CASE 16716 Published on 17.04.2020

Gastric Intramural Pseudocyst – Rare presentation

Section

Abdominal imaging

Case Type

Clinical Cases

Authors

Dr Aarthi Parthasarathy MD, Dr Sachin Gullapa Shatagar MD, Senior Resident, Dr Ram Shenoy Basti MD PDCC

Department of Radio Diagnosis, Father Muller Medical College, Mangalore, Karnataka, India

Patient

39 years, male

Categories
Area of Interest Abdomen ; Imaging Technique CT
Clinical History

A 39-year-old male patient who presented with abdominal pain and had a past history of pancreatitis for a duration of 3 weeks. The patient was first evaluated with gastroscopy, which revealed external compression on fundus –suggestive of spontaneous pseudocyst or gastric fistula. He was then sent for CECT.

Imaging Findings

On CECT abdomen, the body and tail of the pancreas appeared bulky with peripancreatic fluid – suggestive of pancreatitis. There was presence of multiple pseudocysts, a pseudocyst measuring 52x47 mm noted in the intramural location with thickened walls. Another large pseudocyst was noted in the tail of the pancreas extending upwards into the lesser sac through oesophagal hiatus and into the lower mediastinum. Pseudocysts were also noted located along the inferior surface of the left hemi diaphragm. Ultrasound was also done as part of completion and there was evidence of splenic varices, moderate ascites and left pleural effusion in addition to pseudocysts

Discussion

Intramural pseudocysts of the GIT are very rare and have been reported in the stomach, duodenum and colon. The rarity of intramural pseudocysts suggests that the GIT wall seems to be a relatively strong barrier to proteolytic activity of pancreatic enzymes. However, once the barrier is broken, the expansion of the intramural pseudocyst can lead to pain and the obstruction of the lumen, as was seen in the majority of our patients [1]. With accumulation of pancreatic secretions, these pseudocysts may extend within the wall or may rupture into the bowel lumen. The endoscopic appearance of gastric intramural pseudocyst resembles any gastric submucosal lesion, as was in our case. The CECT is a useful investigation for confirming the cystic lesion of the lesion as well detecting features of acute or chronic pancreatitis [2].

CECT is also a useful investigation for diagnosis of duodenal intramural pseudocysts and the CT characteristics of intramural involvement are an extension of the pseudocyst along the course of the duodenum and flattening of the pseudocyst wall at the border of the GIT lumen [3].
However, EUS is the most useful investigation for evaluating patients with intramural pseudocysts. It can help in evaluating the contents of the cyst in detail, excluding significant necrotic debris and ascertain the relationship of the cyst with the various layers of the GIT wall [3]. The role of endoscopy in diagnosing intramural pseudocysts is limited as its endoscopic appearance resembles any duodenal submucosal lesion.

Aspiration of fluid high in amylase and lipase content is also a reliable modality for confirming the diagnosis of intramural pseudocyst as was done in one of our cases [4]. Due to their rarity, there is no consensus on the best approach for their management. A majority of published cases have either been diagnosed at laparotomy or treated by surgical decompression [4]. However, as the intramural pseudocysts are immediately adjacent to the GIT lumen, they can effectively be treated by endoscopic aspiration/drainage, as was done in the majority of cases.

Intramural pseudocysts of the upper GIT are very rare and CECT is a useful investigational modality for diagnosing and characterising them. Gastric intramural pseudocysts frequently present with abdominal pain and symptoms of gastric outlet obstruction, but they can also present as an atypical location in cases of pancreatitis.

Differential Diagnosis List
Gastric intramural pseudocyst secondary to pancreatitis
Gastric fistula
Serous cystadenoma of Pancreas
Choledochal cyst
Final Diagnosis
Gastric intramural pseudocyst secondary to pancreatitis
Case information
URL: https://www.eurorad.org/case/16716
ISSN: 1563-4086