An 82-year-old myop and chronic glaucomatic treated intensively both topically and systematically underwent trabeculectomy on his left eye due to unsatisfactory intraocular pressureand significant glaucoma progression. There was persisting elevation of intraocular pressure in the early post-operative period, therefore sclera lap was discontinued and 5-fluorouracil was applied under the filter blister. Subsequent hypotonia caused a hemorrhagic suprachoroideal haemorrhage with intraocular hypertension. This was resolved by draining the blood with sclerotomias and releasing intraocular hypertension. Gradual improvement occurred in the visual acuity of the left eye to almost original values.