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Intracranial dural arteriovenous fistula (DAVF) with perimedullary venous drainage may cause brainstem swelling and represent a diagnostic challenge. A 66-year-old man presented to the emergency room with recurrent vertigo, minimal truncal ataxia with a wide-based gait, and a slightly impaired tandem gait. Brain magnetic resonance imaging (MRI) revealed a hyperintense lesion in the left pontomedullary area on T2-weighted images (T2WIs) with partial gadolinium enhancement, but without increased signals on diffusion-weighted images. Abnormal serpentine flow void vessels surrounding the medulla and upper cervical spinal cord were initially overlooked but discovered later. An angiogram revealed DAVF with feeders from the right occipital artery and the meningeal branch of the right distal vertebral artery with drainage into the anterior medullary venous system and the perimedullary veins. The patient underwent a successful transarterial endovascular embolization and improved gradually. A brain MRI at 3-month follow-up revealed a residual hyperintense signal on the T2WIs in the left lower medulla. Six cases of patients exhibiting DAVF with isolated unilateral brainstem swelling from the literature were reviewed. Isolated unilateral brainstem swelling due to intracranial DAVF with perimedullary venous drainage is extremely rare and might mimic a tumor on MRI. Abnormal serpentine flow void vessels on the surface of the brainstem or spinal cord are crucial diagnostic clues.

The frequency of stroke mimics among stroke patients has been reported to be up to 30%, and that in patients who receive thrombolytic therapy ranges between 1% and 16%. Atlantoaxial dislocation with myelopathy mimicking stroke is extremely rare. An 83-year-old man with a history of old cerebellar infarction presented to the emergency department with acute left hemiplegia after a chiropractic manipulation of the neck and back several hours before symptom onset. Mild hypoesthesia was observed on his left limbs. No speech disturbance, facial palsy, or neck or shoulder pain was observed. Intravenous thrombolytic treatment was given 238 min after symptom onset. Brown–Sequard syndrome subsequently developed 6 h after thrombolysis with a hypoesthetic sensory level below the right C5 dermatome. An emergent brain magnetic resonance angiography did not reveal an acute cerebral infarct but rather an atlantoaxial dislocation causing upper cervical spinal cord compression. Clinical symptoms did not deteriorate after thrombolysis. He received successful decompressive surgery 1 week later, and his muscle power gradually improved, with partial dependency when performing daily living activities 2 months later. A literature review revealed that only 15 patients (including the patient mentioned here) with spinal disorder mimicking acute stroke who received thrombolytic therapy have been reported. Atlantoaxial dislocation may present as acute hemiplegia mimicking acute stroke, followed by Brown–Sequard syndrome. Inadvertent thrombolytic therapy is likely not harmful for patients with atlantoaxial dislocation-induced cervical myelopathy. The neurological deficits of patients should be carefully and continuously evaluated to differentiate between stroke and myelopathy.

Central nervous system symptoms occur in more than 80% of patients with scrub typhus infection; however, the entity of central nervous system involvement is still not fully understood. We present the case of a patient with fulminant scrub typhus with multiple organ failure, including prolonged deep coma, and detail the sequential neurological symptoms, signs, laboratory data, and neuroradiological findings. Keywords: Scrub typhus, Encephalitis, Neuroimaging

Amyand's hernia is a rare form of inguinal hernia in which an inflamed appendix is incarcerated in a hernial sac. The clinical presentation of Amyand's hernia varies, depending on the extent of inflammation involved in the hernial sac and the presence or absence of a scrotal abscess. If a scrotal abscess is present, this usually indicates that the appendix in the hernial sac is perforated. However, without the availability of computed tomography (CT) scans, the condition is often preoperatively misdiagnosed as a strangulated inguinal hernia. We describe a rare case of a 64-year-old man who presented at our emergency room complaining of scrotal swelling and pain. Diagnosis of Amyand's hernia with a scrotal abscess was confirmed preoperatively by CT scan.

Intravascular papillary endothelial hyperplasia (IPEH), also known as Masson tumour, is a rare nonneoplastic vascular lesion caused by the abnormal proliferation of endothelial cells. IPEH presenting as a soft-tissue mass may simulate a sarcomatous tumour clinically and radiographically. We report an infant with IPEH affecting the right calf. The MRI appearance is described, and the literature is briefly reviewed. Knowledge of the MR characteristics of IPEH may facilitate its diagnosis and obviate an invasive procedure.