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USMLE (United States Medical Licensing Examination): Step 1: Basic sciences assessment Practice Exam 09

Practice exam for USMLE (United States Medical Licensing Examination): Step 1: Basic sciences assessment.

Active sessionUSMLE Step 1 practice testUSMLE Step 1 practice examUSMLE Step 1 practice questionsUSMLE Step 1 basic sciencesUSMLE Step 1 foundational sciences+5
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Question 1 of 1000%
Time remaining120:00
Attempts allowedUnlimited
Difficulty mixE • M • H
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Question 1

MEDIUM

A 2-day-old boy in the neonatal intensive care unit has excessive salivation and coughing with attempted feeds. Pregnancy was uncomplicated. Physical examination shows mild abdominal distention. A nasogastric tube cannot be advanced into the stomach. A chest radiograph shows the tube coiled in the upper mediastinum with air in the stomach and intestines. Which of the following embryologic errors most likely explains this patient's condition?

The inability to pass an NG tube with coiling plus air in the GI tract indicates esophageal atresia with a distal tracheoesophageal fistula. This results from incomplete separation of the foregut into trachea and esophagus by the tracheoesophageal septum. Neural crest migration failure causes Hirschsprung disease; vitelline duct persistence causes Meckel diverticulum.

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