Related Experiment Video
Updated: Jun 25, 2026

Preparation and Evaluation of 99mTc-labeled Tridentate Chelates for Pre-targeting Using Bioorthogonal Chemistry
Published on: February 4, 2017
Technetium and blood extravasation before gammagraphy: a case report
Sergio Vano-Galvan1, Cristina Rodriguez-Rey, Eliseo Vano-Galvan
1Dermatology Service, Ramon y Cajal Hospital, University of Alcala, Madrid, Spain. sergiovano@yahoo.es.
Background:
An 80-year-old woman presented with an abrupt onset of asymptomatic black-to-purple discoloration of her right limb that appeared just before a thyroid gammagraphy. No antecedent of trauma was found.
Case Presentation:
On questioning, patient admitted she did not cooperate during intravenous administration of Tc-99m-pertechnetate. Based on the abrupt onset of lesions and the absence of cooperation during intravenous administration of radiotracer, a suspect diagnosis of technetium and blood extravasation was made. This entity was confirmed in basis of evolution, with a spontaneous resolution of lesions within the next 15 days with no complications.
Conclusion:
Patient and physicians must be reassured because of the non-vesicant property of technetium. Recovery of this entity is spontaneous, and no treatment is needed.
Related Concept Videos
Imaging Studies II: Positron Emission Tomography and Scintigraphy
Fundamental Principles of PET
Imaging Studies III: Computed Tomography
Imaging Studies for Cardiovascular System V: CT
Radiological Investigation III: Pulmonary Angiogram and PET Scan
Pulmonary Angiogram
A Pulmonary Angiogram is an invasive procedure involving injecting a contrast medium through a catheter threaded into the pulmonary artery or the right side of the heart to visualize the pulmonary vasculature. Computed Tomography (CT) scans have mainly replaced this...
Imaging Studies I: CT and MRI
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
Radiological Investigation I: X-ray and CT

