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A Space-Occupying Lesion in the Liver Due to Capillaria Infection

A space-occupying lesion 3.5 by 2.0 cm in size caused by Capillaria infection was revealed ultrasonographically in segment 6 (S6) of the liver of a 32-year-old woman from Okinawa, Japan, who was hospitalized with a complaint of pain in the right upper quadrant. Laboratory examination showed leukocytosis of 10,400/mm³ with 22% eosinophils and slight impairment of liver function. The tumor was removed surgically and found to be a necrotic granuloma with eosinophilic infiltration formed around a degenerated nematode. The causative agent was presumed to be Capillaria hepatica based on the morphology of the bacillary bands and stichosome observed in the sectioned worm and in the fragments of worm recovered by dissecting the tumor tissue that was embedded in paraffin.