Abstract
ABDOMINAL masses (Table 1) are not uncommon in newborn infants. They can be found in association with any organ system and frequently are of a variety not encountered in older patients or even in older children. Fortunately, malignant tumors are quite uncommon. Most of these lesions should be surgically extirpated, but several abdominal masses that occur in the newborn period should not be operated upon under the usual circumstances if diagnosed accurately beforehand (cyst of the spleen, adrenal hemorrhage and subcapsular hematoma of liver or spleen). There is honest difference of opinion concerning the operative management of another mass lesion . . .

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