Radiology - Conditions (Subscribe)  

* elevated uric acid x-ray features:
* multiple, sharply marginated punched out erosions with sclerotic rims (assymetric in distribution unlike RA) sometimes associated with soft tissue masses representing tophi
* good bone denstity (unlike RA)
* "overhanging edge"...

Radiology case 439-208 Incidental finding in an immigrant now in the UK.
There is an irregular line of calcification in the soft tissues of the left middle finger on the palmar aspect of the proximal phalanx. It is typical of a parasite.

Radiology case 451-3143 There is bone lucency which is irregular, but bilateral. The other clue is the more distal position of the epiphyseal line in the left femur. The patient's pelvis is not tilted. The appearance is of increased length of the left femur. This implies increased vascularity. The epiphyses...

# There is an expansile lesion of the proximal left tibia. It extends to the subchondral surface. # Although cortical thinning is present, the lesion does not appear to have penetrated the cortex. # The lesion is geographic with a web or lattice-like configuration. # No soft tissue masses, unusual calcifications, or periostitis...

Radiology case 331-3141 The usual plain film of a middle aged adult with back pain. Effectively an incidental finding.
There is a coarsening of the bone texture with relative preservation of vertical trabecula in the body of the third lumbar vertebra. There is spondylotic change between L4 and L5 with disc...

* a/w racquet-sport injury
* best evaluated by CT

chronic diseminated form of histiocytosis X
* age 1 - 3 yrs most common
* skull and mandible lesions similar to EG, but more numerous
* "geographic skull", "floating teeth"
* adenopathy
* enlarged liver and spleen
* skin lesions
* diabetes insipidus
* exophthalmos
* lung disease

bilateral fracture of pedicles of axis (C2)

x-ray:
* slight loss of density of vertebral body
* vertically striped orientation of bone trabeculae ("corduroy cloth") which may extend into the pedicle
* occ. with posterior bulging
* cortical margins usually intact

* incidence: knees> elbows> ankles> hips> shoulders> wrists
* results in secondary OA (DDx: acromegaly, ochronosis, spondyloepiphyseal dysplasia, chronic trauma)
xray manifestations:
* premature closure of epiphysis leading to short bone with enlarged end
* "squared" patella (flattened inferiorly)
* widened intercondylar notch
* subchondral cysts
* severe osteopenia

* autosomal dominant
* M> F
* multiple exostoses
* "snowflake" calcification of mature cartilage cap
* may --> chondrosarcoma
* short metacarpals (esp. 4th + 5th)

Definition Most common of osteochondrodysplasias characterized by formation of multiple osteochondromas. Diagnostic Radiology/Musculoskeletal Imaging/Tumors Basic/Hereditary Multiple Exostoses From Wikibooks, the open-content textbooks collection

* usually posterior
o hip flexed, knee hits dashboard during deceleration
* superior migration of femoral head
* +/- acetabular fx

aka: Langerhans cell histiocytosis LCH
intense proliferation of reticulohistiocytic cells
* eosinophilic granuloma (EG)
o 60-80% of histiocytosis X
o age 5 - 10 yrs most common
...

Radiology case 48-342 Man aged 47yr with back pain and night sweats.
There is a low density area in the glenoid of the left scapula. It is irregular and not sharply defined. A more subtle zone of patchy loss of bone density lies in the posterior margin of the left 1st...