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A 28-year-old male presents with a head injury after a motor vehicle accident. CT head shows a biconvex, hyperdense collection that does not cross suture lines.

A 3-month-old with a barking cough and stridor. Neck X-ray shows subglottic narrowing and the 'steeple sign'.

A previously healthy 30-year-old male presents with acute chest pain and dyspnea. CT Pulmonary Angiogram shows a filling defect in the bilateral pulmonary arteries.

A 45-year-old female with a history of chronic alcohol abuse presents with abdominal pain. Ultrasound shows a hyperechoic pancreas with shadowing suggestive of calcifications.

A 55-year-old male with a long history of hypertension and a recent stroke presents for a follow-up. CT scan shows an area of low attenuation in the left basal ganglia.

A middle-aged female presents with difficulty swallowing and regurgitation of undigested food. Barium swallow shows a dilated esophagus with a 'corkscrew' appearance.

A newborn with a history of difficult delivery presents with an asymmetric crying face. Ultrasound shows absence of bone continuity in the clavicle.

A 50-year-old female with a history of cirrhosis presents with a palpable abdominal mass. CT shows an enhancing lesion within the liver with a central scar.

A 35-year-old female presents with acute lower abdominal pain. Pelvic ultrasound reveals a complex adnexal mass with internal echoes and septations.

A 48-year-old male presents with epigastric pain after a heavy meal. Ultrasound shows gallbladder wall thickening and stones within the gallbladder.

A 7-year-old child presents with a limp and pain in the thigh. X-ray of the hip shows a subcapital fracture of the femur with displacement.

A 30-year-old female with a history of severe headaches. MRI shows a suprasellar mass with a 'snowman' or 'figure-of-eight' configuration.

A 22-year-old female with no significant past medical history presents with sudden onset of hemiparesis. MRI brain shows multiple periventricular white matter lesions with an 'open ring' enhancement pattern.

A 45-year-old male presents with episodic headaches and profuse sweating. MRI shows a small, homogeneously enhancing lesion on the adrenal gland.

A 60-year-old female with diabetes presents with vision changes. Fundus photography shows dot-blot hemorrhages, microaneurysms, and neovascularization.

A 50-year-old male presents with severe abdominal pain radiating to the back. CT abdomen shows an enlarged pancreas with peripancreatic fluid.

A 30-year-old male with dull flank pain and hematuria. CT abdomen shows a 'bear claw' sign within the kidney.

A 65-year-old male presents with progressive dysphagia to solids and liquids. Barium swallow shows a dilated esophagus with a 'bird-beak' tapering at the gastroesophageal junction.

A 32-year-old female presents with lower abdominal pain and vaginal bleeding. Transvaginal ultrasound shows a gestational sac with no fetal heartbeat outside the uterine cavity.

A 21-year-old female presents with sudden right lower quadrant abdominal pain. Ultrasound shows a complex mass in the right adnexa with blood flow around it but not through it.

A 55-year-old male with recent onset of severe headache and photophobia. CT head shows a diffuse hyperdensity in the subarachnoid space.

A 30-year-old female presents with classic signs of a urinary tract infection. Ultrasound of the kidneys show hydronephrosis and a distal ureteric stone.

A new mother presents with a swollen, red, and painful breast. Ultrasound shows a well-circumscribed fluid collection within the breast tissue.

An 80-year-old male with acute onset of aphasia and right-sided weakness. CT head shows a hyperdense artery sign.

A 40-year-old male with worsening chronic back pain. X-ray shows bony overgrowth at the intervertebral disc space and ossification within the disc.

A 20-year-old female presents with fever, arthralgia, and a rash on her face. Antinuclear antibody test is positive. Facial MRI shows soft tissue swelling without bony destruction.

A 35-year-old female presents with palpitations and heat intolerance. Nuclear medicine thyroid scan shows an area of increased uptake.

A 45-year-old male with a sudden onset of right-sided flank pain and hematuria. Non-contrast CT shows a hyperdense renal lesion without enhancement.

A 23-year-old female with irregular menses and hirsutism. Pelvic ultrasound shows enlarged ovaries with a 'string of pearls' appearance.

A 40-year-old male with a history of intravenous drug use presents with fever and back pain. MRI shows a poorly defined disc space with adjacent vertebral endplate disruption.

A 70-year-old male presents with progressive memory loss. MRI shows bilateral medial temporal lobe atrophy.

A 60-year-old smoker presents with hemoptysis and weight loss. Chest CT shows a central mass with cavitation in the right upper lobe.

An elderly female presents with acute hip pain after a fall. X-ray shows a fracture of the femoral neck with minimal displacement.

A 60-year-old female with a history of breast cancer presents with back pain. MRI reveals a vertebral lesion with a 'pedunculated' appearance.

An 8-year-old child with nocturnal enuresis. Renal ultrasound shows bilateral hydronephrosis and a thickened bladder wall.

A 35-year-old female presents with a non-productive cough and dyspnea. High-resolution CT shows bilateral interstitial lung disease with 'honeycombing' pattern.

A 25-year-old male complains of sudden onset of shortness of breath. Chest X-ray reveals a collapsed right lung with visible pleural line and no lung markings laterally.

An 18-year-old male with sudden onset testicular pain. Ultrasound shows heterogeneous echotexture of the testicle with reduced blood flow.