1 Department of Pediatrics, West Virginia University School of Medicine, Morgantown, West Virginia; Departments of Anatomy and Pediatrics, Tulane University Medical School; Charity Hospital of Louisiana at New Orleans; and the Department of Pathology, University of Michigan Medical Center, Ann Arbor, Michigan
Male twins first developed maculopapular eruption of the scalp at 9 months of age and then of other cutaneous areas during the next 3 months. They manifested otorrhea, anemia, and abdominal enlargement at 11 months. They had fever, massive hepatosplenomegaly, and moderate lymphadenopathy when admitted to the hospital at 12 months. There were histiocytes in the skin and bone marrow. The clinical impression of monozygosity was confirmed by several criteria.
One twin died at 15 months with diarrhea, and the other twin died at 21 months after developing scattered osteolytic lesions and diabetes insipidus. Autopsy findings in both twins were characteristic of acute disseminated histiocytosis X with diffuse infiltration of nonlipidic histiocytes. An unusual finding was extensive liver involvement in both twins.
Evidence for genetic determination of the disease consists of analysis of the literature reports in three categories. Twin studies show three of four pairs of monozygotic twins concordant for the trait. Sibship analysis of the familial occurrence by the a priori method with correction for multiple ascertainment is consistent with the genetic hypothesis. One consanguineous mating has been reported among the seven sibships of familial occurrence.
We conclude that at least some instances of this disease result from a single, autosomal, recessive gene with slightly reduced penetrance.
Submitted on June 3, 1969