The Fluorescent Patient: An Unusual Effect of Fluorescein Angiography

Although fluorescein is widely used for intraoperative angiography, some of its side effects remain obscure. In this report, we present the case of a 41-year-old patient with chronic ischemia caused by moyamoya syndrome who underwent bypass revascularization with intraoperative fluorescein angiography (FA). Immediately after the surgery, the patient presented homogeneous fluorescence of the entire skin. We discuss this curious phenomenon as well as other side effects that may arise due to FA.


Introduction
Fluorescein angiography (FA) is widely used in vascular and oncological neurosurgery [1,2,3], as well as ophthalmology [4]. It represents a more cost-effective solution when compared to indocyanine green (ICG), especially in low and middle-income settings. Based on the duration, outcome, and need for medical assistance, complications and side effects related to FA can be categorized into mild, moderate, or severe [5]. We describe a case in which a patient became entirely fluorescent after its use for video angiography during a superficial temporal artery to middle cerebral artery bypass surgery for moyamoya syndrome, a chronic vaso-occlusive crisis disease of unknown etiology that had caused chronic, diffuse cerebral ischemia in the patient. Although FA is a widely used substance for intraoperative angiography, some of its peculiar side effects may be unknown to most.

Case Presentation
A 41-year-old female patient with chronic ischemia caused by moyamoya syndrome was submitted to revascularization with a superficial temporal artery to middle cerebral artery bypass. With an adapted filter consisting of an ultraviolet filter and a yellow barrier filter ( Figure 1) [3,6], FA was made possible with an S88® (Carl Zeiss Meditec, Jena, Germany) surgical microscope. Intravenous fluorescein was injected in a single 100-mg dose, allowing for the confirmation of bypass patency [7]. After the surgery, the patient's skin and sclera were found to have acquired a yellowish hue (pseudojaundice). Examination through the microscope with the attached filter revealed fluorescence of the patient's entire skin ( Figure 2). No other symptoms were observed.

FIGURE 1: Custom-made filter
Photograph showing the custom-made snap-on filter consisting of a yellow barrier filter (red arrow) and an ultraviolet filter (green arrow) Even though FA is a widely used technique worldwide, especially in ophthalmology, there is a paucity of reports in the literature regarding benign skin complications that may arise from it. Kurli et al. [8] reported a case of skin discoloration and hypothesized that there could be a correlation between a previously diagnosed lymphoproliferative disorder and patchy skin discoloration. Saleh et al. [9] have reported a similar case in a patient who had not been diagnosed with other non-ophthalmologic pathologies, thus failing to link its occurrence to illnesses.
Although most reported reactions seem mild, consisting of nausea, vomiting, mild allergic reactions, and accidental arterial injections, severe reactions with fluorescein have been previously reported in a survey from 1986 [10]. These included acute pulmonary edema, bronchospasms, anaphylaxis, myocardial infarction, seizures, and death [10]. A critical point with respect to this study is that death was considered to be related to fluorescein if the symptoms related to the cause of death occurred in the first 24-48 hours after the injection. Only one death was reported among the 222,000 patients included in the survey, and the exact cause was not disclosed. These nefarious complications have not been reported in the most recent studies, and until now, only 11 deaths have been documented in the medical literature pertaining to this subject [5,11].
Several mechanisms have been proposed to explain the adverse effects of fluorescein, including vasovagal reaction, drug allergy, histamine release, anxiety-related medullary sympathetic discharge, direct vasospastic toxic effect, and drug contamination [5]. However, none of them seem to fully explain the pseudojaundice phenomenon, for which further studies are needed in the field. Pseudojaundice has also been previously reported in the elderly and suggested as a potential differential diagnosis for pathological causes of jaundice [12,13].
Physicians can see a reaction similar to that of our patient in cases of accidental arterial fluorescein injections [14]. In such cases, fluorescein tends to stain the territory of irrigation belonging to that specific artery, associated with intense pain and skin discoloration [14]. In our case, the patient remained asymptomatic. The dye impregnated her skin diffusely, in a presentation consistent with pseudojaundice, other than patchy skin discoloration, associated with the fluorescence of the entire skin when observed with proper filter and lighting that lasted for several hours. To the best of our knowledge, there are no other reports of this unusual condition in the literature. Table 1 provides details about the fatalities related to fluorescein reported in the literature, and Table 2 summarizes complications associated with fluorescein as presented in the literature.

Conclusions
We reported a case of a patient who presented with pseudojaundice and fluorescence of the skin and cornea following intraoperative FA; it lasted for several hours, but no treatment was required. FA has been used to a lesser extent in neurosurgery than ophthalmology, and gaining knowledge of its possible side effects is crucial for better communication with patients and managing complications. It seems to be a safe and costeffective method of intraoperative video angiography. The differences between benign side effects and potentially harmful occurrences should be well understood and explained to the patients. New and updated survey studies should be performed to update current knowledge on this topic, especially on a global scale.

Additional Information Disclosures
Human subjects: Consent was obtained or waived by all participants in this study. Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following: Payment/services info: All authors have declared that no financial support was received from any organization for the submitted work. Financial relationships: All authors have declared that they have no financial relationships at present or within the previous three years with any organizations that might have an interest in the submitted work. Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work.