Optic nerve sheath diameter measurement for the paediatric patient with an acute deterioration in consciousness.

Ocular Point of Care Ultrasound (PoCUS) is emerging as a valuable utility within emergency medicine. Optic nerve sheath diameter (ONSD) has been demonstrated to correlate closely with intracranial pressure (ICP) and an elevated measurement can detect raised ICP readily, where fundoscopy may not, owing to both technical challenges and insufficient clinical skills. A previously fit and well 10-year-old girl presented to the paediatric emergency department with worsening headache, fever and lethargy. On examination, her left pupil was large, and not reactive to light. Initially, her GCS was 15 but suddenly dropped to 8/15. Her blood tests showed raised inflammatory markers. A CT head was reported as possible pansinusitis and MRI of her brain was initially reported as showing evidence of meningeal irritation only. Due to her drop in GCS PoCUS of optic nerve sheath was conducted which showed evidence of increased ICP with increased optic nerve sheath diameter of 6.8mm. This led to a reassessment of the MRI imaging by the neurosurgical team who felt there was evidence of subdural empyema. The patient was transferred to the tertiary neurosurgical centre, where an emergency evacuation of subdural empyema was carried out. Staphylococcus aureus and Streptococcus pyogenes were grown from pus samples. Early detection of raised ICP is of paramount importance in terms of being able to instigate neuroprotective measures and prevent adverse neurological outcomes. PoCUS is a readily available, non-irradiating, easily repeatable, well-tolerated and readily teachable ultrasound modality and a useful tool which should be employed in paediatric and adult emergency departments.

Use Of POCUS for the Paediatric Patient with an Undifferentiated Upper Limb Injury.

A 2-year-old girl presented to the Paediatric Emergency Department following an unwitnessed injury to her left arm while playing at nursery limiting further examination. On assessment she was reluctant to use her left arm and further examination was difficult. In cases of unwitnessed and undifferentiated elbow injuries point of care ultrasound (POCUS) can be used to evaluate for elbow joint effusion, fracture, or radial head subluxation, also known as nursemaid's elbow. Pulled elbow is a commonly encountered paediatric injury but based on the history and examination findings it may not always be obvious. We present an approach to the child with an undifferentiated elbow injury incorporating POCUS as a means of increasing the reliability of findings on clinical examination.

A Rare Cause of Neck Lump in an Infant.

A 5 month old girl presented to the Paediatric Emergency Department with a rapidly growing neck mass over 24 hours. She was systemically well and otherwise asymptomatic. On examination she had a mobile, soft and non-tender 5 cm x 5 cm neck mass. Blood tests were unremarkable with normal inflammatory markers. Point of Care Ultrasound (POCUS) was done which showed a solid left sided neck mass with increased vascularity but no evidence of collection or abscess. Given the atypical presentation and rapid growth the patient was commenced on empirical antibiotics and was discussed with both tertiary ENT and Oncology teams. An MRI was performed which was indeterminate. Biopsy of the neck mass was positive for Ewing Sarcoma. This is a rare case of Ewing Sarcoma in an infant. POCUS can be used to rule out common pathology and abnormal lymph nodes, aiding in ongoing investigation and management in neck lumps.