A 58-year-old Indian male presents with a 5-year history of pruritic erythematous scaly patches on his buttocks, lower abdomen, and medial thighs that have been misdiagnosed as eczema. Skin biopsy reveals atypical cerebriform lymphocytes with epidermotropism and Pautrier microabscesses; immunophenotype shows CD3+ CD4+ CD8− CD45RO+ cells with loss of CD7. The distribution pattern shown as **A** in the diagram is characteristic of which stage of mycosis fungoides?
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