pregnancy-related changes, subtype, and whether one or multiple lesions are present. Follow-up is important even when a liver adenoma causes no symptoms.