Demographic characteristics, clinical manifestations, and treatment outcomes of May-Thurner Syndrome: a five-year retrospective analysis using computed tomography venography in a Chinese population.

Objective: This study aimed to analyze the demographic characteristics, symptoms, and treatment outcomes of patients diagnosed with May-Thurner syndrome (MTS) using computed tomography venography (CTV).

Methods: Medical records of patients diagnosed with MTS through CTV at Hebei General Hospital of China between April 1, 2017, and May 31, 2022, were reviewed. The data collected included: (1) gender, age, body mass index (BMI), and smoking and drinking habits; (2) time of onset and symptoms of MTS, as well as other accompanying symptoms; (3) additional diagnoses, length of hospital stay (days), treatment methods, treatment success, and the occurrence of post-treatment bleeding or recurrence. Descriptive statistics were used, with mean ± standard deviation and median values reported. The t-test/u-test and Chi-square test (including the exact probability method) were used to compare means and rates, respectively, with a significance level set at α = 0.05.

Results: Out of 402 patients (233 males, 169 females), 118 (29.4%) were diagnosed with MTS, with 47 (21.1%) males and 71 (39.7%) females. The incidence of MTS was significantly higher in females than males (χ² _proportion = 16.545, χ² _composition = 9.763, p < 0.05). The average ages of male and female MTS patients were 56.4 and 59.9 years, respectively, with mean BMIs of 27.05 and 27.09 kg/m². Among male patients, 27.7% (13) were smokers, and 17.0% (8) consumed alcohol. Inferior vena cava (IVC) thrombosis was notable in 59.3% of MTS patients, with a significantly higher proportion in females (70.4%) than in males (42.6%) (χ² = 9.102, p < 0.05). Lower limb swelling without pain was reported by 70.3% of patients, with 53.4% (44.7% male, 59.2% female) experiencing swelling on the left side only, which was significantly more common than swelling on the right side only or both sides (χ² = 44.554, p < 0.05). Additionally, 12.7% of patients reported both swelling and pain, with left-side symptoms being more prevalent than right-side or both sides. The average ages at symptom onset were 51.3 ± 17.1 years in males and 57.1 ± 13.2 years in females. All treatments for MTS were successful without bleeding or recurrence. The most common treatment method was balloon dilation combined with stent placement (57.6%).

Conclusion: CTV is highly effective in detecting and facilitating the successful treatment of MTS. It should be fully utilized to promote early diagnosis and treatment of MTS. Female MTS patients need more medical resources for diagnosis and treatment.