Yellow 560 Microscope for Intraoperative Visualization of Fluorescein Stained Intracranial Lesions

Study Purpose

This study focuses on implementing Yellow 560 for the direct intraoperative visualization of Fluorescein Sodium stained intracranial lesions to facilitate extend of surgery, develop better treatment protocols, and improve the prognosis of a wide array of neurosurgical diseases. More specifically, for the patients who are undergoing surgical intervention for the treatment of their brain aneurysm, tumor, arteriovenous malformation or fistula, the investigators will inject the dye intraoperatively to assess for residual aneurysm, tumor or in general residual lesion which must be corrected.

Recruitment Criteria

Accepts Healthy Volunteers

Healthy volunteers are participants who do not have a disease or condition, or related conditions or symptoms

Study Type

An interventional clinical study is where participants are assigned to receive one or more interventions (or no intervention) so that researchers can evaluate the effects of the interventions on biomedical or health-related outcomes.

An observational clinical study is where participants identified as belonging to study groups are assessed for biomedical or health outcomes.

Searching Both is inclusive of interventional and observational studies.

Eligible Ages 18 Years and Over
Gender All
More Inclusion & Exclusion Criteria

Inclusion Criteria:

  • - Adult patients (age ≥ 18) - Diagnosed by preoperative imaging modalities to have a brain tumor (including metastatic brain tumors) or vascular lesions (aneurysm, arteriovenous malformation or arteriovenous fistula) requiring surgical intervention.
- The patient is determined by a board certified neurosurgeon to have a tumor or vascular lesion that would take up fluorescein - Patient or legally authorized representative provides written informed consent to enroll in this study

Trial Details

Trial ID:

This trial id was obtained from, a service of the U.S. National Institutes of Health, providing information on publicly and privately supported clinical studies of human participants with locations in all 50 States and in 196 countries.


Phase 1: Studies that emphasize safety and how the drug is metabolized and excreted in humans.

Phase 2: Studies that gather preliminary data on effectiveness (whether the drug works in people who have a certain disease or condition) and additional safety data.

Phase 3: Studies that gather more information about safety and effectiveness by studying different populations and different dosages and by using the drug in combination with other drugs.

Phase 4: Studies occurring after FDA has approved a drug for marketing, efficacy, or optimal use.

Phase 4
Lead Sponsor

The sponsor is the organization or person who oversees the clinical study and is responsible for analyzing the study data.

Florida Hospital
Principal Investigator

The person who is responsible for the scientific and technical direction of the entire clinical study.

Ravi Gandhi, MD
Principal Investigator Affiliation Florida Hospital
Agency Class

Category of organization(s) involved as sponsor (and collaborator) supporting the trial.

Overall Status Recruiting
Countries United States

The disease, disorder, syndrome, illness, or injury that is being studied.

Cerebrovascular Disorders, Intracranial Neoplasms
Additional Details

The research design is a prospective clinical study. All patients enrolled in the study will prepare for surgery as per standard neurosurgical indications, procedures and institution protocols. At the time of the anesthesia induction, with the patient under general anesthesia, Fluorescein Sodium 10% (100mg/1mL) at a dose of 500mg (100mg/ml) will be administered intravenously (the optimal dosage will be determined within the study as the most minimal dose for adequate visualization will be used). Surgery will continue with the aid of the Yellow 560 microscope with a minimum delay of 10 minutes after injection to reduce the amount of leakage of Fluorescein Sodium into the surrounding tissue. Conventional microsurgical and biopsy procedures and techniques including histopathology and intraoperative imaging will be performed through the completion of the surgery. The surgeon will resect and remove what he believes is the tumor based on previously known criteria (standards of care) regardless of what the Fluorescein angiography demonstrates. For vascular lesions, fluorescein sodium 10% (100mg/1mL) will be injected and used to assess its application after the conventional methods have confirmed the exclusion of the aneurysm. No patient's care will be affected by the results of the Fluorescein angiography. No other additional neurosurgical instruments will be used. Patients will be treated post-operatively with conventional adjunctive therapies and imaging as deemed necessary by the attending neurosurgeon for the evaluation of extent of surgery. Follow-up data (including post-operative images assessing outcomes and complications) will be collected on all patients on standard post-operative visits. Intra-operative films or recordings and all patient data may be saved and used according to HIPAA allowances.

Contact a Trial Team

If you are interested in learning more about this trial, find the trial site nearest to your location and contact the site coordinator via email or phone. We also strongly recommend that you consult with your healthcare provider about the trials that may interest you and refer to our terms of service below.

Florida Hospital, Orlando, Florida




Florida Hospital

Orlando, Florida, 32804

The content provided by NBTS on clinical trials is for informational purposes only and is not a substitute for medical consultation with your healthcare provider. We do not recommend or endorse any specific study and you are advised to discuss the information shown with your healthcare provider. While we believe the information presented on this website to be accurate at the time of writing, we do not guarantee that its contents are correct, complete, or applicable to any particular individual situation. We strongly encourage individuals to seek out appropriate medical advice and treatment from their physicians. We cannot guarantee the availability of any clinical trial listed and will not be responsible if you are considered ineligible to participate in a given clinical trial. We are also not liable for any injury arising as a result of participation. For a full description of terms please refer to: Terms, Conditions & Privacy