Systematic review and meta-analysis of the prevalence of abdominal aortic aneurysm in Asian populations.

OBJECTIVE: The prevalence of abdominal aortic aneurysms (AAAs) is well reported in Western countries and AAA screening programs are well-established. However, although individual studies have reported that the prevalence of AAAs is lower in Asian populations, high-quality data on the prevalence of AAA in Asians are relative lacking. The present study aimed to systematically synthesize the data available in the literature and report the prevalence of AAAs in Asians. METHODS: An electronic search was performed using two major databases (PubMed and EMBASE) with no limitations imposed on the year of publication. The review conformed to the PRISMA (Preferred Reporting Items for Systematic reviews and Meta-Analyses) guidelines. Studies that reported the prevalence of AAAs in Asians were selected, and the population characteristics, AAA definition, method of screening, target population, and total number of patients screened were recorded. RESULTS: Our search yielded 157 unique articles. After a full-text review, 17 articles were included in the present study. All 17 studies of fair quality. The overall AAA prevalence was 1.30% (95% confidence interval [CI], 1.01%-1.59%) in Asian populations. The prevalence of AAAs was 2.56% (95% CI, 1.81%-3.31%) in Asian populations selected for cardiovascular risk factors and 0.61% (95% CI, 0.37%-0.85%) in Asian populations not selected for cardiovascular risk factors. CONCLUSIONS: The prevalence of AAAs in the general Asian population is low. However, the prevalence in Asian populations selected for cardiovascular risk factors approaches the prevalence of AAAs in Western populations. As such, screening for AAAs in carefully selected Asian male populations with cardiovascular risk factors could potentially yield benefits. Opportunistic screening for AAAs during ultrasound examination of the abdomen or transthoracic echocardiography for other indications could also be considered. However, further studies are needed to evaluate the potential benefits of screening for AAAs in carefully selected Asian populations.

Systematic review of isolated disseminated carcinomatosis of bone marrow from colorectal cancer.

BACKGROUND: Colorectal cancer (CRC) metastasis commonly occurs in the liver and lungs with bone metastasis rarely occurring in isolation. Disseminated carcinomatosis of bone marrow (DCBM) is extremely rare in CRC. We conducted a systematic review to provide more information on the diagnosis, treatment options, and prognosis of the condition. METHODS: Studies were identified by performing searches on MEDLINE and EMBASE electronic databases according to the PRISMA statement standards. We included a single patient whom we treated for metastatic CRC presenting with DCBM in our study. Statistical analysis was performed using SPSS software version 23.0. RESULTS: A search through 5502 unique studies yielded 14 studies that were eventually included. There was a total of 17 cases of DCBM in CRC with back pain and constitutional symptoms as the most common presenting complaints. DCBM in CRC was associated with markedly elevated CEA of 275.57 (95% CI 17.13-534.00). There was no predilection for site of primary tumour. Overall median survival was 120 days (95% CI 64.43-175.58). The median survival for patients who received chemotherapy was 240 days (95% CI 71.11-408.89), as compared to 9 days (95% CI 1.80-16.20) for patients who received best supportive treatment. CONCLUSION: DCBM from CRC is extremely rare. Bone marrow examination remains the gold standard for diagnosis. Colonic stenting or surgical diversion may be more appropriate than primary resection in obstructed CRC in view of the poor prognosis. Systemic chemotherapy shows promise in increasing median survival.