Trichilemmal Cysts

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Abstract
Recently experienced cases of trichilemmal cysts [in a 60 yr old Japanese man] were studied by EM and light microscopy. Although ultrastructural findings in the present case were basically consistent with those reported in the literature, they were in contrast to them in some important respects. A few, oval and small-sized keratohyalin and a large number of membrane-coating granules were observed in the cytoplasm of keratinizing cells beneath the keratinizing cells and the junctional structure between the keratinized cells and the keratinizing cells beneath them showed interdigitation. Apparently trichilemmal cysts have close similarities to and might be derived from the trichilemmal sac surrounding the lower end of the catagen or telogen hair.