Vij, MukulPatra, SushmaRela, Mohamed2013-03-182013-03-182012-10Vij Mukul, Patra Sushma, Rela Mohamed. Pigmented hepatocellular adenoma with complete CD34 immunostaining pattern: A diagnostic dilemma. Indian Journal of Pathology & Microbiology. 2012 Oct-Dec 55(4): 528-530.http://imsear.searo.who.int/handle/123456789/145653WHO defines hepatocellular adenoma (HCA) as a benign tumor composed of cells closely resembling normal hepatocytes, which are arranged in plates separated by sinusoids. It is more common in women. The present concerns a 41 years female who was found to have a mass lesion in liver on ultrasound while undergoing routine evaluation for dyspepsia. Computed tomography scan of abdomen showed 10 × 8 cm lesion in liver. Extended left hepatectomy was performed. Grossly hepatic cut surface showed circumscribed tumor with dark gray or black color. Microscopy revealed hepatocellular adenoma with abundant Dubin Johnson like pigment deposition. CD34 immunostaining showed complete sinusoidal pattern. We labeled the tumor as pigmented hepatic adenoma with complete CD34 staining pattern. To the best of author's knowledge only eight cases of pigmented hepatocellular adenoma are described in world literature.enAdenomaCD34hepatocellularimmunohistochemistrypigmentArticle