Aggressive osteoblastoma of the left calcaneus in 29‐year‐old Japanese woman is reported. Her initial symptom was heel pain while walking. This was a primary calcaneal tumor, initially diagnosed as a benign osteoblastoma. After a 5‐year follow‐up (from the initial curettage), there was local recurrence. The histologic findings of aggressive osteoblastoma were confirmed after right lower leg amputation. The recurrent tumor was mildly aggressive to the talocalcanean joint and the retrocalcaneal area, without distant metastasis. The characteristics of the primary and recurrent tumors were examined by the radiologic, histologic, and electron microscopic procedures. Although there are questions about aggressive osteoblastoma, the authors believe that there are osteoblastic tumors of borderline malignancy between benign osteoblastoma and low‐grade osteosarcoma. The current case was an example compatible with an aggressive osteoblastoma with the proposed name of Dorfman classification Group 4.

SirWe report a case of suspicious cerebral ischemia after intravenous (i.v.) indigo carmine.An 81-year-old male was scheduled for transurethral resection of a bladder tumor (TUR-Bt) under general anesthesia. He was suffering from arteriosclerosis obliterans and poorly controlled diabetes mellitus. He was premedicated with oral roxatidine 75 mg, induced with fentanyl 100 mg, ketamine 30 mg and propofol 20 mg. After muscle relaxation with i.v. succinylcholine 30 mg, a laryngeal mask (ProSeal #3.0, LMA Ò , Intavent Orthofix, Maidenhead, UK) was inserted. Anesthesia was maintained with an infusion of propofol (4-6 mg/kg/h), ketamine (0.5 mg/kg/h) and intermittent vecuronium. In addition, ultrasound-guided right obturator nerve block was carried out with 0.75% ropivacaine 6 ml and 1% lidocaine 6 ml. Then to confirm the orifice of ureters, indigo carmine (20 mg/5 ml) was administrated i.v. A few minutes after its administration, the Address:

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