### symptom | abscess:

Brain abscess
* are bacterial infections in the skull and brain
  - typically multilocular and well demarcated with thick walls
* can also occur due to acute otitis media as can facial nerve paralysis
  - be bacterial, fungal, or parasitic
  - develop due to lack of pulmonary capillary filtration of microorganisms
* focal suppuration within the brain parenchyma.
* is caused by bacteria, fungi or parasites
  - the only condtion in which fibroblasts proliferate within the brain parenchyma
  - uncommon in children

Breast abscess
* are infrequent in nonlactating women.
* have variable appearances depending on the stage of inflammation.

Liver abscess
* are a problem with cattle fed high concentrate rations
  - common when high grain rations are fed
* can be prevalent in cattle with erratic feed intakes fed high concentrate diets
  - occur without previous diarrhea
  - result from infections or penetrating injuries to the liver
* is more common in adolescents and adults.

Lung abscess
* Most lung abscesses related to aspiration are polymicrobial and include anaerobes.
* involve the lung parenchyma, while empyema involves the pleural space.

Perianal abscess
* are common conditions.
* is common in Management of perianal abscess.

Peritonsillar abscess
* can be very dangerous and occasionally fatal.
* complication of acute tonsillitis.
* do require antibiotic treatment.
* is an infection of the tissue around the tonsils
  - angina
  - generally a disease of older children, adolescents, and young adults
  - much more likely to be seen in young adults than in children
  - pus in the peritonsillar space
  - relatively common in adults but rare in infants and young children

Pyogenic abscess
* are usually solitary and often multiloculated with thickened enhancing walls.
* can be solitary, multiple, and multilocular.

Retropharyngeal abscess
* are generally a disease of young children and are uncommon in adults.
* can occur at any age but most commonly is seen in young children.
* requires immediate attention to prevent severe complications.

Skin abscess
* Most skin abscesses are curable with treatment.
* term given to collection of pus.

### symptom:

Apnea
* also causes extreme fatigue.
* can also be a symptom of diabetes or hypothyroidism
  - be a serious disorder
* causes daytime sleepiness by preventing a person from getting uninterrupted sleep.
* common problem with premature infants that they outgrow.
* condition in which the ventilaiton of the lungs is suspended for a short period of time.
* is 'want of breath'
  - associated with either a fall in oxyhemoglobin desaturation or an arousal from sleep
  - easy to diagnose
* is more common in men by a factor of ten
  - frequent in the obese and can occur at any age and both sexes
  - most common when the baby is sleeping
* is the absence of breathing
  - pause in, or sudden lack of, breathing
  - treated with ventilatory support
  - very common among premature babies in the early weeks of life
  - when no ventilation occurs at all
* life-threatening disorder that requires immediate medical attention.
* means to stop breathing.
* refers to the cessation of breathing during the night.
* rouses the snorer from sleep so breathing can resume.

### symptom | apnea:

Central apnea
* is associated with cessation of all respiratory movements
  - the absence of breathing efforts
* occurs when the child seems to 'forget' to breathe.

Mixed apnea
* have both central and obstructive components
  - obstructive and central sleep apnea events
* is the term used when the two apneas occur together.

Obstructive apnea
* cessation of breathing that last ten seconds or more.
* is secondary to upper airway obstruction.