The 30-day readmission rate after colorectal surgery is between 9% and 25% [1-5]. In the UK, over 190,000 people live with a stoma and it is estimated that there are over 13,500 stoma operations performed annually [6]. Patients who undergo ileostomy or colostomy creation are a subset who have a reportedly higher rate of readmission [1,2,5].Thirty-day readmission rates in those who have an ileostomy formed is reported to be between 25% and 30% [7,9]. The most common cause is dehydration (accounting for 37%-43% of readmissions) [7,8,10]; other causes include intraperitoneal infections, extraperitoneal infections and ileus [7,8]. Demographic factors associated with an increased readmission rate include male gender, age > 65 years, preoperative steroids, postoperative high-output

This article reports a notable finding of conspicuous refractile polarising rhomboid crystal structures detected within pathology samples of drain fluid from a patient, following endoluminal negative‐pressure sponge therapy. The sponge material was further analysed to confirm the suspected origin.