Clinical and pathologic features of 23 patients with a distinctive histologic and clinical variant of hepatocellular carcinoma are summarized. The variant pattern of hepatocellular carcinoma is most common in the age group 5--35 years and occurs equally in either sex. The distinctive histologic features include 1) deeply eosinophilic neoplastic hepatocytes, many of which contain intracytoplasmic hyaline globules and distinct pale bodies and 2) fibrosis arranged in a lamellar fashion around the neoplastic hepatocytes. The histologic and gross features of the tumor have been confused both with focal nodular hyperplasia and with hepatocellular adenoma. The average survival of 32 months and the high operability rate of 48% far exceed the survival or operability for ordinary hepatocellular carcinoma. Thus, this tumor type must be recognized and considered separately when evaluating therapeutic results in large series of patients with hepatocellular carcinoma.

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In April 1996, laboratory testing of imported nonhuman primates (as mandated by quarantine regulations) identified 2 cynomolgus macaques (Macaca fascicularis) infected with Ebola (subtype Reston) virus in a US-registered quarantine facility. The animals were part of a shipment of 100 nonhuman primates recently imported from the Philippines. Two additional infected animals, who were thought to be in the incubation phase, were identified among the remaining 48 animals in the affected quarantine room. The other 50 macaques, who had been held in a separate isolation room, remained asymptomatic, and none of these animals seroconverted during an extended quarantine period. Due to the rigorous routine safety precautions, the facility personnel had no unprotected exposures and remained asymptomatic, and no one seroconverted. The mandatory quarantine and laboratory testing requirements, put in place after the original Reston outbreak in 1989-1990, were effective for detecting and containing Ebola virus infection in newly imported nonhuman primates and minimizing potential human transmission.