RT Journal Article SR Electronic T1 Lesson of the month 2: Cauda equina in Cushing’s syndrome JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 88 OP 90 DO 10.7861/clinmedicine.16-1-88 VO 16 IS 1 A1 Douglas Maslin A1 Ioannis Gounaris A1 Kenrick Ng A1 Pippa Corrie YR 2016 UL http://www.rcpjournals.org/content/16/1/88.abstract AB We present the case of a 34-year old woman who initially presented with obesity and back pain. She was eventually diagnosed with Cushing's syndrome secondary to an adrenocortical carcinoma that had metastasised to her spine, causing cauda equina compression. The delays in reaching the correct diagnosis caused significant morbidity and exemplify the pitfalls of premature closing, a common cognitive error in diagnostic reasoning.