{'fraction_non_alphanumeric': 0.013179571663920923, 'fraction_numerical': 0.0, 'mean_word_length': 5.468085106382978, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Primary mesenteric leiomyosarcoma masquerading as a pancreatic pseudocyst.

To the Editor: Primary tumors of the mesentery are rare, and accurate preoperative diagnosis based upon radiologic or clinical findings is uncommon. We report herein a case of a patient with a primary epithelioid leiomyosarcoma of the transverse mesocolon that had been mistakenly diagnosed and surgically treated as a pancreatic pseudocyst for over a year. A review of the world literature on primary tumors of the mesentery was performed to facilitate the clinical, radiologic, and pathologic identification of these rare tumors.