9th February 2024

A 43-year-old male with an 8-month history of depression and weight loss presents with a 6-month history of pruritic skin rash affecting his buttocks and groin.

A 43-year-old male with an 8-month history of depression and weight loss presents with a 6-month history of pruritic skin rash affecting his buttocks and groin. This began as a ring-shaped painful erythematous region that blistered and eroded with crusting. A trial of prednisolone for the rash was previously unsuccessful. Blood tests revealed a blood glucose of 23mmol/L. He has no medical history but was recently diagnosed with a DVT. A CT scan has revealed a small pancreatic mass within the tail.

Given the likely diagnosis, which cells comprise most of the mass?