Animal and animal produce inspired signs
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Animal and animal produce inspired signs may sound a little silly, but the radiology literature is replete with signs, some more fanciful than others.
Fish and seafood
- fish vertebra (also known as codfish vertebra): biconcave vertebrae as seen in osteoporosis
- fishtail deformity of the elbow: due to abnormal trochlear ossification following a distal humeral fracture in childhood
- vertebral scalloping: may be anterior or posterior border
- endosteal scalloping: medullary cavity masses, e.g multiple myeloma
- lobster claw sign: of papillary necrosis
- manta ray sign: of bladder exstrophy
Poultry and fowl
- eggshell calcification: silicosis and occasionally sarcoidosis
- swan neck deformity: of rheumatoid arthritis
- bird-beak sign: achalasia (also known as rat tail sign)
- beak sign: of arterial dissection or of sigmoid volvulus
- gull wing appearance: erosive osteoarthritis
- hummingbird sign or penguin sign
- the winking owl sign
Domesticated and wild animals
- bull's eye: many of these
- staghorn calculus: struvite renal calculi
- feline oesophagus: horizontal striations seen on barium swallows as a variant of normal.
- eye of tiger sign: classical of Hallervorden-Spatz syndrome
- pleural mouse
-
panda sign
- of the midbrain: Wilson disease
- of sarcoidosis
- bear's paw sign: xanthogranulomatous pyelonephritis
- scotty dog sign
- hidebound sign: gastrointestinal scleroderma
- dural tail: of meningioma, don't know tail of which animal though
-
rat tail sign:
achalasiaof arterial dissection or of achalasia (also known as bird-beak sign) - rat bite erosions of gout
- bat's wing: pulmonary opacities and 4th ventricle (Joubert anomaly and related syndromes)
- anteater nose sign: calcaneonavicular coalition
- tigroid pattern or leopard skin sign
- moose head appearance
- snake eyes: appearance of facial canal in the petrous temporal bone
Insects and bugs
- butterfly glioma: nothing "oooh... isn't it pretty" about this one
- butterfly shape of the grey matter of the spinal cord
- butterfly fracture
- butterfly vertebra
Reptiles
Mythical creatures
- cyclops lesion: usually post ACL repair
- medusa head: of a developmental venous anomaly (DVA) also a sign of severe portal hypertension
Processed animal product containing foods
- cervical hamburger sign: normal cervical facet joints on axial CT
- honeycomb lung: UIP/pulmonary fibrosis
- mesenteric hamburger sign: mesenteric lymph node enlargement
- omental cake: metastases to omentum
- sausage digit: underlying inflammatory arthritis or dactylitis
- head cheese sign: hypersensitivity pneumonitis
- leather bottle stomach: of linitis plastica (or water bottle sign)
-<a href="/articles/rat-tail-sign">rat tail sign</a>: achalasia (also known as <a href="/articles/bird-beak-sign">bird-beak sign</a>)</li>- +<a href="/articles/rat-tail-sign">rat tail sign</a>: of <a href="/articles/arterial-dissection">arterial dissection</a> or of achalasia (also known as <a href="/articles/bird-beak-sign">bird-beak sign</a>)</li>