Relapsed Gray Zone Lymphoma: A Rare Clinical Challenge.

Area of Science:

• Hematology
• Oncology
• Pathology

Background:

• Gray zone lymphoma (GZL) is a rare hematological malignancy with overlapping features of classical Hodgkin's lymphoma (HL) and diffuse large B-cell lymphoma.
• Distinguishing GZL from HL can be challenging, particularly in cases with late-stage or atypical presentations.

Observation:

• A 22-year-old male initially presented with classical Hodgkin's lymphoma.
• The lymphoma transformed into relapsed or refractory gray zone lymphoma, exhibiting characteristics of both HL and diffuse large B-cell lymphoma.
• The patient experienced two disease relapses, persisting even after undergoing peripheral blood stem cell transplantation.

Findings:

• Initial biopsies suggested classical HL, but later biopsies during disease progression indicated GZL.
• The case highlights the diagnostic complexity and aggressive nature of GZL, especially in its transformed state.
• Despite a multi-modal treatment approach including chemotherapy, radiation therapy, and immunotherapy, the disease proved refractory.

Implications:

• This case underscores the importance of thorough pathological evaluation and re-biopsy in managing challenging lymphoma cases.
• Understanding the transition from HL to GZL may inform future diagnostic criteria and therapeutic strategies for these rare lymphomas.
• Further research into the molecular mechanisms driving this transformation is warranted to improve patient outcomes.