Probably no other symptom of childhood is more common than abdominal pain localized at, or just above, the navel. It corresponds to headache in adult life in the relative frequency of its occurrence, and often in its significance. This analogy, with some probability, is due to the fact that the chief center of the child's sympathetic nervous network lies in this location, which in early life has a more dominant r\l =o^\l e than at any other time. Whereas, in older patients the onset of disease is heralded by pain in the head, in children its initiation is frequently marked by pain in the abdomen. To distinguish such symptomatic pain from that significant of pathologic changes of the abdomen requires thoughtful consideration on the part of any practitioner, whether he is an internist, pediatrician or surgeon. Because of this fact, it does not seem inappropriate for me to discuss chronic intussusception, although it is a purely surgical disease, the major symptom of which is abdominal pain.
FACTS RELATIVE TO INTUSSUSCEPTION IN GENERALAlthough it may occur at any age, intussusception is primarily a dis¬ ease of early life, 75 per cent of cases occurring during the first year. The vast majority are acute, but the subacute or chronic type does occur. The latter may also appear at any age, but it is seen characteristically in the second and third decades of life. Males are affected two or three times as often as females.1 The factors involved in the production of intussusception are unknown, but it seems that the most plausible theory is the one advanced by Clubbe 2 in his excellent monograph on this sub¬ ject. He expressed the opinion that while the bowel is performing its normal peristaltic movement, a constriction of the annular muscular coat occurs which may be purely local. If this constriction is greater than normal, the limit of physiologic invagination is exceeded, and the first degree of pathologic intussusception develops. If his surmise is correct, it helps to explain the predominance of this condition in infancy,