The fine structure of a hormonal active granulosa cell tumour is described. The greater part of the tumour consisted of a cell type resembling the granulosa cell of the normal follicle. It contained many Golgi elements but was poor in smooth and rough endoplasmic reticulum. Another type of cell was found in the proximity of strands of connective tissue. The second type had large amounts of smooth endoplasmic reticulum and lipid droplets. This type is probably the thecal element and its ultrastructure indicates that it represents the endocrine active part of the tumour.
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Pedersen et al. (1970) studied this question.
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