5th February 2024

A 34-year-old male presents to the clinic with elevated triglycerides and cholesterol levels.

A 34-year-old male presents to the clinic with elevated triglycerides and cholesterol levels. He denied any symptoms prior to this and was previously well. Closer examination reveals yellow-orange nodules on his knees and elbows that have slowly grown over nine months, with yellow discolouration of the creases of his fingers and wrists. 

Which of the following is the likely underlying diagnosis?