Pancytopenia and marrow infiltration: Viva

This is a branching oral built to probe the reasoning that holds the empty-versus-full marrow distinction at the centre, and to expose the candidate who has memorised the headline without the corners. The questions escalate from the framing to the stabilisation, the diagnosis, and the definitive management, with deliberate probes into the pitfalls. ^[3]

Opening question: framing the problem

The examiner opens with the film and the count and asks: how do you frame this problem in a single sentence, and what is your first priority? ^[1]

A strong answer names pancytopenia, the fall in all three lineages, and states that the first decision is whether the marrow is empty (failure) or full (infiltration). The circulating blasts with organomegaly settle the direction here: this is a marrow malignancy until proven otherwise. The first priority is the resuscitation of the unstable elements, because a child with a haemoglobin of 62, a neutrophil count of 0.4, and a fever is at risk of bleeding, infection, and the oncologic emergencies. ^[12]

Model answer. This child has pancytopenia with circulating blasts, which is acute leukaemia with marrow infiltration until proven otherwise. My first priority is to resuscitate the dangerous elements, the anaemia, the bleeding risk, the neutropenic fever, and the tumour lysis risk, and then to confirm the diagnosis with an urgent bone marrow aspirate and trephine biopsy in a specialist centre. ^[3]

Probe one: the resuscitation

The examiner presses: tell me exactly what you do in the first four hours, and why you choose those blood products. ^[12]