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What condition causes a narrowing of the sphincter at the distal end of the stomach?

Which of the following describes a kidney stone?

The best and most complete survey study of the paranasal sinuses is obtained by use of what projection?

When the clavicle is being radiographed, which of the following statements are true? PA projection must always be used A central ray angle of 15-30 degrees cephalic is used for the PA axial projection The patient’s head should be turned towards the affected side AP projections may be used for patient comfort A central ray angle of 15-30 degrees caudal is used for the PA Axial projection

For a lateral projection of L5-S1, which of the following statements are true? The patient is in a lateral position The hips and knees are extended The image receptor is centered to the CR A cylinder cone may be used to reduce greatly the production of scatter radiation The central ray is centered on a coronal plane 2 inches posterior to the ASIS and 1.5 inches inferior of the iliac crest

What is a comminuted fracture of the ring of the atlas that involves both anterior and posterior arches and causing displacement of the fragments?

What is lung cancer arising from bronchial mucosa?

For radiography of the sternoclavicular articulations:

What is the structure labeled #4 in the image shown below?  

When a lateral knee projection is performed, which of the following statements is true? The patient turns onto the affected side The knee is flexed 20-30 degrees The patella must be parallel to the image receptor The central ray is directed 5-7 degrees caudal The central ray enters the knee joint inferior to the medial epicondyle