How to Revise Haematological and Lymphoid Imaging for the FRCR Part 2A

Haematology and lymphoid imaging has a reputation among trainees. It feels patchy, a bit niche, and easy to leave until last. Then a question on Ann Arbor staging or a tricky marrow signal pattern pops up in a mock and you wish you had given it more time.

The good news? This topic rewards a focused approach. It is not enormous, and a lot of the marks come back again and again. Let me show you how to tackle it without drowning.

Start with lymphoma, because the exam loves it

Lymphoma is the backbone of this module. If you get comfortable here, you have won most of the battle.

Focus your early sessions on:

Hodgkin versus non-Hodgkin patterns. Hodgkin tends to spread in a contiguous, orderly way through adjacent nodal groups. Non-Hodgkin is more unpredictable and more likely to involve extranodal sites. Know the typical demographics too.
Staging systems. The Ann Arbor system with its modern refinements (and the Lugano classification) comes up often. Understand what the stages mean, what the A and B suffixes signify, and why extranodal disease matters.
The role of PET-CT. Know when FDG PET-CT is used for staging and response assessment, and get familiar with the Deauville five-point scale for interpreting response. This is classic single best answer territory.

Do not forget the thoracic manifestations. A large anterior mediastinal mass in a young adult should make you think lymphoma, and you should be able to describe how it differs from a thymoma or germ cell tumour.

Nail the imaging appearances of nodal disease

Many questions boil down to recognising abnormal nodes and knowing what to measure.

Keep these in your head:

Short axis diameter thresholds for pathological nodes in different regions.
Patterns of nodal spread (retroperitoneal bulky disease, mesenteric involvement, the sandwich sign in mesenteric lymphoma).
Features that favour lymphoma over other causes of lymphadenopathy, such as homogeneous enhancement and the tendency to encase rather than invade vessels.

A quick question for you. When you see large retroperitoneal nodes lifting the aorta away from the spine, what comes to mind first? That floating aorta sign is a nice lymphoma clue worth remembering.

Get confident with marrow signal

Bone marrow trips people up because the normal appearance changes with age and the MRI sequences can feel confusing. Spend a dedicated session here.

Work through:

Normal red to yellow marrow conversion and the expected distribution in children versus adults.
Marrow infiltration patterns in leukaemia, lymphoma and myeloma. Know how diffuse infiltration behaves on T1, and why comparing marrow signal to adjacent muscle and discs is so useful.
Myeloma specifics. Learn the classic lytic lesions on radiographs and CT, the role of whole body MRI, and why a skeletal survey has largely been replaced by cross-sectional imaging.
Marrow reconversion in anaemia or marrow stress, and how it can mimic disease.

The T1 rule of thumb is gold. Normal adult marrow should be brighter than muscle and intervertebral discs on T1. If it is darker, something is replacing the fat. Keep that single idea and you will answer a surprising number of questions.

Do not neglect the spleen

The spleen quietly shows up in this module. Make sure you can handle:

Causes of splenomegaly and massive splenomegaly (myelofibrosis and chronic myeloid leukaemia are favourites).
Splenic involvement in lymphoma, which may be diffuse infiltration rather than discrete masses.
Sickle cell disease and the imaging of autosplenectomy, plus the wider skeletal and abdominal features.

Sickle cell is worth a mini revision block of its own. The bone infarcts, the H-shaped vertebrae, the dactylitis, the extramedullary haematopoiesis. It links beautifully across modules, so the effort pays off twice.

Build in the extramedullary and complication topics

These smaller areas are easy marks if you have seen them once:

Extramedullary haematopoiesis and its typical paraspinal appearance in chronic anaemias and thalassaemia.
Iron overload and the low signal it causes in the liver, spleen and marrow on MRI.
Treatment complications such as neutropenic colitis, invasive fungal infection in immunocompromised patients and post-transplant lymphoproliferative disorder.

That last group bridges into chest and abdominal imaging, which is exactly why examiners like them.

A simple revision plan that works

Here is a structure you can lift straight into your week:

Day one: Lymphoma types, staging and PET-CT. Read around Deauville.
Day two: Nodal appearances and distributions, with practice cases.
Day three: Marrow signal and myeloma.
Day four: Spleen, sickle cell and thalassaemia.
Day five: Complications and a mixed question set to tie it together.

Then keep testing yourself. Passive reading feels productive but fades fast. Active recall and question practice are what move marks.

This is where SmashRad earns its keep. You can drill haematology and lymphoid cases from its bank of more than 12,000 exam-style single best answer questions, each with a full explanation and a Radiopaedia link when you want to dig deeper. The separate Learning mode gives you bite-size recall questions, which are perfect for cementing facts like marrow conversion or node thresholds. The per-module performance tracking shows you whether your spleen knowledge is solid or whether you keep guessing on PET response, then points you at what to revise next.

Keep it in proportion

Do not let this module scare you. It is smaller than it looks, and the high yield facts repeat. Learn lymphoma properly, master the T1 marrow rule, be comfortable with the spleen and sickle cell, and you will handle most of what the exam throws at you.

Ready to put this into practice? You can start free on SmashRad with 40 sample questions, no card needed, and see how your haematology knowledge holds up under timed conditions. Good luck, you have got this.