Radiology - Signs (Subscribe)  

a gap between the scaphoid and the lunate bones suggesting a rupture of the scapho-lunate ligament
seen on x-ray, CT and MRI of the wrist
Terry Thomas was a British actor whose career was most active in the sixties.
the reference is to the prominant gap between his front teeth
many radiologists have taken...

The teardrop sign, which can be seen on the standard lateral radiograph of the ankle in the neutral position, is useful in diagnosing ankle effusions of 5 mL or larger.
The ankle teardrop sign. Dodge JP. Radiology. 2004 Jun;231(3):789-90. Full text

anterior bowing
* OI
* hypophosphatasia
* thanatophoric dwarfism
* neurofibromatosis --> if fractured, doesn't heal normally
posterior bowing
* often bilateral
* d/t fetal malposition
* fracture will heal normally

juvenile rheumatoid arthritis
sickle-cell disease
hemophilia

lucent band in metaphysis beneath white line of Frankel
seen in scurvy

seen in rheumatoid arthritis
related to:
* triangular fibrocartilage
* prestyloid recess (of joint space)
* extensor carpi ulnaris tendon

ulna minus variance
* ulna shorter than radius
* increased frequency of AVN of lunate
* associated with DISI
ulna plus variance
* ulna longer than radius
* increased stress on triangular fibrocartilage

aortic coarctation
* proximal to left subclavian artery ==> RIGHT
* anomalous right subclavian artery ==> LEFT
subclavian artery stenosis / atresia
* ==> IPSILATERAL
* Blalock-Taussig shunt
anastamosis of subclavian artery to pulmonary artery for Tetralogy of Fallot
* ==> IPSILATERAL

"Calve-Kummel-Verneuil disease", "vertebral osteochondrosis" avascular necrosis of vertebral body age: 2-15 years
X-ray:
* uniform collapse of vertebral body into flat thin disc
* increased density of verbra
* neural arches not affected
* disc spaces are normal with normal intervertebral disc space
* intervertebral vacuum cleft sign (pathognomonic)
* no kyphosis
mnemonic: "FETISH"
* fracture
* eosinophilic granuloma
* tumor
* infection
* steroids
* hemangioma

dense zone of provisional calcification at edge of metaphysis, just beneath physis
seen in scurvy

dense rim of demineralized epiphysis
seen in scurvy

bilateral metaphyseal destruction in upper medial tibias
* congenital syphilis
less likely:
* bacterial osteomyelitis
* hamartomosis
* hyperparathyroidism

small ossicles within cranial suture lines
* osteogenesis imperfecta
* cleidocranial dysostosis
* cretinism
* idiopathic
* Down syndrome
* hypophosphatasia
* Menkes kinky-hair syndrome
* progeria
* pyknodysostosis

PORK CHOPS
P - pyknodysostosis
O - osteogenesis imperfecta
R - rickets in healing phase
K - kinky hair syndrome

C - cleidocranial dysplasia
H - hypothyroidism / hypophosphatasia
O - otopalatodigital syndrome
P - primary acro-osteolysis (Hadju-Cheney) / pachydermoperiostosis
S - syndrome of Down