Decompression hyperostosis: cranial hyperostosis mimicking bilateral subdural hematoma on brain scintigraphy.

Scintraphic findings suggestive of bilateral subdural hematoma developed after successful decompression of communicating hydrocephalus. These findings were secondary to cranial hyperostosis. The similarity of brain scintigraphic findings in the two disorders is pointed out, and the necessity of correlating brain scintigraphs is stressed.