篠崎 正美¹, 税所 宏光¹, 時長 一元¹, 山口 武人¹, 松谷 正一¹, 江原 正明¹, 木村 邦夫¹, 土屋 幸浩¹, 大藤 正雄¹, 奥田 邦雄¹, 唐沢 英偉²

Masami SHINOZAKI¹, Hiromitu SAISHO¹, Kazumoto TOKINAGA¹, Taketo YAMAGUCHI¹, Shouichi MATSUTANI¹, Masaaki EBARA¹, Kunio KIMURA¹, Yukihiro TSUCHIYA¹, Masao OHTO¹, Kunio OKUDA¹, Eii KARASAWA²

¹千葉大学医学部第一内科, ²国立横浜東病院内科

¹The 1st Department of Medicine, Chiba University School of Medicine, ²Department of Internal Medicine, Yokohamahigashi National Hospital

キーワード : Tumor-forming pancreatitis, Inflammatory mass of the pancreas

Tumor-forming pancreatitis is widely noticed as a pathology which is hardly differentiated clinically from carcinoma of the pancreas. In this study, sonographic transition of tumor-forming pancreatitis was observed in 20 patients. The inflammatory masses observed on ultrasonography (US) disappeared finally in all patients. These patients could be classified into three groups by the disappearance time of the masses as follows: the rapid group where mass findings disappeared within one month (6 patients), the intermediate one where they remained more than one month but disappeared within three months (5 patients), and the prolonged one where they were sustained more than three months (9 patients). In the rapid and the intermediate group, the clinical figures were much common. That is, in general, these patients had no previous history of pancreatitis, and no evidence of pancreatic stones with radiological proof of mild changes of the pancreatic duct system. The pathology seen in these group could be clinically considered to be formed in early phase of chronic pancreatitis, and sometimes in acute pancreatitis, In the prolonged group, there were seen various histories of chronic pancreatitis, and severe changes of the pancreatic duct, sometimes with pancreatic stones. The masses seen in these patients could be considered to be formed in an advanced phase of chronic pancreatitis.
In most patients with some exceptions of the prolonged group, US findings showed a clear tendency of normalization of the masses within one months. To appreciate sonographic transition of tumor-forming pancreatitis could be useful in the clinical differentiation from pancreas carcinoma.