Recurrent liposarcoma, previously confirmed as lipoma, has rarely been reported. However, the risk factors for recurrence and the correlation between benign lipoma and malignant liposarcoma remain unclear. In this case study, we suggest a precise diagnostic strategy to minimize recurrence and malignant transformation. A 60-year-old male patient with a history of left chest wall swelling without any symptoms underwent excisional surgery, and the mass was confirmed as a benign lipoma in 2015. In 2019, the patient returned to the hospital with symptoms of a palpable mass on the left chest wall. The mass was considered a recurrent lipomatous tumor with the possibility of malignant transformation. Magnetic resonance imaging (MRI) revealed a deep-seated, septate, intramuscular, irregular margin, and large lipomatous tumor invading the ribs, pleura, and adjacent muscle, suggestive of malignancy. The MRI findings were similar to those 4 years ago, except for margin irregularity and invasion to adjacent tissue. Wide en bloc excisions encompassing the 5th to 7th ribs, pleura, and adjacent muscle were followed by reconstruction with a pedicled latissimus dorsi muscle flap. The recurrent large lipomatous tumor was confirmed as well-differentiated liposarcomas through histological and MDM2-FISH immunohistochemical staining. Postoperatively, follow-up visits continued for 1.5 years without recurrence. We suggest that deep-seated, septate, and giant lipomatous tumors should be considered as risk factors for recurrence with the possibility of malignancy and misdiagnosis. It is important to inform patients of all these possibilities and plan close and long-term follow-up. We suggest that deep-seated, septate, and giant lipomatous tumors should be considered as risk factors for recurrence with the possibility of malignancy and misdiagnosis. It is important to inform patients of all these possibilities and plan close and long-term follow-up. Pelvic fractures associated with acute external iliac artery thrombosis is less common, it is easily ignored in clinical practice, and it can result in limb amputation and hemipelvectomy due to prolonged limb ischemia. We present 2 patients with acute external iliac artery thrombosis following pelvic fractures. Case 1 is a 49-year-old male with occlusion of the right external iliac artery and pelvic fractures. Case 2 is a 52-year-old male with left external iliac artery occlusion and bilateral internal iliac artery rupture following pelvic fractures. Case 1 was diagnosed with computed tomography angiography. Case 2 was diagnosed with ultrasound examination and computed tomography angiography. Case 1 was performed an open incision to remove thrombus of the right external iliac artery, the right iliac-femoral artery artificial bypass was adopted to restore the blood flow. Case 2 underwent segmental resection of the damaged artery and artificial vascular implantation of left external iliac artery, and angiographic embolization of bilateral internal iliac artery. However, a left hip disarticulation was performed due to osteofascial compartment syndrome at last. Case 1 was cured and discharged smoothly. Case 2 survived but left with a disability after disarticulation. Acute external iliac artery thrombosis after pelvic fractures is rare and limb-threatening, life-threatening. It is very important to detect and treat this potential complication timely when a patient with a pelvic fracture. Acute external iliac artery thrombosis after pelvic fractures is rare and limb-threatening, life-threatening. It is very important to detect and treat this potential complication timely when a patient with a pelvic fracture. Pneumococcal meningitis generally develops from bacteremia and is often complicated by multiple organ infection. A 62-year-old man with no previous medical history developed progressive disturbance of consciousness preceded by high-grade fever and headache for a few days. The patient was diagnosed with pneumococcal meningitis based on meningeal irritation, polymorphonuclear cell-predominant pleocytosis of the cerebrospinal fluid (CSF) and a positive pneumococcal urinary antigen test at a different hospital. Despite the administration of meropenem and vancomycin, his consciousness worsened, and the patient was transferred to our hospital. https://www.selleckchem.com/products/nvp-tnks656.html Marked nuchal stiffness was noted. The patient showed a disturbance of consciousness, with a Glasgow Coma Scale score of E3V2M5. No significant cranial nerve palsy, motor weakness or sensory impairment was observed. CSF examination showed polynuclear cell-predominant pleocytosis of 755/μL. Transthoracic echocardiography revealed infectious endocarditis. After the detection of penicillin-susceptible Streptococcus pneumoniae, the antibiotic regimen was changed to aminobenzylpenicillin 12 g/d and ceftriaxone 4 g/d, which improved the patient's consciousness and CSF findings. However, marked neck stiffness and neck pain persisted; we performed a systemic investigation that revealed cervical vertebral osteomyelitis and aortic aneurysm. After surgical treatment, the patient achieved complete remission of both conditions. We should consider vertebral osteomyelitis as a potential complication of meningitis when nuchal stiffness persists despite an improvement in meningitis. We should consider vertebral osteomyelitis as a potential complication of meningitis when nuchal stiffness persists despite an improvement in meningitis. Foramen magnum meningiomas are very rare lesions. They frequently originate from the arachnoid cells at the dura matter of the craniocervical junction. Foramen magnum meningiomas are challenging for neurosurgeons because of the complex anatomy of foramen magnum. We present a rare case of FMM with excessive calcification and without the dura tail sign which made the lesion mimic a teratoma. A 63 years old woman presented with progressive numbness and hyperesthesia of the shoulders and upper limbs for 2 and half years. She also experienced occasional headaches and dizziness with no nausea, vomiting or fever. Computed tomography scan, and magnetic resonance imaging revealed a calcified mass at occipital cistern. The lesion did not show the usual "dura tail sign" which made it mimic a teratoma on magnetic resonance imaging. Histopathology established meningioma. The tumor was completely resected via suboccipital approach. Two years follow-up revealed no recurrence of the lesion and no neurological deficits.