Pityriasis lichenoids chronica as a paraneoplastic dermatosis for primary splenic diffuse large B cell lymphoma.

Paraneoplastic dermatosis is defined as both benign skin lesions and internal malignancy existing at the same time with parallel clinical courses. Herein, we report a 91-year-old male who presented as pityriasis lichenoids chronica (PLC) concomitantly with a primary splenic diffuse large B cell lymphoma. Surgical removal of the spleen cleared his skin lesions dramatically. However, seven months later, the splenic lymphoma relapsed in concordance with the recurrence of the skin lesions of PLC. To our knowledge, he is the first case that PLC is the leading presentation and paraneoplastic manifestation of primary splenic large B-cell lymphoma.