A right adrenal tumor was discovered incidentally in an ultrasonographic exam in a 45-year-old man. He was referred to our hospital for further examination and treatment of the adrenal tumor. The hormonal levels in his blood and urine were normal and hypertension was not observed. An ultrasonograph, computerized tomographic scan and magnetic resonance imaging showed a right adrenal tumor 7 cm in size. An adrenal hemangioma was most suspected, but a malignant tumor could not be excluded due to its size. Accordingly, a right adrenalectomy was performed. The histological diagnosis of adrenal hematoma was made. Adrenal hematoma is a rare disease in adults. It is very difficult to distinguish a large adrenal hematoma from a malignant tumor, the final diagnosis has to be made by histological study of the resected specimen.
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