title: Bowel perforation complicating an ACTH-secreting phaeochromocytoma.
abstract: ACTH-secreting phaeochromocytoma (ASP) is a rare cause of ACTH-dependent Cushing's syndrome (CS). We report the case of a 63-year-old female presenting with CS secondary to an ASP complicated by bowel perforation. This case report highlights ASP as an uncommon but important cause of ectopic ACTH secretion (EAS). There have been 29 cases of ASP, all of which were unilateral and benign, but associated with significant complications. Patients presenting with ASP have the potential for cure with unilateral adrenalectomy. Given this promising prognosis if recognised, ASP should be considered in the diagnostic workup of ACTH-dependent CS. As this case demonstrates, gastrointestinal complications can arise from severe hypercortisolaemia associated with CS. Early medical and surgical intervention is imperative as mortality approaches 50% once bowel perforation occurs.
  
  
  CONCLUSIONS
  Consider phaeochromocytoma in the diagnostic workup of ACTH-dependent CS; screen with plasma metanephrines or urinary catecholamines.Serial screening may be required if ACTH-secreting phaeochromocytoma is suspected, as absolute levels can be misleading.Early catecholamine receptor blockade and adrenal synthesis blockade may avoid the need for rescue bilateral adrenalectomy in ACTH-secreting phaeochromocytoma.Consider early medical or surgical management when gastrointestinal features are present in patients with CS, as bowel perforation due to severe hypercortisolaemia can occur and is associated with significant mortality.
authors.affiliation: Austin Health , Heidelberg, Victoria , Australia.
authors.forename: Elise
authors.initials: E
authors.lastname: Flynn
authors.affiliation: Austin Health, Heidelberg, Victoria, Australia; University of Melbourne, Parkville, Victoria, Australia.
authors.forename: Sara
authors.initials: S
authors.lastname: Baqar
authors.affiliation: University of Melbourne , Parkville, Victoria , Australia.
authors.forename: Dorothy
authors.initials: D
authors.lastname: Liu
authors.affiliation: Austin Health, Heidelberg, Victoria, Australia; University of Melbourne, Parkville, Victoria, Australia.
authors.forename: Elif I
authors.initials: EI
authors.lastname: Ekinci
authors.affiliation: Austin Health , Heidelberg, Victoria , Australia.
authors.forename: Stephen
authors.initials: S
authors.lastname: Farrell
authors.affiliation: Austin Health, Heidelberg, Victoria, Australia; University of Melbourne, Parkville, Victoria, Australia.
authors.forename: Jeffrey D
authors.initials: JD
authors.lastname: Zajac
authors.affiliation: Austin Health , Heidelberg, Victoria , Australia.
authors.forename: Mario
authors.initials: M
authors.lastname: De Luise
authors.affiliation: Austin Health, Heidelberg, Victoria, Australia; University of Melbourne, Parkville, Victoria, Australia.
authors.forename: Ego
authors.initials: E
authors.lastname: Seeman