A 43-year-old woman presented to the emergency department with acute nausea and vomiting. She was admitted by the general surgery team with a suspected obstruction of the small bowel. Examination and imaging revealed an enlarged uterus (18 × 9 × 16 cm) with fibroids. Nine years earlier, she had undergone a uterine myomectomy by means of midline laparotomy, after which postoperative pancreatitis and bleeding had occurred followed by repeat laparotomy.The next morning (midweek), a laparotomy was performed to identify and treat the source of the obstruction. An incision from the base of the sternum to the symphysis pubis was made, followed by dissection of some minor adhesions next to the terminal ileum. No discrete bands were identified that could explain the obstruction. The gynecology service was then consulted to manage the fibroid uterus.Upon arrival, the staff gynecologist was informed by the senior surgery resident that no cause of the obstruction was found. The resident then left the operating room. The gynecology team completed a subtotal hysterectomy, after which the sponge count was incorrect. The abdomen and pelvis were explored, but no sponges were found. A radiograph of the abdomen showed no signs of a retained sponge (Figure 1). The abdomen was closed and the patient transferred to the recovery room.The circulating nurse remained concerned about the incorrect sponge count and followed up with the gynecologist the next day. The gynecologist requested a computed tomography (CT) scan, and the patient was informed of the incorrect sponge count. At the time, the institution's policy did not require a routine follow-up CT scan if the count was incorrect. The CT scan showed a radiopaque marker indicating a sponge in the lesser sac below the greater curvature of the stomach (Figure 2).The gynecology team performed an exploratory laparotomy. A packing sponge was found and removed from the lesser sac. No other concerns or complications arose, and all sponge counts were correct. The patient made an uneventful recovery.