Precise Localization of Occult Gastrointestinal Hemorrhage Using Dynamic SPECT/CT

Area of Science:

• Nuclear medicine
• Gastroenterology
• Diagnostic imaging

Background:

• Intermittent gastrointestinal (GI) bleeding poses diagnostic challenges.
• Technetium-99m-labeled red blood cell (99mTc-RBC) scintigraphy is effective for detecting active GI bleeding.
• Localization of bleeding sources can be difficult with standard endoscopic evaluations.

Observation:

• A 48-year-old woman presented with active GI bleeding detected by 99mTc-RBC scintigraphy.
• Initial upper and lower GI evaluations did not identify the bleeding source.
• Repeat 99mTc-RBC scintigraphy revealed extravasation in the right lower quadrant.

Findings:

• Dynamic SPECT/CT imaging precisely localized the active bleeding to the ileocecal valve region.
• Surgical confirmation validated the SPECT/CT findings.
• SPECT/CT enhanced the diagnostic accuracy of scintigraphy for obscure GI bleeding.

Implications:

• Dynamic SPECT/CT imaging is a valuable tool for localizing intermittent GI bleeding when other methods fail.
• This technique can improve patient management and guide surgical interventions for obscure GI bleeding.
• Advanced nuclear imaging offers improved precision in diagnosing complex GI bleeding cases.