Marrow reticulin was studied by trephine biopsy in 44 patients with adult acute leukaemia at presentation and subsequently during the course of their illness. The findings indicate that: (1) an increase in marrow reticulin is common at presentation in patients with both acute lymphoblastic and acute non-lymphoblastic leukaemia; (2) effective anti-leukaemic therapy results in resolution of some or all of the increased marrow reticulin and is not contraindicated, even in patients with a marked increase in marrow reticulin; and (3) reappearance of an increase in marrow reticulin may be a sign of relapse of the leukaemia.

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