A large anastomosing hemangioma in the left lobe of liver

Rationale: Anastomosing hemangioma (AH) is a rare benign hemangioma that predominantly occurs in the genitourinary system and retroperitoneum, and with a low incidence rate in the liver. Most cases have difficulty making a clear diagnosis before surgery and are prone to misdiagnosis. This case report aims to enhance the understanding of the occurrence of rare AHs in the liver and reduce unnecessary clinical interventions. Patient concerns: A 55-year-old male presented with a lesion in the left lobe of the liver during physical examination, which was surgically removed 1 week later. All the liver-related tumor indicators of the patient were negative. Diagnoses: The preoperative imaging examination diagnosed the lesion as a vascular tumor, and the AH was confirmed by pathological examination. Interventions: The patient underwent laparoscopic resection of the left lobe liver tumor and abdominal exploration and routine computed tomography follow-up. Outcomes: The patient recovered well after surgery, and the computed tomography scan 4 months after surgery showed no recurrence of the lesion. Lessons: For a single lesion in the liver with imaging manifestations of vasogenic tumors, when the imaging features and laboratory examinations lack specificity, the possibility of an AH should be considered.