What popular mnemonic is helpful in remembering bubbly bone lesions?
FEGNOMASHIC (or FOG MACHINES). F : fibrous dysplasia OR fibrous cortical defect (FCD); E : enchondroma OR eosinophilic granuloma (EG); G : giant cell tumour (GCT); N : non-ossifying fibroma (NOS); O : osteoblastoma; M : metastasis(es); A : aneurysmal bone cyst (ABC); S : simple (unicameral) bone cyst; H : hyperparathyroidism (brown tumour); I : infection (osteomyelitis); C : chondroblastoma OR chondromyxoid fibroma;
What is the differential in this case?
Non-ossifying fibroma, osteoblastoma, aneurysmal bone cyst, unicameral bone cyst, chondromyxoid fibroma.
X-rays of the distal femur demonstrate an expansile lucent lesion with a thin zone of transition and no internal mineralisation. There is no periosteal reaction or evidence of cortical breach or soft tissue mass. It is approximately 3cm proximal to the growth plate, which remains open.