Primary cutaneous lymphomas are rare manifestations of extranodal lymphomas. Comprising the majority of cutaneous lymphoma cases with neoplastic B-cell origins, three main subtypes exist. In general, grossly and microscopically these subtypes are similar. However, these are three distinct variants with diverse clinicopathologic, cytogenetic, molecular, and prognostic features. Primary cutaneous diffuse large B-cell lymphoma, leg type is an exceedingly rare and aggressive variant of primary cutaneous B-cell lymphomas. Thus, increased clinical awareness is needed to differentiate between the three subtypes because earlier identification not only leads to the appropriate treatment, but also improved survival. Here, characteristic features of the three predominant variants of primary cutaneous B-cell lymphomas are presented while remaining focused on the most aggressive subtype- primary cutaneous diffuse large B-cell lymphoma, leg type.
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