Nodular Regenerative Hyperplasia of the Liver in Rheumatic Disease: Cases and Review of the Literature.

Nodular regenerative hyperplasia (NRH) is a rare disease that is characterized by benign transformation of the hepatic parenchyma into small nodules with little to no fibrosis. Nodular regenerative hyperplasia is a cause of noncirrhotic portal hypertension. Symptoms can range from asymptomatic disease to more serious complications of portal hypertension such as esophageal varices and ascites. Nodular regenerative hyperplasia has been described in association with a variety of different rheumatologic, hematologic, and oncologic diseases, as well as in immune deficiency states and with exposures to certain toxins. Diagnosis is made by histology, and the treatment involves addressing the underlying disease. The first description of this rare disease was actually described in a patient with rheumatoid arthritis, neutropenia, and splenomegaly (Felty's Syndrome). We describe 2 cases of NRH associated with underlying rheumatic disorders, in one of which NRH was actually the presenting feature of the patient's underlying autoimmune condition. Subsequently, we provide a brief review of the literature of NRH in autoimmune disease with respect to epidemiology, cause, clinical manifestations, diagnosis, and treatment.