Tejas Patil, MD, is a medical oncologist. Lisa Ferrigno, MD, MPH, FACS, is a trauma surgeon. Working with lung cancer patients at University of Colorado Cancer Center, they both, independently, noticed something strange: A small percentage of patients taking high doses of the drug osimertinib (Tagrisso) were developing a rare twist in the right side of their colon, a condition called cecal volvulus. Their case series, published in the journal Frontiers in Oncology, describes three of these patients, suggesting that doctors who use osimertinib with EGFR+ non-small cell lung cancer patients may consider watching for rare cases of cecal volvulus along with more expected side effects.