Hosting 728 files, 2951 images, and 4 contributors.

Random Case

Pulmonary Abscess
Joseph Junewick, MD FACR
over 7 years ago
Enter A Workflow
Standard2   Academic2

Please choose a workflow. A standard workflow allows you to browse the repository with full case detail; the academic workflow allows you to browse the repository with limited case detail revealed. Double click on the images to launch image viewer.

ARSt Case Repository

Meconium Pseudocyst

Case Detail

Anatomy: Gastrointestinal
Joseph Junewick, MD FACR
Diagnostic Category: Developmental or Congenital
Created: over 10 years ago
Updated: over 10 years ago
Tags: PEDS
Modality/Study Types: CR US
Adobe32 PDF Imagej32 ImageJA


Newborn with prenatal history of polyhydramnios and abdominal calcifications.

Case Images


Meconium Pseudocyst

Clinical Notes

Distal small bowel perforation found at laparotomy.


CR – Subhepatic mass with faint peripheral clcifications; no dilated loops of bowel.

US – Complex sub-hepatic mass with peripheral calcifications and heterogeneous internal contents.


Meconium is a sterile mixture of desquamated epithelium, bile salts, enzymes, cholesterol and mucopolysaccharides. A chemical inflamatory process occurs when meconium spills into the peritoneal cavity. Bowel perforation may occur before or after birth. Etiology of perforation is largely related to obstruction (e.g., atresia, volvulus, meconium ileus). It is interesting that no obstructing lesion is found at surgery in a significant number of patients.

Peritonitis may be contained, fibroadhesive or generalized and quickly calcifies. Calcification patterns are variable. There may only be a few scattered calcifications, extensive peripheral plaque-like calcifications, scrotal/labial calcifications (patent process vaginalis), and psuedocyst calcification. Contained perforations result in the characteristic pseudocyst which is often right sided. Fibroadhesive inflammation results in intense fibroblastic reaction and adhesion formation.

On radiography calcifications, free air, signs of bowel obstruction, ascites, or pseudocyst may be found. On sonography calcifications, echogenic fluid containing particulate material, free air or pseudocyst may be seen. On MR, meconium is hyperintense on T1 sequences.


Foster MA, et al. Meconium peritonitis: Prenatal sonographic findings and their clinical significance. Radiology (1987); 165:661-665.

McNamara A, Levine D. Intraabdominal fetal echogenic masses: A practical guide to diagnosis and management. Radiographics (2005); 25:633-645.

Corporate Office: 616.363.7272, 3264 North Evergreen Drive, Grand Rapids, MI 49525

Spectrum Health Helen Devos Childrens Hospital GE HealthCare