Transmission electron microscopic study of the bizarre infiltrating cells from a case of lymphomatoid papulosis reveals intranuclear and intracytoplasmic virus-like particles. These cells have large nuclei with multiple nucleoli, scant to moderate profiles of rough endoplasmic reticulum, mitochondria and a variable number of lysosomes. It is suggested that these abnormal cells are macrophages showing viral cytopathogenic effects.
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