A CD30-Positive Variant of Intravascular Large B-cell Lymphoma Presenting as Diffuse Interstitial Lung Disease and Generalized Lymphadenopathy: A Case Report

Lei Wang¹Yongdeng Cai¹Mengyao Wang¹Cui Gao¹Jianni Zhu¹Guangwei Xue¹Zheng Dong²Changsheng Ge^1*Wei Zhang¹Zongfang Li¹Zongtao Liu¹Yunqing Chen³Cailing Du¹Changjiang Li¹Yajing Liang¹Lu Wang¹Baomin Mi¹

• ¹Rizhao Hospital of Traditional Chinese Medicine, Rizhao, China
• ²Linyi Central Hospital, Linyi, China
• ³The Affiliated Hospital of Qingdao University, Qingdao, China

ABSTRACT Intravascular large B-cell lymphoma (IVLBCL) is a rare and aggressive malignancy defined by the proliferation of neoplastic B-cells within the vascular lumen. While the disease can affect multiple organs, commonly manifesting as skin lesions, neurological deficits, or hepatosplenomegaly, it usually spares the lymph nodes and rarely presents as diffuse interstitial lung disease (DILD). We report a 62-year-old man admitted with recurrent fever and progressive dyspnea. Chest computed tomography revealed extensive bilateral interstitial lung disease, with ultrasonography showing generalized lymphadenopathy with preserved architecture. Although initial therapy led to a favorable response, the patient subsequently relapsed. Lymph node biopsy confirmed IVLBCL, characterized by intravascular and intrasinusoidal lymphoma cell infiltration with well-preserved nodal architecture. Notably, the tumor cells showed diffuse strong CD30 expression (~70%), a rare finding potentially linked to the unusual clinical presentation. Conclusion: This case demonstrates that IVLBCL can present with diffuse interstitial lung disease and generalized lymphadenopathy, expanding its recognized phenotypic spectrum. It may represent a variant with CD30-mediated nodal homing and immune activation.