Kaposiform hemangioendothelioma is an aggressive vascular tumor, named for its striking histologic resemblance to Kaposi sarcoma and locally invasive growth. Mortality is high, and ranges from 10% to 24% for all kaposiform hemangioendothelioma lesions, with a significantly higher mortality for deep soft-tissue or visceral lesions occurring in infants less than 6 months. Mediastinal and neck kaposiform hemangioendothelioma in particular merit special discussion, as involvement of these critical anatomic locations results in significant site-specific therapeutic challenges due to invasion of vital structures, inherent delays in establishing histopathologic confirmation, and difficulties in monitoring disease status. We report our experience with three cases of mediastinal and neck kaposiform hemangioendothelioma, emphasizing the unique diagnostic and management challenges, variable response to treatment and outcome of this anatomic variant of kaposiform hemangioendothelioma.

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The specific conductivity of 7.32N KOH electrolyte with zincate concentrations ranging from 0 to 1.5M has been measured. The electrolyte conductivity was found to decrease with increasing zincate concentration. This finding is consistent with predictions based on the mixture rule. The equivalent conductance of 7.32N potassium zincate of 7 • 5 mho 9 cm/equiv, may indicate the formation of neutral associated ion pairs from potassium and zincate ions in the electrolyte. Further calculations indicated that the mixture rule yields predictions of conductivities for the KF-KOH and K2COa-KOH systems that are in good agreement with experimental data in the literature.

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