Abstract
A 59-year-old woman was found to have an intra-hepatic hypoechoic mass in the left lateral segment of the liver on ultrasound. She had no symptoms. Abdominal CT scan with contrast media showed a 2 cm, hypoattenuating nodule with an unclear margin. The differential diagnosis, included intrahepatic tumor, gastro-intestinal stromal tumor, malignant lymphoma, and inflammatory pseudotumor. Since the possibility of a malignant liver tumor could not be completely excluded, a laparoscopic tumorectomy was performed. On pathology, a granuloma with an eosinophil infiltration was found. Anisakis larva were noted in the center of the lesion. As a result, the lesion was diagnosed as extra-gastrointestinal anisakiasis. Although most anisakiasis is characterized by severe abdominal pain, anisakiasis can be asymptomatic during the initial infection phase. Herein, we reported this rare case of extra-gastrointestinal anisakiasis presenting as an asymptomatic liver tumor.
