Conclusion:
This case describes the first known instance of choledochoduodenal fistula secondary to DLBCL of the pancreas, an extremely rare and complex interplay between lymphoproliferative disorders and gastrointestinal manifestations. While DLBCL can present with nodal or extra-nodal involvement, its occurrence in the pancreas with subsequent fistula formation is exceedingly rare within the literature. This case underscores the importance of maintaining a high index of suspicion for fistula formation in patients presenting with persistently deranged liver function tests in the context of previously treated haematological malignancies. Clinical vigilance, early identification and a multidisciplinary approach are paramount for optimal management, although further research is needed to identify the mechanisms driving fistula formation.
Consent:Appropriate verbal and written consent was obtained from the patient.
Author Contributions: Author 1: Writing - Original Draft Preparation, Writing - Review and Editing Author 2: Writing - Original Draft Preparation, Writing - Review and Editing Author 3: Supervision Author 4: Writing - Review and Editing, Supervision