Gastric polyp

Case contributed by Dr Matt A. Morgan

Presentation

Patient presents with nausea, abdominal pain, fever, and diarrhea. Small bowel follow through performed.

Patient Data

Age: 20 years
Gender: Female
Fluoroscopy

Small bowel follow through - Upper GI component

There is a 7 mm polyp along the greater curvature of the stomach. There is also a 1.5 - 2 cm polypoid lesion along the distal lesser curvature with a relatively smooth surface.

Annotated image

Annotated images

The arrows indicate the polyps. Note how with different angles and amounts of contrast can obscure the larger lesser curvature polyp!

Photo

Upper endoscopy shows both polyps.

Case Discussion

This case demonstrates how polyps can change their appearance on fluoroscopy depending on the technique used. It's also meant to show the strength and weakness of "pseudo-double contrast" technique ("pseudo-double contrast" instead of "double contrast" because no effervescent agent was administered and because the barium is lower density than that used with double contrast).

On the initial single contrast views the smaller polyp is easier to see given its location and given its shape which sticks out more into the lumen than the larger polyp. On earlier views this polyp was less visible because the stomach was over-filled with contrast, obscuring it (on some of the earliest images (not shown) it's invisible!). As the contrast transits into the duodenum, the greater curvature polyp becomes more visible as the antral contrast pool becomes less dense. When most of the contrast had moved through the stomach, allowing a "pseudo-double contrast" view of retained swallowed air and residual contrast, then the greater curvature polyp became even more visible with almost a "bowler hat" appearance. 

The larger, flatter polyp is, interestingly, harder to see than the smaller polyp. One sees it better in profile on the single contrast images, but when the stomach rotates into a different plane, bringing the polyp en face on the dependent surface, then it becomes very difficult to see with either technique.

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Case information

rID: 64772
Published: 7th Dec 2018
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included
Institution: University of Pennsylvania

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