Unclassified hepatocellular adenoma with histological brown pigment deposition and serum PIVKA-II level elevation: a case report by Kouki Hoshino, Norifumi Harimoto, Ryo Muranushi, Kei Hagiwara, Takahiro Yamanaka, Norihiro Ishii, Mariko Tsukagoshi, Takamichi Igarashi, Akira Watanabe, Norio Kubo, Kenichiro Araki, Ran Tomomasa, Sumihito Nobusawa, Shinichi Aishima, Osamu Nakashima, Ken Shirabe

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