Background Clear-cell carcinoma arising from the surgical cesarean section scar is very infrequent. The present study reports two patients with clear-cell carcinoma arising from an abdominal wall scar 20 and 23 years after their last cesarean section. Case presentation Both Iranian patients had prior cesarean sections nearly 20 years earlier. Patients 1 and 2 had transverse and vertical abdominal incisions, respectively. The initial clinical presentation was a huge lower abdominal mass at the site of the previous cesarean section scar. Both patients underwent abdominal wall mass biopsy. The histological analysis revealed the presence of malignancy. Both patients underwent full-thickness resection of the abdominal wall mass. All surgical margins were tumor-free; however, patient 1 had a very narrow tumor-free margin near the pubic symphysis. As the imaging report of patient 2 revealed the presence of a pelvic mass, the exploration of the intraperitoneal space, simple total abdominal hysterectomy (TAH), bilateral salpingo-oophorectomy (BSO), and the excision of enlarged pelvic lymph nodes were performed during the surgery. Six cycles of paclitaxel and carboplatin every 3 weeks as adjuvant chemotherapy was administered for both patients after the surgery. One of the patients had disease recurrence 5 months after the termination of chemotherapy, and the other is still disease-free. These two patients had similar pathology and received a similar initial adjuvant treatment; however, they were different in terms of the direction of tumor spread, tumor distance from the pubic symphysis, status of tumor margins, and surgical procedures. Conclusions We encountered distinct prognoses in the clear-cell carcinoma of cesarean section scars presented herein. The researchers can recommend complete surgical excision of the abdominal wall mass with wide tumor-free margins, exploration of the abdominopelvic space, TAH, and BSO during the first surgery.

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Background: Ascending thoracic aortic aneurysm (ATAA) is an asymptomatic localized dilation of the aorta that is prone to rupture with a high rate of mortality. While diameter is the main risk factor for rupture assessment, it has been shown that the peak wall stress from finite element (FE) simulations may contribute to refinement of clinical decisions. In FE simulations, the intraluminal boundary condition is a single-phase blood flow that interacts with the thoracic aorta (TA). However, the blood is consisted of red blood cells (RBCs), white blood cells (WBCs), and plasma that interacts with the TA wall, so it may affect the resultant stresses and strains in the TA, as well as hemodynamics of the blood. Methods: In this study, discrete elements were distributed in the TA lumen to represent the blood components and mechanically coupled using fluid–structure interaction (FSI). Healthy and aneurysmal human TA tissues were subjected to axial and circumferential tensile loadings, and the hyperelastic mechanical properties were assigned to the TA and ATAA FE models. Results: The ATAA showed larger tensile and shear stresses but smaller fluid velocity compared to the ATA. The blood components experienced smaller shear stress in interaction with the ATAA wall compared to TA. The computational fluid dynamics showed smaller blood velocity and wall shear stress compared to the FSI. Conclusions: This study is a first proof of concept, and future investigations will aim at validating the novel methodology to derive a more reliable ATAA rupture risk assessment considering the interaction of the blood components with the TA wall.

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Background: Supportive respiratory care and airway management are very important in treating COVID-19 patients with respiratory failure. There are two techniques for supporting patients with respiratory failure. Objectives: The current study aims to evaluate the efficacy and quality of patient care with early tracheostomy in intensive care unit (ICU) and compare mortality, hospital stay, and outcome between intubation and early tracheostomy. Methods: This study is conducted on total patients with confirmed COVID-19 in the ICU centers of a tertiary hospital. At the beginning of the study, all patients were intubated and connected to a mechanical ventilator. Within three days, the intensivists randomly performed bedside percutaneous dilational tracheostomy (PDT) for half of the patients. Early tracheostomy was defined as conducting tracheostomy within three days from intubation. Results: The total number of 36 patients was included in the study and categorized into two groups, including 18 patients in the early tracheostomy and 18 in orotracheal intubation. Half of the patients (50%) in the tracheostomy group were recovered from COVID-19 respiratory failure and discharged from ICU and hospital. All patients in the intubation group were expired. The length of staying alive in ICU in patients with an early tracheostomy was 26.47±3.79 compared with 7.58±2.36 days in intubated patients. Conclusion: The early tracheostomy compared with orotracheal intubation in respiratory failure patients with COVID-19 can significantly decrease mortality. However, airway management with an early tracheostomy increases the hospitalization stay and can increase recovery. So, conducting the early tracheostomy is recommended in this study.