Neupsy Key

  AQUEDUCTAL STENOSIS   KEY FACTS     Accounts for 20% ofallhydrocephalus cases; generally presents in infancy but may manifest at any time.     This spectrum of disorders includes congenital narrowing of…

  PANTOTHENATE KINASE DEFICIENCY (HALLERVORDEN-SPATZ SYNDROME)   KEY FACTS     Rare autosomal recessive disorder (abnormal gene: 20pl3); deficiency of pantothenate kinase leading to accumulation of cysteine, free radicals, and iron deposition….

  CHOANAL NARROWING   KEY FACTS    Can be of two types: stenosis and atresia (note: severe stenosis behaves clinically like atresia), further subdivided into bony or soft tissue (plugs); for…

  ANNULAR FISSURES   KEY FACTS     Most are found in the lumbar spine of middle-aged and older adults but may occur at any age.     They are seen as small…

  MENINGIOMA   KEY FACTS     Most common extra-axial adult tumor; most common intracranial tumors (15% to 20%) in adults.     Occurs mainly in middle-aged women (possibly because of increased sensitivity…

  TEMPORAL BONE FRACTURES   KEY FACTS   Longitudinal type     Most common (70% to 80%) type of temporal bone fractures; results from blows to the temporoparietal region.     Results in…

  NEUROFIBROMATOSIS TYPE 1, ASTROCYTOMAS AND NEUROFIBROMAS   KEY FACTS     Autosomal dominant (chromosome 17) or sporadic (50%) disorder, ten times more common than NF-2; prominent cutaneous lesions, plexiform neurofibromas, and…

  OCCIPITOATLANTO SEPARATION   KEYFACTS     Commonly a fatal injury caused by rupture of craniocervical ligaments (tectorial membrane, cruciate, apical, and alar ligaments) due to rapid deceleration with hyperflexion or hyperextension…

  SKULL FRACTURES   KEY FACTS     Linear fractures or sutural diastases with no underlying brain injury are generally not clinically significant; formation of leptomeningeal cysts and/or herniated brain (“growing fracture”)…

  ANTERIOR COMMUNICATING (ACOMM) ARTERY ANEURYSMS   KEY FACTS     Represent 30% to 35% of intracranial aneurysms.     Overall incidence of intracranial aneurysms is 2% to 8% of population; risk of…