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Abstract: Malignant retroperitoneal fibrosis can be associated with variable kinds of cancers. But, malignant retroperitoneal fibrosis with gallbladder carcinoma has been rarely reported. Here we present a case report of malignant retroperitoneal fibrosis with gallbladder adenocarcinoma, causing bilateral ureteral obstruction, duodenal obstruction, and narrowing of inferior vena cava. [Copyright &y& Elsevier]

Abstract: Signet ring cell carcinoma of the gallbladder is a rare variant of adenocarcinoma of the gallbladder. CT findings of signet ring cell carcinoma have been rarely reported. However, to our knowledge, signet ring cell carcinoma of the gallbladder with intramural tumoral calcifications has not been reported. Here, we present a case of mucin-producing signet ring cell carcinoma of the gallbladder which appeared as low attenuated diffuse gallbladder wall thickening with intramural calcifications and metastatic conglomerated lymphadenopathy. [Copyright &y& Elsevier]

Abstract: Undifferentiated carcinoma of the liver is very rare. Undifferentiated carcinomas with osteoclast-like giant cells or neuroendocrine features have been reported. As far as we know, undifferentiated carcinoma of the liver with extensive choriocarcinoma component has not been reported. Here we present a case report of undifferentiated carcinoma of the liver with extensive choriocarcinoma component in an old man. US and multiphasic contrast-enhanced CT showed a heterogenous hypovascular mass in spite of the extensive choriocarcinoma component, probably due to necrosis and poorly differentiated portion of the tumor. [Copyright &y& Elsevier]