Chronic obstructive pancreatitis after healing of a necrotic pseudocyst.

Seven patients presented with chronic pancreatitis localized upstream to a complete stenosis of the main pancreatic duct in its median part. This stenosis seemed to be secondary to the healing of a necrotic pseudocyst after either acute pancreatitis (four patients) or blunt abdominal trauma (three patients). In five patients, after spontaneous regression of the clinical symptoms of the initial pseudocyst, a silent period which ranged from 2 to 5 months was followed by recurrent attacks of pain of lesser intensity and shorter duration (less than 2 days) than observed during the evolution of the initial pseudocyst. These attacks of pain decreased spontaneously with time, probably because of the atrophy of the left part of the pancreas drained by the obstructed duct (in 6 months to 2.5 years). In 2 patients, the initial pseudocyst was revealed at the same time as the obstructive pancreatitis. The histologic features of chronic obstructive pancreatitis have been described. Fibrosis uniformly spread throughout the diseased pancreas with uniform atrophy of the exocrine parenchyma. Dilated ducts showed far less damages than in chronic calcifying pancreatitis. Since spontaneous clinical healing may be observed, surgical treatment is often useless. Only in patients with severe or frequent attacks is a Roux-Y anastomosis with the dilated part of the main pancreatic duct indicated rather than a risky left pancreatectomy.