Welcome to the 4th Symposium on Parathyroid Fluorescence

Dear colleagues,

Thyroid and parathyroid surgery has become very safe during the last century. However, hypoparathyroidism remains a current concern, with significant, 1-30% rates of post-thyroidectomy hypoparathyroidism. There is currently no gold standard on how to detect and preserve parathyroid glands and their vascularization during thyroidectomy.

New optical-based techniques, without radiation, have been developed to help detect parathyroid glands (in particular autofluorescence) and confirm their vascularization (in particular ICG angiography). This has opened a new, exciting area of research for surgeons and scientists. Some of these devices are now approved by the FDA to help in real-time identification of parathyroid tissue during thyroidectomy and parathyroidectomy. New technologies are constantly developed to improve surgical outcome and we need a forum to discuss the impact and implications of such innovations.

After the success of the 2019, 2020 and 2021 symposiums, we decided to proceed with the 4th SPF symposium despite the COVID crisis. The fourth symposium will be in person in San Francisco, allowing people to meet and discuss the latest clinical and scientific knowledges regarding these promising techniques.

We are looking forward to an exciting and friendly exchange of ideas and to help move the field forward.

Frederic Triponez, Geneva
Quan-Yang Duh, San Francisco
Anita Mahadevan-Jansen, Nashville


Meeting Hotel

Hilton Union Square

333 O’Farrell Street

San Francisco, CA 94102

P: 415-771-1400


The Hilton Union Square is surrounded by many local favorites! Including restaurants, shopping, the Powell Street cable car, and much more! Enjoy panoramic views from the hotel’s Skybar, the city’s highest. You may also enjoy an outdoor pool and whirlpool during your stay. The hotel offers spacious guestrooms and a convenient grab-and-go market in the lobby.  


Room Reservations:

The room block at the Hilton Union Square is now closed. If you need to make a reservation or modify an existing reservation, please contact the ISITES Meeting Planner.



Reservation cancellations must be received by the hotel at least 72 hours prior to the scheduled arrival date in order to avoid a cancellation fee of one night’s room and tax.


Hotel Check-in: Hotel check-in is at 3:00pm local time, and check-out is at 11:00am local time. Every effort will be made to accommodate both early check-in and late check-out for guests, however it cannot be guaranteed and is based on the availability of the hotel.


For questions regarding the hotel and/or guestrooms, please contact the ISITES Meeting Planner for assistance. 



We arranged special meeting discounts on United Airlines. These special discounts are available by booking with United directly, through a travel agent, or online.

United Airlines


7:00 am–9:00 pm CST; Monday–Friday

8:00 am–5:00 pm CST; Saturday–Sunday

ACS Z Code: <ZKEJ>

Agreement Code: <275506>

Purchase your ticket online at united.com and receive a discount off the lowest applicable fares. When booking online, please enter <enter z code and agreement number> to receive your discount.  Area/Zone fares based on geographic location are also available with no Saturday night stay required.



Self-Parking: $66.12/day

Valet Parking: $79.80/day

*both allow for in/out privileges

The Hilton Union Square is located 14 miles from San Francisco International Airport (SFO) and 20 miles from the Metropolitan Oakland International Airport (OAK). Taxi service and ride share (Uber and/or Lyft) are available from both airports to the hotel.



The safety of our attendees, their families and patients, is paramount and we will continue to monitor COVID throughout our meeting planning process. A contingency plan is being developed in the event our in-person meeting is deemed inadvisable.


To enhance the safety for all in-person participants in San Francisco at the meeting, the Symposium on Parathyroid Fluorescence Meeting will be a COVID-19 VACCINATION REQUIRED event for all attendees, exhibitors, and staff.  Proof of COVID-19 vaccination will be required for all in-person attendees. Masks will also be required for all attendees, exhibitors, and staff (this includes hotel staff servicing our meeting).


Please click here for a list of nearby testing centers and COVID-19 guidelines for San Francisco.


Updated Health and Safety Protocols will be posted on the meeting website and emailed to registrants in advance of the meeting.


Dress Code:

Business attire is encouraged for all presenters and speakers and business casual attire is appropriate for attendees.


Know Before You Go:

Please reference the attached document for general meeting FAQs for all attendees.



Badges will be distributed once vaccine verification has been complete. Badges must be worn throughout the meeting space for the duration of the meeting. If you misplace your badge, please visit registration right away.


Things to do in San Francisco:

Find places to go, eat, and drink while you're staying at Hilton Union Square.

Additionally, there are several activities, main attractions, events, and shopping centers to explore. Click here to explore San Francisco.