Remember Mr CHONG is a chemistry professor carrying an Erlenmeyer Flask
C – Craniometaphyseal dysplasias
H – Hemoglobinopathies (Sickle cell, Thalassemia)
O – Osteopetrosis, Osteochondromatosis
N – Niemann-Pick
G – Gaucher disease
This page is the quick memory aid only. For the full reference, including the three types of Erlenmeyer flask deformity, all 20 reported causes, how often the sign is actually present in each disorder, and the measurement that separates it from normal metaphyseal flaring, see Erlenmeyer flask deformity: causes, types and how to measure it.
Note that CHONG covers the common causes but none of the craniotubular dysplasias beyond craniometaphyseal dysplasia. Frontometaphyseal dysplasia, which was the single most consistent association in the International Skeletal Dysplasia Registry, is not in it.
Check out more visual mnemonics here:
Tuberous Sclerosis – Visual Mnemonics
Causes Of Linitis Plastica – Visual Mnemonics
Ring Enhancing Lesions in Brain: Causes, MRI and Mnemonic
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