[Diffuse cutaneous vasculitis disclosing acute lymphoblastic leukemia]

Area of Science:

• Pediatric Oncology
• Dermatology
• Hematology

Background:

• Generalized erythematous eruptions can present diagnostic challenges in children.
• Early diagnosis of hematologic malignancies is crucial for effective treatment.

Observation:

• A 4 1/2-year-old child developed widespread red rashes over four months.
• Skin biopsy revealed perivascular lymphoblasts and leukocytoclastic vasculitis.
• Leukocyte counts were initially normal, with few blasts detected only during biopsy.

Findings:

• The skin biopsy led to the diagnosis of acute lymphoblastic leukemia (ALL).
• Leukocytoclastic vasculitis, though uncommon, was observed in conjunction with ALL.
• The presence of blasts in the skin biopsy was a key diagnostic indicator.

Implications:

• This case underscores the importance of skin biopsy in evaluating unexplained rashes in children.
• It highlights an unusual cutaneous manifestation of acute lymphoblastic leukemia.
• Recognizing such presentations can improve diagnostic timelines for pediatric leukemia.