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[Aspiration and drainage for a gas-producing brain abscess causing delayed bleeding from the abscess capsule--a case report].

A 65-year-old man was admitted with the complaint of gait disturbance. CT scan revealed a low density lesion in the right parietal lobe. MRI was carried out 3 days after admission, the lesion showing low intensity on T1 WI and T2 WI. Gd-DTPA enhanced T1 WI showing abnormal enhancement surround it. CT scan then revealed a gas bubble in the lesion 12 days after admission, so we diagnosed it as gas-producing brain abscess and aspiration, drainage and irrigation with antibiotics were performed. Although, the brain abscess was reduced in size after the operation, the lesion expanded again 2 weeks after the operation. MRI was performed and the lesion showed iso-intensity on T1 WI and high intensity on T2 WI. Emergent aspiration and drainage were performed and uncoagulated old-hematoma-like matter such as chronic subdural hematoma was removed. As significant neovascularization with inflammatory cells had been detected in the capsule of the brain abscess, we suspected that aspiration and drainage surgery for brain abscess may cause delayed bleeding from the capsule of the abscess. We conclude that attention should be drawn to such a complication.