Systemic anaplastic large cell lymphoma presenting as a bladder neoplasm.

Area of Science:

• Oncology
• Pathology
• Urology

Background:

• Non-Hodgkin's lymphoma commonly affects the bladder, but specific subtypes like Anaplastic Large Cell Lymphoma (ALCL) have not been previously documented at this site.
• Systemic lymphomas can present with diverse symptoms, including those mimicking bladder disease, necessitating thorough diagnostic evaluation.

Observation:

• A case of systemic ALCL in a 22-year-old, HIV-negative male is presented, who exhibited multisystemic symptoms suggestive of bladder involvement.
• Bladder biopsy revealed a high-grade lymphoma characterized by large cells with prominent nucleoli, expressing CD30, CD45, EMA, and ALK-1.
• Lymph node biopsy confirmed similar pathological features, leading to a diagnosis of ALCL with a null cell phenotype.

Findings:

• This report documents the first instance of Anaplastic Large Cell Lymphoma involving the urinary bladder.
• Immunohistochemical analysis confirmed the tumor's identity, highlighting key markers (CD30, CD45, EMA, ALK-1) characteristic of ALCL.
• The patient achieved complete remission and remained disease-free for 33 months following treatment with the CHOP chemotherapy regimen.

Implications:

• This case expands the known spectrum of Non-Hodgkin's lymphoma involvement in the bladder.
• It underscores the importance of considering rare lymphoma subtypes in the differential diagnosis of bladder lesions, even in HIV-negative individuals.
• The successful treatment outcome suggests that standard chemotherapy regimens like CHOP may be effective for this rare presentation of ALCL.