radiology imaging medicine ct mri radstudent medstudent diagnosis diagnostic imaging x ray medical imaging ultrasound urinoma whirlpool sign brida beak sign disida echogenic cord bilious vomiting nec necrotizing enterocolitis premature absent gall bladder neonatal jaundice pneumoperitoneum pneumatosis feeding intolerance choledochal cyst caroli disease todani pancreaticobiliary maljunction choledochocele cholangiocarcinoma central dot sign biliary atresia small bowel obstruction renal trauma kidney multiphase ct active bleeding pseudoaneurysm hematoma uterus leiomyoma leiomyomatosis krukenberg signet ring cell metastases adnexal torsion ovarian torsion thoracic neuroblastoma mibg scan rib splaying foreign body aspiration expiratory film recurrent pneumonia air trapping chest xray malrotation volvulus cam type pincer type acetabulum fracture child abuse metaphyseal corner fracture paraganglioma glomus tympanicum malformation cystic hygroma thyroid cancer tirads rhinosinusitis neurology optic nerve vision loss mucocele angiofibroma epistaxis angiography imaging findings medschool learning education hepatoblastoma afp wilms tumor nephroblastoma venous invasion claw sign nephroblastomatosis posterior urethral valve keyhole sign voiding cystourethrogram bladder obstruction megaureter hydronephrosis meckel diverticulum omphalomesenteric duct ectopic gastric mucosa intussusception target sign gi bleeding ovarian cyst functional cyst radiograph hip impingement coxa magna acetabular retroversion
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