Spontaneous intra-adrenal massive hematoma: possible extreme evolution of a non-secreting untreated adrenal adenoma.

The spontaneous adrenal hematoma is a rare event. An 83-year-old male patient presented a 26-cm asymptomatic retroperitoneal mass of doubtful renal-adrenal origin. He had been evaluated 10 years before for an adrenal incidentaloma of 2.3 cm and had refused surgery when it had reached 7 cm. Later, the mass enlarged to 26 cm and was surgically removed through an open anterior approach. The histopathology showed a solid 4 kg mass of fibrinoid-hemorrhagic material, partially necrotic, mixed with adrenal tissue, with a well-vascularized capsule. No relapse is present at 6-month follow-up. This is the largest case described of spontaneous intra-adrenal hematoma in a case with previous non-secreting adrenal adenoma. The hematoma (a 4 kg mass) developed 10 years after the first diagnosis and exposed the patient to potential damage of the surrounding organs and to high-risk abdominal surgery. Long-term follow-up of non-secreting adrenal adenomas should be recommended.