Eosinophilia in systemic mastocytosis

Area of Science:

• Hematology
• Pathology

Background:

• Diagnosis of systemic mastocytosis relies on identifying mast cell infiltration in tissues.
• Accurate mast cell identification can be difficult without clinical suspicion.

Observation:

• Patients with atypical features and eosinophilia (blood/tissue) presented with findings mimicking myelofibrosis or lymphoma.
• Eosinophilia prompted further investigation, leading to the diagnosis of systemic mastocytosis.

Findings:

• Combined use of Wright-Giemsa stain, toluidine blue, and aminocaproate esterase is recommended for mast cell identification.
• Eosinophils show a close relationship with mast cells.

Implications:

• Systemic mastocytosis should be considered in cases of unexplained eosinophilia.
• Improved diagnostic methods are crucial for challenging cases.