Twiddler's Syndrome.

Teaching point: Twiddler's syndrome is a very rare but potentially disastrous complication after implantation of a neurostimulator or pacemaker, caused by twisting of the generator within the subcutaneous pocket, resulting in dislodgement and/or interruption of the electrodes that should be reported on x-ray.

Myositis Ossificans: A Mimicker of an Intramuscular Tumour.

Teaching point: Myositis ossificans is a do not touch lesion of which the radiological findings can be misleading in the early stages due to possible features mimicking a malignant process.

Gastric Outlet Obstruction Caused by Complicated Cholelithiasis: Bouveret Syndrome.

Teaching Point: Bouveret syndrome can be diagnosed on plain film, ultrasound, computed tomography and magnetic resonance imaging by demonstrating Rigler's triad which includes a dilated stomach, pneumobilia, and ectopic gallstone.

Parsonage-Turner Syndrome.

Teaching Point: Magnetic resonance imaging is a valuable imaging tool in Parsonage-Turner syndrome, a rare neurological disorder that presents as acute denervation in the distribution of the brachial plexus.

Cervical Myelopathy Caused by Engorged Epidural Cervical Plexus Associated with Iatrogenic Intracranial Hypotension.

Teaching Point: Iatrogenic overdrainage of cerebrospinal fluid may cause intracranial hypotension with secondary engorgement of the epidural venous plexus, resulting in potentially reversible compression radiculopathy or myelopathy.

A Rare Case of Cemento-Ossifying Fibroma of the Maxilla.

Teaching Point: Cemento-ossifying fibromas are rare, benign tumours that are mostly found in the tooth-bearing areas of the mandible or maxilla and can be seen on cone-beam computed tomography.

Hyperdense Basal Ganglia on Brain CT in Non-Ketotic Hyperglycemia Associated with Hemichorea.

Teaching Point: Unilateral choreiform movements combined with contralateral hyperdense lentiform and/or caudate nucleus on computed tomography is suggestive for non-ketotic hyperglycemia, warranting further metabolic workup.

Mirror-image Artifact of a Cephalhematoma Mimicking an Epidural Hematoma in a Newborn.

Teaching Point: When performing ultrasound examination of a cephalhematoma, the occurrence of a mirror-image artifact can mimic the presence of an epidural hematoma.