“Ganglioneuroma is a benign tumor arising from the sympathetic nerves or within the adrenals. This lesion is more frequently detected in the mediastinum or retro- peritoneum than in the adrenal medulla. Usually, it is a small round mass (2–3cm) with well-defined smooth margins and an inhomogeneous appearance due to myxoid components.”
Imaging features of adrenal masses 
Domenico Albano et al.
Insights into Imaging (2019) 10:1

“The computed tomographic (CT) findings in five adult patients with neuroblastoma and in one with ganglioneuroblastoma are presented. Four patients had abdominal and thoracic disease, one had abdominal disease only, and one had isolated chest involvement. The CT findings are nonspecific and may be confused with lymphoma. Nevertheless, multifocal presentation, particularly if it includes the posterior mediastinum and association with diffuse or focal bone involvement, when present, should suggest the diagnosis and lead to appropriate laboratory and histopathologic workup.”
Computed tomography of adult neuroblastoma.
Feinstein RS, Gatewood OM, Fishman EK, Goldman SM, Siegelman SS.
J Comput Assist Tomogr. 1984 Aug;8(4):720-6

“When an incidental adrenal mass is discovered at imaging, three important items to determine are a history of malignancy, presence of prior abdominal imaging, and symptoms of a hyperfunctioning mass, as this will guide subsequent management. First, if the patient has a history of malignancy, then an incidental mass has a higher chance of being a metastasis although the risk is still only 26–36%. Second, if prior imaging is available, greater than 1 year of stability is indicative of benignity. Third, if the patient presents with signs or symptoms of adrenal hyperfunction (including hypertension or Cushing’s features) this is suggestive of a biochemically active neoplasm that would require further investigation.”
Management of incidental adrenal masses: an update 
Daniel I. Glazer, William W. Mayo‐Smith 
Abdom Radiol (NY). 2020 Apr;45(4):892-900.