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[Objective] The spatial-temporal variations of soil water erosion before and after the Wenchuan earthquake in the Baisha River basin of Dujiangyan City, Sichuan Province were assessed to support water source protection efforts and comprehensive control of soil erosion in the earthquake-stricken area. [Methods] The characteristics of soil water erosion (i. e., area, intensity, and spatial distribution) in the Baisha River basin from 2007 to 2020 were quantitatively analyzed by using the Chinese Soil Loss Equation (CSLE). [Results] ① The intensity of soil water erosion after the Wenchuan earthquake in the Baisha River basin initially increased and then decreased. The average soil erosion modulus values for the Baisha River asin were 817.51, 3 000.11, 5 828.89, 1 549.76, and 1 558.37 t/(km2·a) in 2007, 2008, 2013, 2018, and 2020, respectively. The intensity of soil erosion in 2020 was mainly classified as light erosion, and the average soil erosion modulus was 48.1% lower than in 2008. ② The average soil erosion modulus gradually increased with increasing slope gradient or altitude. Soil erosion amount contributed by regions with slope greater than 35° and elevation above 2 000 m accounted for 85.44% and 68.20%, respectively, of the total erosion amount in 2020. In addition, the extremely severe erosion area with an average soil erosion modulus of more than 5 000 t/(km2·a) mainly occurred in areas with elevation above 4 000 m. ③ Although the average vegetation coverage in the Baisha River basin in the past 10 years was between 60% and 74%, the proportion of the area classified as having moderate and more severe erosion was still greater than before the earthquake. In 2020, the proportion of moderate and more severe erosion area was 4.13 times greater than in 2007. [Conclusion] Even though the soil water erosion situation has effectively improved between 2013 and 2020, areas of intense and more severe erosion remain in the middle and upper reaches of the study area, and the topographic conditions and rainfall erosivity had an obvious impact on the change in erosion area.

Abstract: Malignant pleural mesothelioma is a rare tumor with a poor prognosis. We describe a case of 55-year-old man without asbestos exposure history presenting with extensive lymph nodes with high 18 F-FDG uptake in PET/MRI but atypical pleural manifestations thereby being misdiagnosed for lymphoma. Pathological examination concludes for an epithelioid mesothelioma-associated lymph node metastasis. This case emphasizes that with the extensive lymph node abnormalities shown in PET imaging, in addition to the general consideration of lymphoma, it is still necessary to be vigilant about the possibility of mesothelioma and emphasizes the necessity of pathological examination., Competing Interests: Conflicts of interest and sources of funding: none declared., (Copyright © 2024 Wolters Kluwer Health, Inc. All rights reserved.)

Abstract: Struma ovarii is a rare form of ovarian teratoma composed entirely or mainly of mature thyroid tissue. A 55-year-old woman with persistent hypogastric pain for 4 months was admitted to our hospital. She had undergone resection of struma ovarii 4 years ago. Contrast-enhanced CT shows multiple significantly enhanced nodules scattered in the abdominopelvic cavity. Pathological examination of the nodule in the left pararenal region demonstrated thyroid-like follicular epithelium. Herein, we present the 99m TcO 4 whole-body scintigraphy SPECT/CT findings of a case of struma ovarii with extensive peritoneal implants metastasis. Then, she was treated with total thyroidectomy and 131 I therapy., Competing Interests: Conflicts of interest and sources of funding: The research was supported by the “1.3.5 Project for Disciplines of Excellence, West China Hospital, Sichuan University (ZYGD23016).”, (Copyright © 2024 Wolters Kluwer Health, Inc. All rights reserved.)

Abstract: Myeloid sarcoma is a neoplastic mass formed by the infiltration of primitive or immature myeloid cells into organs and tissues outside the bone marrow. It may occur before, at the same time, or manifest as the recurrence of acute myeloid leukemia, myelodysplastic syndromes, and chronic myeloproliferative syndromes. It may involve any organ or tissue, including skin, soft tissue, lymph nodes, and gastrointestinal tract and bone. Isolated humerus involvement is extremely rare. Herein, we present the FDG PET/CT findings of a rare case of isolate myeloid sarcoma in the right humerus, which showed only increased bone density with moderate FDG uptake., Competing Interests: Conflicts of interest and sources of funding: none declared., (Copyright © 2023 Wolters Kluwer Health, Inc. All rights reserved.)

Competing Interests: Conflicts of Interest: All authors have completed the ICMJE uniform disclosure form (available at https://qims.amegroups.com/article/view/10.21037/qims-22-1018/coif). The authors report that this research was supported by the 1.3.5 Project for Disciplines of Excellence, West China Hospital, Sichuan University (No. ZYGD18016), and the Sichuan Science and Technology Program (No. 2022YFH0047). The authors have no other conflicts of interest to declare.

Extensive tumor thrombus and simultaneous pulmonary metastasis in glioma patient is rare. Herein, we reported a 45-year-old woman with extensive tumor thrombus in sagittal sinus and sigmoid sinus with obvious enhancement on magnetic resonance imaging (MRI). Fluorine-18-fluorodeoxyglucose ( 18 F-FDG) positron emission tomography/computed tomography (PET/CT) showed extensive tumor thrombus in sagittal sinus, sigmoid sinus andinternal jugular vein, and simultaneous left hilar lymph node andpulmonary metastasis. Our case demonstrated the value of 18 F-FDG PET/CT for correctly identifying tumor thrombus,detecting extent of tumor thrombus and distant metastasis in high grade glioma patients.

Langerhans cell histiocytosis (LCH) of the spine involving the intervertebral disk and adjacent vertebra is rare in adults. We report a case of a 56-year-old woman with neck pain and right upper limbs numbness. Fluorine-18-fluorodeoxyglucose positron emission tomography/computed tomography ( 18 F-FDG PET/CT) showed an osteolytic bone lesion in the fourth cervical vertebra (C4) with soft-tissue mass, invading the adjacent intervertebral disc and posterior vertebral body of C3, compressing dural sac and cervical spinal cord. The lesion showed increased 18 F-FDG uptake with a maximum standardized uptake value (SUVmax) of 6.75. Subsequently, the histopathologic examination confirmed the diagnosis of LCH.

Primary bone lymphoma (PBL) is a rare primary extranodal lymphoma. It can occur in many parts of the body but rarely in the maxilla. We describe a case of fluorine-18-fluorodeoxyglucose positron emission tomography/computed tomography ( 18 F-FDG PET/CT) imaging revealed solitary osseous lytic lesion with intense uptake in the maxilla, suggesting a primary skeletal malignancy. The subsequent histopathologic examination confirmed the diagnosis of high-grade B-cell lymphoma (HGBL).