8th April 2024

A 63-year-old taxi driver presents with a one-month history of diarrhoea and a neck mass

A 63-year-old taxi driver presents with a one-month history of diarrhoea and a neck mass. He also reports unintentional weight loss of 5kg in one month. He has no past medical history, takes no regular medications and smokes 10 cigarettes a day for the last 20 years. He rarely drinks alcohol. Histology of the neck mass shows spindle-shaped cells without follicle development.

What is an associated feature of the most likely diagnosis?

Select the SINGLE most appropriate option from the list below. Select ONE option only.