A case of metastatic balloon cell melanoma is presented. The balloon cells are ultrastructurally characterized by the presence of numerous cytoplasmic vacuoles and abnormal melanosomes, which confirm their melanocytic origin. The study supports the concept that the cytoplasmic vacuoles represent grossly dilated melanosomes. The value of electron microscopic examination is emphasized in order to distinguish these lesions from other malignant clear cell tumors.
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Søndergaard et al. (1980) studied this question.
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