Summary

Newton-Wellesley Hospital in Massachusetts is investigating after five nurses from its fifth-floor maternity unit were diagnosed with benign brain tumors. The tumors, all benign, are three different types, the hospital said. A total of 11 staff reported health concerns.

The hospital, in collaboration with government agencies, found no environmental risk after testing possible sources like water, masks, and nearby medical treatments.

The Massachusetts Nurses Association disputes the hospital’s findings, citing limited nurse interviews and incomplete testing. The union is conducting an independent investigation.

Federal agencies have not commented. The American Cancer Society notes that such clusters require specific criteria to indicate a common cause.