Adrenal gland tumors are found in 4-10 % of the world's population. In recent years, the incidence has been increasing due to aging and more frequent use of diagnostic imaging methods such as CT and MRI. Proliferations of the adrenal cortex include diffuse adrenal cortical hyperplasia, adrenal cortical nodular disease, adrenal cortical adenoma and adrenal cortical carcinoma. The most commonly discovered neoplasms are non-functional adenomas of the adrenal cortex. They are asymptomatic and most are discovered incidentally during investigations for other reasons. Symptoms develop when there are functional tumors that lead to excessive hormone secretion. Unlike adenomas, adrenal cortical carcinomas are rarer, more aggressive in growth with a high mortality rate and require more complex treatment. Based on different morphological characteristics, they are classified into conventional, oncocytic, myxoid and sarcomatoid subtypes. Advances in the fields of endocrine pathology, endocrine oncology, and molecular biology have led to the development of a new classification by the World Health Organization (WHO) for tumors of the adrenal cortex, pheochromocytoma and paraganglioma, published in March 2022. According to the new official classification, a pheochromocytoma is defined as an intra-adrenal paraganglioma and is classified within the group of paragangliomas, along with sympathetic and paragangliomas of the head, neck, and abdomen, as well as parasympathetic paragangliomas. The aim of this review paper is to describe the most common primary tumors of the adrenal gland from a morphological, immunohistochemical and cytogenetic perspective and to present the enhanced histological, genetic and diagnostic knowledge contained in the new 2022. WHO classification.