CD30+ Primary Cutaneous Post-transplant Lymphoproliferative Disorder with Signet-ring Cell Features

We report a case of primary cutaneous CD30+ post-transplant lymphoproliferative disorder with an uncommon finding of signet ring cell features in a heart transplant patient. The neoplastic cells were CD4 and CD30 positive, and negative for S-100, pancytokeratin, myeloperoxidase, and CD56. In situ hybridization for Epstein Barr Virus (EBV) was negative, even though the patient did have EBV viremia.

Signet ring cell primary cutaneous CD30+ lymphoproliferative disorder presenting as a monomorphic T-cell posttransplant lymphoproliferative disease

T-cell posttransplant lymphoproliferative disorders are rare, with peripheral T-cell lymphoma not otherwise specified being the most common type. Although cases of the signet ring cell variant of primary cutaneous CD30+ lymphoproliferative disorder have been reported, such cases have not been described in the posttransplant setting. We describe a case with emphasis on the special contextual differential diagnostic considerations.