Pseudo-Gaucher cell in IgMk plasmacytoid lymphoma

Area of Science:

• Hematopathology
• Immunology
• Cell Biology

Background:

• Plasmacytoid lymphoma is a rare hematologic malignancy.
• Gaucher disease is a lysosomal storage disorder characterized by Gaucher cells.
• Distinguishing between similar-appearing cells is crucial for accurate diagnosis.

Observation:

• Lymph node imprints from a patient with plasmacytoid lymphoma revealed cells morphologically similar to Gaucher cells.
• These cells exhibited nonspecific esterase activity.
• Electron microscopy identified electron-dense, crystal-like structures within these cells.

Findings:

• The observed macrophages contained crystal-like inclusions, mimicking Gaucher cells.
• Associated plasma cells showed positivity for kappa and mu immunoglobulins.
• The crystal-like structures were hypothesized to be composed of altered immunoglobulin.

Implications:

• This finding highlights the importance of detailed ultrastructural analysis in differentiating lymphomatous cells from storage cells.
• Altered immunoglobulin can form crystalline inclusions, leading to misdiagnosis if not properly investigated.
• Understanding these cellular distinctions aids in accurate diagnosis and treatment of hematologic malignancies.