Signet-Ring Cell Variant of Large Cell Lymphoma

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Abstract
A diffuse, large cell lymphoma of palatine tonsil was found to contain a considerable number of enlarged tumor cells with prominent, hyaline, Russell body-type cytoplasmic inclusions displacing the nucleus peripherally and, thus, the morphologic features of signet-ring cell lymphoma. Immunoperoxidase staining revealed that the contents of the signet-ring cells were strongly positive for μ heavy chains and κ light chains. Ultrastructurally, Russell body-type inclusions consisted of multiple, angulated, electron-dense crystalloids enclosed within expanded segments of rough endoplasmic reticulum.