Esophageal anatomical landmarks
For correct interpretation of radiographs, the zonal anatomy of the esophagus must be taken into account. The organ is conventionally divided into three segments, 8 cm each:
- Cervical and upper thoracic segments. Formed by striated muscle. Supplied by the inferior thyroid artery (a. thyroidea inferior). Innervation (including parasympathetic) is provided by the vagus nerve (n. vagus).
- Mid-thoracic segment. The muscular layer has a mixed structure. Supplied by branches of the aorta, venous drainage goes into the azygos vein system (v. azygos).
- Lower thoracic and abdominal segments. Represented by smooth muscle. Blood supply is provided by the left gastric artery (a. gastrica sinistra).
Normally, radiographs visualize physiological impressions from adjacent structures: the aortic arch, the left main bronchus, and the left atrium. Physiological narrowings are also distinguished, where foreign bodies are most frequently lodged: at the level of the cricopharyngeus muscle (m. cricopharyngeus), the aortic arch, the left main bronchus, and the esophageal hiatus of the diaphragm.
Contrast techniques
The choice of agent and technique depends on the clinical task. Barium suspension is the standard; however, in suspected perforation or anastomotic leakage, exclusively water-soluble contrasts are used.
- Double contrast. The patient ingests a gas-forming (effervescent) substance, followed by a dense barium suspension (100% w/v concentration). The examination is usually performed in a standing position. Gas expands the lumen, and barium coats the walls in a thin layer, which is critical for evaluating fine details of the mucosal membrane (gastric areae and folds).
- Single contrast. Used to assess organ distensibility, tight filling, and motility. Performed in a prone or supine position. Allows for recording peristaltic waves and tertiary (spastic) contractions.
Important: when using water-soluble contrast, low-osmolar agents must be chosen. High-osmolar agents can provoke pulmonary edema in case of accidental aspiration.
Gastric fluoroscopy: preparation and procedure
A comprehensive gastric examination requires preparation: 2–3 days before the procedure, a diet excluding gas-forming foods (legumes, fresh milk, cabbage) is prescribed, and the procedure itself is performed strictly on an empty stomach.
Anatomically, the stomach is divided into the cardia, fundus, body, antrum, and pylorus. The muscular layer of the stomach (muscularis propria) has three layers: the inner oblique, the middle circular (thickening at the pylorus to form the sphincter), and the outer longitudinal.
Principles of the examination:
- Multi-positional approach. The patient is rotated 360 degrees under fluoroscopic control. Changing projections and body positions allows for unfolding the folds, examining all sections, avoiding shadow overlapping effects, and identifying hidden defects.
- Evaluation of evacuation. The physician observes the passage of contrast through the esophagus, stomach filling, and its subsequent emptying into the duodenum.
- Targeted radiographs. Performed in areas of greatest interest (for example, upon detecting a filling defect or a niche).
Radiological signs of pathologies
Although endoscopy (EGD) is the first-line method today, fluoroscopy retains its significance in complex hernias, trauma, and as an alternative for debilitated patients.
Some characteristic signs on radiographs:
- Achalasia. A plain chest radiograph shows a dilated esophagus filled with fluid and gas (a horizontal fluid level is visible).
- Malignant stricture. During barium contrast imaging, the mucosa appears uneven, with characteristic "undermined" edges clearly demarcating the affected area from healthy tissue (a typical picture for squamous cell carcinoma).
The layers of the esophageal muscular coat from top to bottom are easily remembered by the S-M-S rule: Striated (cervical) → Mixed (mid-thoracic) → Smooth (lower thoracic).
Class and exam questions
Why can barium not be used when gastrointestinal perforation is suspected?
If barium suspension enters the peritoneal cavity, severe peritoneal fibrosis develops and barium granulomas form. In such cases, only water-soluble contrast is used.
What is the purpose of double contrast?
The combination of barium suspension and gas (from effervescent powder) allows the organ to be fully expanded and achieves a thin coating of the walls. This is necessary for a detailed study of the mucosal relief.
Why is the patient asked to change body positions during the examination?
This is the principle of the multi-positional approach. Changing positions allows the contrast to evenly coat all stomach walls, unfold the folds, and bring "blind" zones into profile, eliminating shadow summation.
What else to study on this topic
- Topography of gastric divisions and variants of its anatomical location
- Histological structure of the gastric walls and localization of secretory cells
- The role of endoscopy (EGD) and endoscopic ultrasound compared to fluoroscopy
- Application of water-load CT for staging GI tumors
- Evaluation of the esophagogastric junction and crura of the diaphragm
Master the entire topic in the "Diagnostic Radiology" course
This is a summary. The course covers everything tested in classes and exams.
- Complete WhiteCoat Pro study guide on "Barium Gastrointestinal X-ray Examination" and 2,199 more pages on the subject
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 10 video lessons on the subject
Other topics in the section "Diagnostic Radiology of the Abdominal Organs"
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.