The mnemonic
MERLiN
What each word stands for
- MMedulloblastoma
- EEwing sarcoma
- RRhabdomyosarcoma
- LLymphoma
- NNeuroblastoma
Why it matters clinically
Gives the differential when biopsy shows sheets of primitive small blue cells; immunohistochemistry then separates them.
Where it stops being reliable
Wilms tumour and retinoblastoma are also small blue cell tumours and are not in the list.
Teaching aid, still awaiting independent review. Confirm facts in a standard source.