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Bat Wing Appearance-AKA Angel Wing-pattern of pulmonary edema which involves perihilar regions and spares cortex of lung |
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Berry Aneurysm-an intracranial aneurysm most often occurring in the Circle of Willis, particularly at the junction of major vessels in the anterior circulation |
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Blade of Grass Sign-AKA flame sign; advancing, wedge-shaped, osteolytic margin of active Paget disease of bone; usually seen in diaphysis |
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Beveled Edge Appearance-asymmetric erosion of the inner and outer tables of the skull usually seen with eosinophilic granuloma |
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Bird's Beak Sign-AKA Rat-tail Sign; irregularly marginated tapering of esophagus in achalasia |
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Bowler Hat Sign-cup-shaped filling defect seen on air contrast BE that represents polyp if it points toward lumen and tic if it points away |
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Black Pleural Line-paradoxical appearance of pleura in pulmonary microlithiasis because of innumerable dense calcifications in adjacent lung |
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Bird of Prey Sign-tapered barium column in sigmoid volvulus; Bird's beak sign in achalasia |
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Boot-shaped Heart-shape of heart in Tetralogy of Fallot due to upturned apex from RVH and concave pulmonary artery segment |
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Bowtie Appearance-of facets in the cervical spine on lateral view in unilateral rotatory subluxation at and above the site of rotation |
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Bamboo Spine-undulating contour of spine caused by bridging syndesmophytes seen in ankylosing spondylitis |
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Bucket Handle Tear-vertical tear in knee of mostly medial meniscus with displacement of fragment toward notch |
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Butterfly Vertebra-congenital sagittal cleft through center of vertebra with funnel-shaped ends on AP view of spine |
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Bone-within-a-Bone-inner layer of cortical new bone within an existing bone seen with osteopetrosis, Sickle Cell Dz, Thorotrast |
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Breast-within-a-Breast-in fibroadenolipoma
/hamartoma of breast; benign proliferation of normal breast components – fibrous, glandular, and fatty tissues – are surrounded by a thin capsule of connective tissue |
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Bear Paw Sign-dilated renal calyces with normal renal pelvis seen in calculus disease and xanthogranulomatous pyelonephritis |
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Boutonniere Deformity-hyperextension of distal interphalangeal joint and flexion of proximal interphalangeal joint in RA |
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Brim Sign-thickening of the iliopectineal line (pelvic brim) in Paget's disease |
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Boomerang Sign-hyperintense signal in the splenium of the corpus callosum accompanying stroke; also an MRI sign in peroneus brevis split syndrome |
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Box-shaped Heart-squared-off appearance of the heart in Ebstein's Anomaly due to large right atrium and dilated right ventricular outflow tract |
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Bite Sign-MSK-gouged-out defect due to collapse of bone in head of femur in avascular necrosis |
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Bulging Fissure Sign-bulging of usually minor fissure from heavy,exudative pneumonia like Klebsiella |
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Banana Sign-abnormal shape of the cerebellum from compression seen on MRI or antenatal US in spina bifida and other neural tube defects |
