SUMMARY Background: Non-small cell lung cancer (NSCLC) is the most common cancer and has a high rate of bone metastases. Early detection of bone metastases is important in treatment and improves the quality of life for. Currently, there have been many studies on the value of bone scan in early detection of bone metastases, but this issue has not been fully evaluated. Objective: To evaluate the characteristics of bone metastases on scintigraphy in lung cancer. Methods: Cross-sectional description of a series of diseases, retrospective data on 151 patients with stage IIB - IVB non-small cell lung cancer, examined by bone scan with Tc-99m MDP (Methylene diphosphonate) before specialized treatment during the period from January 2020 to December 2021 at Can Tho City Oncology Hospital. Results: The incidence of men and women were 62,9% and 37,1%. The mean age is 60, the youngest is 35 and the oldest is 83. There are 56 patients (37,1%) with bone lesions on the scan. There are 47 lesions (83,9%) could be known as bone metastases: 46 cases are at stage IV and the other is at stage IIIB. The most common sites of lesions are from the ribs and sternum. Others are from thoracic spine, the sacrum and the coccyx. The bone lesions from the clavicle and upper extremities are rare. Most of bone lesions are multifocal, asymmetrical, and strongly radioabsorbed. Conclusion: Bone-image characteristics from scan in stage IIB – IVB non-small cell lung cancer have a high incidence of bone metastases. Therefore, the application of bone scan as a routine subclinical in the initial diagnosis of NSCLC before treatment is essential in order to properly assess the stage of the disease, make an accurate prognosis and have a reasonable treatment strategy. Keywords: Bone scan, non-small cell lung cancer

SUMMARY Background: Ultrasound is a minimally invasive diagnostic technique with the highest accuracy and sensitivity in the diagnosis of lymph node metastasis. Objectives: The study consists of objectives: Describe the ultrasound imaging characteristics of cervical lymph nodes in treated patients with differentiated thyroid cancer. Materials and methods: A cross-sectional descriptive study design was conducted on 89 patients diagnosed with differentiated thyroid cancer and found that the cervical lymph nodes were potentially malignant under ultrasonography and indicated fine-needle aspiration cytology under ultrasound guidance. Results: Among 89 study subjects, the main reason for admission was lymphadenopathy, accounting for 95.5%. The results of papillary pathology accounted for 96.6%. Time after thyroid surgery when cervical lymph node metastasis is detected is 1-3 years (27%). The time after thyroid surgery when cervical lymph node metastasis was detected was 6-36 months (38.2%). Oval shape on ultrasound has 73%, cortex on ultrasound accounts for 65.2%, decreased lymph node on ultrasound accounts for 64%, loss of hilar lymph nodes on ultrasound accounts for 62.9%. Conclusion: Ultrasound plays an important role in diagnosing the stage of the disease, fully and accurately describing the lesions and stage of the disease, helping to increase the effectiveness of treatment. Keywords: ultrasonic imaging, lymph nodes, differentiated thyroid cancers.

SUMMARY Aim: The study was carried out with the aim of evaluating the improvement of degree of vertebral body slippage after spinal fixation posterior slide manipulation with disc removal, by combining vertebaral body fusion TLIF surgery and assessingthe improvement in the level of post-X-ray-based vertebral slip, with clinical comparison. Method: A total of 39 patients diagnosed with lumbar vertebral stem slide who were surgically treated at the Department of Orthopedic and Spinal Injuries of Bach Mai Hospital between July 2021 and July 2022 were included in the study. Results: The results of the study showed that patients with lumbar vertebral slippage experienced the most in the L4-L5 position accounting for 67.4%, followed by L3-L4 accounting for 22.5%, L5-S1 accounting for 13.1%. All 100% of patients improved in the height of the disc gap between the vertebrae. No more diseases showed signs of ladder. Signs of intermittent pain also improved, and 80 percent of patients were able to travel longer distances than before. Conclusion: Postoperative X-ray examination showed that thepatients were corrected in surgery quite well, all patients had reduced levels of postoperative slippage and increase intervertebral space height. Keywords: routine X-ray, lumbar vertebral stem slide, TLIF surgery

SUMMARY Purpose: To describe the imaging characterization of high-resolution magnetic resonance imaging of retinoblastoma Material and method: About 50 patients were diagnosed and monitored for retinoblastoma treatment at the National Eye Hospital and performed 3T magnetic resonance at Saint Paul General Hospital from October 2020 to May 2022. Description of tumor intraocular lesion: Number, location of tumor, largest diameter. Description of tumor characteristics: Signals on sequences T1W, T2W, FLAIR, DWI and enhancement properties after injection. Other accompanying features: Intra-tumor calcification, retinal detachment, vitreous hemorrhage, optic nerve invasion, invasion outside the eyeball, intracranial lesions Results: 50 patients in the study had an average age of 21.2 months, and the age of the one-eye disease group was higher than that of the two-eyed disease group. 3T MRI is a good method for diagnosing retinoblastoma tumors, with the largest dimension measuring 13.8 ± 4.2 mm, the tumor distribution is mainly on the retina in the post-equatorial region. Tumor image on MRI compared with vitreous signal, mostly increased signal on T1W (92.6%), decreased on T2W (98.8%), increased on FLAIR (100%), restriction on DWI (100%) and enhancement after injection. Signs of calcification are specific for retinoblastoma, however, on MRI the ability to detect calcification is limited. Although the detection of calcification is limited, it has good ability in invasive assessment such as choroidal invasion (15.6%), scleral invasion (3.1%), optic nerve invasion (31.3). %). Severe prognostic signs such as retinal detachment (34.4%), vitreous bleeding (26.6%). Conclusion: 3T magnetic resonance is a good method of diagnosing retinoblastomas as well as assessing the invasiveness of tumors. Keywords: Retinoblastoma, High resolution magnetic resonance imaging of retinoblastoma

SUMMARY Purpose: Describe imaging characteristics and evaluate the role of 18FDG-PET/CT in the diagnosis of cervical lymph nodes in nasopharyngeal cancer patients. Subjects and methods: Prospective description of 60 patients with nasopharyngeal carcinoma identified by biopsy and histopathology and untreated (in which 55 patients with undifferentiated carcinoma and 5 patients with squamous cell carcinoma), were taken with 18FDG PET/CT and compared with ultrasound and done FNA lymph nodes respectively, from June 2018 to July 2019 to K Central Hospital, Tan Trieu campus. All 18FDG-PET/CT films were read and compared with their respective locations on ultrasound and lymph node FNA before treatment. Results: In total 60 patients common age is 52.3±11.1, male/female ≈ 5/1; A total of 379 bilateral cervical lymph nodes on PET/CT, 195 lymph nodes in the left neck are common (51.5%), the most common lymph node location in group II (96.7% of patients and 61% of total lymph nodes). There are 322/379 (85%) lymph nodes with structural loss on ultrasound, there is a correlation between lymph node size and lymph node absorption on 18FDG-PET/CT with r=0.6, cervical lymph node groups 322/379 Structural abnormal lymph nodes with SUVmax = 9.5 ± 4.6 (nearly 4 times higher than 57/379 normal lymph nodes with SUVmax = 2.6 ± 2.5). In a total of 379 lymph nodes over 60 patients, there was a close agreement between the lymph nodes with loss of umbilical fat structure on ultrasound with SUVmax>2.5 threshold of 92.9% (kappa=0.67) and better at the threshold. SUVmax>3.5 was 92.9% (Cohen's kappa=0.75) on PET/CT. In addition, cytology was positive in 60/89 lymph nodes undergoing FNA, which was in close concordance with ultrasonography of loss of hilar fat structure and cytological diagnosis of 83.4% (Cohen's kappa = 0.62). ). The cytological diagnosis was mild with increased uptake with SUVmax>2.5 threshold of 75.3% (Cohen's kappa = 0.3), but there was a strong correlation when the lymph node imaging was increased. Absorption with SUVmax >2.5 on PET/CT and loss of umbilical cord fat on ultrasound with cytological diagnosis was 87.6% (Cohen's kappa = 0.69). In particular, out of a total of 340/379 lymph nodes with threshold SUVmax>2.5 on PET/CT are considered as metastatic nodes, changing the stage of 25/60 patients (41.67%); in which 17 patients increased and 8 patients decreased stage N compared with staging by other imaging methods before having PET/CT. Conclusion: 18FDG-PET/CT scan is an imaging method with accurate diagnostic value in diagnosing cervical lymph nodes in patients with cervical cancer, useful for treatment planning. Key words: lymph nodes, nasopharyngeal cancer, 18FDG-PET/CT lymph nodes on nasopharngeal cancer.

SUMMARY Objective: Describe the imaging characteristics of an intracranial aneurysm on 3 Tesla magnetic resonance at Bach Mai hospital Methods : A prospective study was performed on 29 patients with clinical manifestations of neuropathy who were diagnosed with 3 Tesla magnetic resonance brain aneurysms and then underwent digital subtraction angiography at the Radiology Center, Bach Mai Hospital, Hanoi, Vietnam from August 2021 to August 2022. Description of intracranial aneurysms in terms of number, location, shape, morphology and size measure. Results: Of the 29 patients, 37 aneurysms were detected on 3 tesla magnetic resonance and confirmed on digital subtraction angiography. The location of intracranial aneurysms is common in the anterior circulation (97.29%), and the posterior circulation (2.71%). Dimensions are mainly ≤ 10mm (97.3%). Usually saccular aneurysms (94.6%) and narrow neck (51.43%). Most aneurysms have irregular margins, knobs or two bases (72.97%). Conclusion : Magnetic resonance 3 Tesla can replace digital subtraction angiography erasing the background to characterize the image of intracranial aneurysms. This is a safe, non-invasive and highly valuable imaging method in the diagnosis of intracranial aneurysms, a very effective first choice for screening intracranial aneurysms and providing information for neurologists implement appropriate treatment strategies. Keywords: 3T magnetic resonance, intracranial aneurysm

SUMMARY Objectives : to describe the clinical features and images of MR defecography in patients with obstructive defecation syndrome, afterward evaluating the value of MR defecography in the diagnosis of obstructive defecation syndrome. Subjects and methods: cross-sectional study, 33 patients were diagnosed with obstructive defecation syndrome according to ROME IV criteria, were assigned to have MR defecography at Saint Paul General Hospital, during the period of study from January 2019 to July 2022. Results: About the general characteristics of the study group: mainly in women with 84,8%, the average age is 63.5 ± 12.5 years old. Rectocele is the most commonly detected lesion on clinical examination, with 12/33 cases, accounting for 36.4%. About image characteristics on pelvic floor dynamic MRI: the mean value of H line in normal phase is 4.7 ± 0.9cm, in strain phase is 5.9 ± 1.5cm. The mean value of the M-line in normal phase is 2.0 ± 0.2 cm, and 4.1 ± 0.3 cm in strain phase. Rectocele is the most common lesion, accounting for 63.6%. The detection rate of rectocele and associated lesions (cystocele, uterus descent, cervical descent, vaginal descent) on MR defecography is higher than that on clinical examination, the difference was statistically significant with p<0.05. Conclusion : Our study contributes to clarifying the high applicability of MR defecography in diagnosing the causes and grading of pelvic floor prolapse, pelvic organ prolapse in patients with obstructive defecation syndrome, combined with clinical symptoms to help clinicians make appropriate treatment indications for each patient. Key words: MR defecography, Obstructed defecation syndrome, Rectocele. *

SUMMARY Objective: To evaluate the results of treatment of trigeminal neuralgia by microvascular decompression surgery and Meckel’s cavity alcohol injection Subject and method: 62 patients with trigeminal neuralgia which medical treatment did not control the pain or had side effects, the patient then received microvascular decompression surgery or Meckel’s cavity alcohol injection performed at Saint Paul general Hospital from January 2017 to June 2021 Results: From January 2017 to June 2021, 62 patients with trigeminal neuralgia underwent microvascular decompression surgery or Meckel’s cavity alcohol injection at Saint Paul general Hospital. Of these, 24 patients were treated by surgical decompression and 38 patients were treated with Meckel’s cavity alcohol injection. The results of pain relief time of both methods in both short and long term are not statistically significant with p<0.05 according to Log rank test. The complication rate of the two methods is similar right after the intervention but will be lower in the surgical group after 3 months of intervention (p < 0.05 in Chi-squared test). Conclusion: The short and long-term analgesic effect of the two methods of microvascular decompression surgery and Meckel’s cavity alcohol injection are similar, the difference is not statistically significant. Key words: Microvascular decompression surgery, Meckel’s cave alcohol injection, Trigeminal neuralgia.