Background Cytoreductive surgery (CRS) with or without hyperthermic intraperitoneal chemotherapy (HIPEC) for peritoneal metastases traditionally includes omentectomy, even in the absence of visible omental metastases. We sought to determine the rate of occult histologic omental metastasis (OHOM), evaluate morbidity with omentectomy, and examine the rate of omental recurrence among patients undergoing CRS-HIPEC. Methods All CRS-HIPEC procedures from August 2007 to August 2020 were included in this single-center, retrospective, cohort study. Procedures were divided into those that included greater omentectomy (OM) and those that did not (NOM). The incidence of OHOM was evaluated specifically among the OM group with a grossly normal omentum. Multivariate regression analyses were performed to evaluate return of bowel function, ileus, and morbidity in the OM and NOM groups. Results Among 683 CRS-HIPEC procedures, 578 (84.6%) included omentectomy and 105 (15.4%) did not. The OM group had higher operative time, blood loss, peritoneal cancer index, number of visceral resections, and length of stay. In the OM group, 72 (12.5%) patients had a grossly normal omentum, and 23 (31.9%) of these had OHOM. Risk-adjusted return of bowel function, ileus, and 60-day complications were no different in the OM and NOM groups. Among 43 patients with residual omentum, 24 (55.8%) recurred, including 9 (20.9%) with omental recurrence. Conclusions Histologically occult metastasis was present in one-third of patients undergoing omentectomy during CRS-HIPEC. Omentectomy did not increase the rate of overall morbidity, and one-fifth of patients with residual omentum later developed omental recurrence. Thus, omentectomy is warranted in the absence of gross metastases during CRS-HIPEC.

Background: Kawasaki disease (KD) disproportionately affects children of Asian descent. San Diego is home to a large Vietnamese population but no previous study has addressed the outcome of KD in this group. Methods: We performed a retrospective review of Vietnamese patients seen at Rady Children's Hospital San Diego from 2001 to 2019. Non-Vietnamese Asian and non-Asian KD patients were matched (2:1) based on date of onset and age with Vietnamese patients. Demographic, clinical, and echocardiographic data were compared. Interviews with cardiologists at the Children's Hospital 1 in Ho Chi Minh City, Vietnam, explored local practices in the diagnosis and management of KD patients. KD publications in Vietnamese were translated and summarized. Results: Of 978 KD patients for whom both parents had the same ethnicity, 20 were Vietnamese (2.1%), 168 (17%) were non-Vietnamese Asian, and 789 (81%) were non-Asian. Vietnamese and non-Vietnamese Asians had an earlier median day of diagnosis at day 6 (interquartile range [IQR] 5-6) and 5.5 (IQR 4-6.75), respectively, compared with non-Asians (day 7, IQR 5-8.75, P = 0.02). Prominent cervical lymphadenopathy at diagnosis was more common in both Vietnamese and non-Vietnamese Asians (20% and 40%, respectively) compared with non-Asians (12.5%, P = 0.01). Importantly, Vietnamese KD patients had a higher rate of coronary artery aneurysms (60% vs. 27.5%) compared to non-Asians (P = 0.024). Vietnamese literature review and structured interviews suggested a high incidence and severity of KD in Vietnamese children. Conclusions: Physicians should be aware that Vietnamese children may be disproportionately affected by KD and have worse coronary artery outcomes.

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