{'fraction_non_alphanumeric': 0.02711864406779661, 'fraction_numerical': 0.006779661016949152, 'mean_word_length': 5.467153284671533, '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}}
Superior mesenteric artery branch aneurysm with spontaneous hemoperitoneum.

A 70-year-old man without any particular medical history or past trauma was referred to our hospital with a complaint of intermittent epigastric pain lasting for 1 day. On admission, his vital signs were stable, and he exhibited diffuse abdominal tenderness without distention, rebound or guarding. Except for a decreased level of hemoglobin at 105 g/L, all the laboratory values were within the normal ranges. Abdominal computed tomography (CT) revealed the presence of an ill-demarcated hyperdense mass inseparable from the small bowel mesentery(Picture A). Contrast-enhanced CT revealed a mesenteric hematoma accompanying with a mesenteric branch artery aneurysm (Picture B-D). As the patient was hemodynamically stable, his family refused surgery and embolization. His symptoms subsided with conservative