Dermatopathology
Primary cutaneous diffuse large B-cell lymphoma, leg type and secondary cutaneous involvement by testicular B-cell lymphoma share identical clinicopathological and immunophenotypical features

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Background

Primary cutaneous diffuse large B-cell lymphoma (PCDLBCL), leg type can eventually disseminate to extracutaneous sites including testes. In addition, patients with testicular lymphoma can develop specific skin involvement.

Objective

We sought to describe similarities between PCDLBCL, leg type and testicular B-cell lymphoma affecting the skin.

Methods

We report two cases with typical clinicopathological and immunophenotypical features of leg type lymphoma occurring simultaneously with a testicular B-cell lymphoma. We also report an additional case of PCDLBCL, leg type with secondary testicular involvement.

Results

All cases presented with typical red tumors exclusively located on the legs. Histologically, all cases showed a diffuse nonepidermotropic infiltrate composed of large blastic cells mainly centroblastic type. Phenotype showed strong positivity for Bcl-2, MUM-1, and FOXP1. Epstein-Barr virus stains and CD30 were negative in the 3 cases. In all cases the testicular infiltration showed the same pathological and phenotypical changes to those observed in the skin.

Limitations

This was a retrospective case series study.

Conclusion

Skin involvement by testicular B-cell lymphomas and PCDLBCL, leg type are indistinguishable on the basis of pathologic and immunophenotypical features, therefore specific investigation and clinic correlation are needed.

Section snippets

Case 1

A 77-year-old man was admitted to the hospital with cutaneous erythematous tumors on the left leg (Fig 1, A). No clinical or radiologic signs of extracutaneous involvement were detected at that time. Histologic examination of the skin biopsy specimen showed dense lymphocytic infiltrate of centroblasts (large cells with round or oval nuclei and several small nucleoli) and immunoblasts. An immunohistochemical analysis identified the tumor as a CD20+, and a combined expression of MUM-1, Bcl-2 and

Discussion

Primary testicular lymphoma is a rare neoplasm accounting for approximately 9% of testicular malignant tumors.7 It is usually observed in elderly patients as a unilateral painless scrotal swelling, sometimes with a significant increase in the size of one or both testes or hydrocele.8 Histopathologically, a diffuse large B-cell lymphoma is the most common subtype of primary testicular lymphoma, although more aggressive subtypes, such as Burkitt lymphoma, are more prevalent in cases of secondary

References (12)

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Funding sources: None.

Conflicts of interest: None declared.

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