DDx

Question 1

Tibiotalar slant

Answer 1

Trauma, Infx, JRA, hemophilia, Sickle Cell, Epiph/Metaph dysplasia, NF1, FD, HME

Question 2

Bilat Symm sacroilitis

Answer 2

AS, PsA, ReactiveA, OCI, HyperPT, Gout, OA

Question 3

Bilat Asymm sacroiliitis

Answer 3

PsA, ReactiveA, Gout, OA

Question 4

Unilat sacroiliitis

Answer 4

PsA, Reactive, RA, Gout, OA, Infx

Question 5

Tumoral calcinosis

Answer 5

PSS, Renal Osteodystrophy, Milk-Alkali, HyperVitD

Question 6

Tuft resorption

Answer 6

PSS, HyperPT, Thermal inj (burn/frostbite), CollVascDz, PsA, Epidermolysis bollosa, PVC exp, Hadju-Cheney

Question 7

Band like resorption

Answer 7

Familial osteolysis, occupational osteolysis, CollVascDz, HyperPT

Question 8

Deforming Non-Erosive Arthropathy

Answer 8

Rheumatic Fever, CollVasc Dz (SLE), RA, agammaglobulinemia, Ehlers-Danlos

Question 9

Disc Ca2+

Answer 9

Ochronosis, hemochromatosis, CPPD, HyperPT, polio, acromegaly, amyloid, surgical fusion, AS, JCA

Question 10

DISH

Answer 10

postop heterotopic oss, acromegaly, AS, HyperVitA, Ochronosis, Fluorosis, HypoPT

Question 11

Gout

Answer 11

Sarcoid, amyloid, xanthomatosis

Question 12

Chondrocalcinosis

Answer 12

WHIPADOG: Wilsons, HyperPT, Idiopathic, Pyrophosphate arthropathy, Acromegaly/Amyloid, Diabetes , Ochronosis, Gout

Question 13

Metastatic Ca2+

Answer 13

Renal osteodystrophy, HyperPT, Sarcoid, HyperVitD, Milk-Alkali

Question 14

PeriArt Ca2+

Answer 14

calcific tendinosis/bursitis, CollVascDz, HyperPT, Renal osteodystrophy, HypoPT, Hyper VitD, Milk-Alkali, Idiopathic tumoral calcinosis, Articular disorders(gout, infx, CPPD) Sarcoid

Question 15

Rib Notching

Answer 15

RA, SLE, PSS, NF1, aortic coarctation

Question 16

Regional osteoporosis

Answer 16

Immobilization, disuse, RSDS/CRPS, transient reg. osteoporosis, transient osteoporosis of hip, regional migratory osteoporosis, transient bone marrow edema

Question 17

Post scalloped vert body

Answer 17

inc. intraspinal pressure(neoplasm, cyst, syrinx, hydrocephalus), dural ectasia (marfan, ED, NF1), Bone resorption (acromegaly), Congenital (achondroplasia, Morquio, Hurler), Physiologic scalloping

Question 18

Neuropathic joint

Answer 18

syphilis, syrinx, meningomyelocele, trauma, MS, Charcot-Marie Tooth, vascular, cord comp, DM, alcoholism, infx, pernicious, steroids, congenital indifference to pain

Question 19

Bony fragment

Answer 19

AVN, post-traumatic OA, intra-art steroids, neglected infx, ochronosis

Question 20

Acral osteolysis

Answer 20

CollVascDz, epidermolysis bullosa, neuropathic, HyperPT, sarcoid, PsA

Question 21

Metaphyseal lines

Answer 21

stress lines, heavy metal, leukemia, rickets, scurvy, Hypothyroidism, HypoPT, Hypervitaminoses, transplacental (TORCH) infx

Question 22

Metaphyseal flaring

Answer 22

lead poisoning, anemias, storage disorders, congenital syndromes, normal variant

Question 23

H-shaped vert

Answer 23

SCA, Thalassemia, Gaucher, congenital, hereditary spherocytosis, osteoporosis

Question 24

Widespread osteolysis

Answer 24

Macroglobulinemia, leukemia, histiocytosis, Gaucher, Vascular tumors, Infx, FD, HyperPT, Pancreatitis,

Question 25

Diffuse sclerosis

Answer 25

Osteoblastic mets, SCA, Paget, FD, lymphoma, mastocytosis, tuberous sclerosis, renal osteodystrophy, sarcoidosis

Question 26

Erlenmeyer Flask

Answer 26

Gaucher, Niemann-Pick, Anemia, FD, Metaphyseal dysplasia (Pyle’s), osteopetrosis, heavy metal (lead)

Question 27

Demineralizing arthritis

Answer 27

Hemophilia, osteomyelitis, RA, Reiter/reactive, Scleroderma, Erythomatosis (HORSE)

Question 28

Carpal erosions

Answer 28

Gout, CRPS, RA, Trauma

Question 29

Protrusio acetabuli

Answer 29

MyPROTRUSIO: Marfan, Paget/Psoriatic/Primary, RA, Osteogenesis imperfecta, Trauma/Tumor, Rickets, Unkn (idiopathic), Sickle cell anemia (rare), Inflammatory arthritis, Osteomalacia