[A case of hydronephrosis associated with appendiceal abscess].

An appendiceal abscess was complicated with right hydronephrosis in a 76-year-old woman who complained of general fatigue and fever. Ultrasonography demonstrated right hydronephrosis, and retrograde pyelography confirmed the hydronephrosis and showed ureteral stenosis. Computed tomography scan revealed a low-density area measuring 38 x 35 mm in size, anterior to the right ureter. Ureteroscopy and the biopsy of the mucosa was carried out, but malignant cells were not found. An exploratory laparotomy was performed. The mass had developed from the cecum and involved the ureter, requiring ileocecal excision, left partial ureterectomy and ureteric substitution with a Boari's flap. The histological diagnosis was an appendiceal abscess. The postoperative course was uneventful.