Table 1.

Surgical challenges associated with each organ

Surgery	Risk	Technical difficulty
Brain	Low if no craniotomy is required. High if craniotomy is required.	Low if no craniotomy is required. Medium if craniotomy is required.
interscapular-Brown Adipose Tissue	Low: no major bleeding likely. No complex stabilization required.	Low: a simple incision will expose the organ.
Kidney	High risk of major bleeding and systemic compromise if surgery is unsuccessful.	Low: a simple incision will expose the organ and stabilization is easy to perform.
Gonadal-White Adipose Tissue	Low: if unsuccessful, no major systemic compromise exists.	Low: a simple incision will expose the organ.
Lymph node	Low: if unsuccessful, no risk of major systemic compromise exists.	Medium: it is a complicated surgery and requires high precision, specialized stages, and a high level dexterity.
Pancreas/Spleen	High risk of major bleeding and systemic compromise if surgery is unsuccessful.	High: a precise incision is required to avoid organ retraction and major bleeding.
Liver	High risk of major bleeding and systemic compromise if surgery is unsuccessful.	High: a precise incision is required for adequate organ stability and to avoid major bleeding.
Lungs/Heart	High: failure could result in respiratory or cardiac collapse, or poor local or systemic oxygenation.	High: thoracotomy, tracheotomy and intubation are complex procedures.