The new imaging techniques used during the last several years: ultrasound, computed tomography and magnetic resonance imaging have improved detection of non-functional adrenal tumours s.c. "incidentaloma". Incidence of adrenal incidentaloma is not very low. They are detected in about 0.35-4.36% CT examination. In most of cases incidentaloma are benign and gave no clinical signs; however primary adrenal cortex cancer and metastases of different cancers are not uncommon. The primary adrenal lymphoma is an extremely rare disease. The predominant group of patients are men over 50 years with other manifestations of non Hodgkin lymphoma. Most frequently both adrenal glands are affected and signs of adrenal insufficiency (despite weakness, fever and loss of weight) are present. In our paper we present a case of primary, unilateral lymphoma in a 19 year old women. It was discovered as incidentaloma in ultrasound examination. Hormonal examinations were normal, but the tumour size was indication for surgery treatment. The diagnosis was made by histological examination and adjuvant chemotherapy was administrated.