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Abdominal Mass in NewbornsAka: Neonatal Abdominal Mass

Causes: Genitourinary and Retroperitoneal
1. Hydronephrosis (e.g. vesicoureteric reflux)
2. Bladder enlargement
3. Renal vein thrombosis
4. Cystic kidneys (e.g. Multicystic dysplastic kidneys)
5. Mesoblastic nephroma
6. Hydrocolpos
7. Ovarian Mass (e.g. Ovarian Cyst, teratoma)
8. Adrenal hemorrhage
9. Neoplasm (e.g. neuroblastoma, Rhabdomyosarcoma)
Causes: Gastrointestinal
1. See Hepatomegaly in Newborns
2. See Splenomegaly in Newborns
3. Gastrointestinal Duplications
4. Meconium ileus
5. Mesenteric or omental cyst
6. Pyloric stenosis
7. Volvulus
Evaluation
1. Abdominal XRay suggests Intestinal Obstruction
  1. Contrast radiographs
  2. Consult with pediatric surgery
2. Abdominal XRay non-diagnostic
  1. Imaging: Abdominal Ultrasound or Abdominal CT
  2. Labs
    1. Complete Blood Count
    2. Serum Electrolytes
    3. Urinalysis
References
1. Cloherty (1991) Neonatal Care, p. 501-4
2. Fuloria (2002) Am Fam Physician 65(2):265

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This page was written by Scott Moses, MD. This page was last revised before 5/10/08, prior to consistent tracking of revision date. This page was last published on 5/10/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 6.0.