<unk>  is a congenital deformity (often present at birth) of the sternum, which is pressed into the chest, resulting in a "caved-in" or sunken appearance.
The deformity is sometimes considered to be a cosmetic rather than functional problem,however, recent studies have shown cases where<unk>  has impaired cardiac and respiratory function, and sometimes caused pain in the chest and back.
Psychologically, untreated patients, especially youths, can experience negative psychosocial effects throughout their lives, avoiding activities where a shirt is not worn. Public awareness of<unk>  is limited, so youths suffering of the disorder may feel very alone. Media coverage has been scarce.
The condition usually progresses during the time of rapid bone growth in the early teenage years. Estimates for the prevalence of this condition range from one in 150 to 1000 children. Though the cause is not certain, the male/female ratio is 3 to 1, and occurrences of the condition in family members have been reported in 35% to 45% of cases. These features may suggest a genetic component may be involved, although some authorities believe the condition occurs in a sporadic fashion. Incidence is especially high among patients with inherited connective tissue disorders such as Marfan syndrome.<unk>  is sometimes referred to as "cobbler's chest", "funnel chest", "sunken chest", "chest bowl", or simply a "dent".
Pectus excavatum
Acromioclavicular separation
Pediculosis pubis
Pediculus capitis
Subungual hematoma
Pediculus corporis
Nursemaid's elbow
Pili pseudoannulati