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Wall of the cyst with extended infiltration from a malignant epithelial tumour (lower part of the figure). A remnant of squamous cell epithelium and of lymphadenoid tissue is recognized (upper part of the figure) (H & E [X 25]).

Wall of the cyst with extended infiltration from a malignant epithelial tumour (lower part of the figure). A remnant of squamous cell epithelium and of lymphadenoid tissue is recognized (upper part of the figure) (H & E [X 25]).