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Myelolipoma — Clinical Guidelines

Overview

Myelolipoma is a rare, benign neoplasm composed of mature adipose tissue and hematopoietic elements, typically found in the adrenal glands but also reported in the lungs, liver, and accessory adrenal glands 1 2 3 4 5 6 7 8.

Diagnosis

Clinical Presentation: Often asymptomatic, discovered incidentally as nodules on imaging 2 3 4.

Imaging: Characteristic findings on CT and ultrasound include fat-containing masses with heterogeneous density 5 6 7.

Pathology: Definitive diagnosis through histopathological examination with immunocytochemical staining 3.

Differential Diagnosis: Important to distinguish from other adrenal masses, including adenomas and lipomas 5.

Management

Surgical Intervention: Indicated for symptomatic lesions or when diagnosis is uncertain to exclude malignancy 4 5.

Observation: Asymptomatic lesions may be managed conservatively with regular imaging follow-up 2 3.

No Specific Medical Therapy: No pharmacological treatment is typically required 4.

Special Populations

Pediatrics: Can occur in children, as seen in a case with homozygous beta thalassemia 4.

Comorbidities: No specific management adjustments noted for comorbidities; management remains focused on the lesion itself 4.

Key Recommendations

Imaging for Diagnosis: Utilize CT and ultrasound for initial characterization of suspected myelolipomas (Evidence: Moderate 5 6 7).

Surgical Consultation for Symptomatic Lesions: Consider surgical excision for symptomatic or large myelolipomas to rule out malignancy (Evidence: Moderate 4).

Conservative Management for Asymptomatic Lesions: Asymptomatic lesions can be managed with surveillance imaging to monitor for changes (Evidence: Expert opinion 2 3).

References

1 Moore JL, Jackson CR, Ellis JC, Norrid C. You're the flight surgeon: myelolipoma. Aerospace medicine and human performance 2015. link 2 Sabate CJ, Shahian DM. Pulmonary myelolipoma. The Annals of thoracic surgery 2002. link03667-6) 3 Ziółkowski P, Muszczyńska-Bernhard B, Dziegiel P. Myelolipoma: the report of two cases in pulmonary location. Polish journal of pathology : official journal of the Polish Society of Pathologists 1996. link 4 Hadjigeorgi C, Lafoyianni S, Pontikis Y, Van Vliet-Constantinidou C. Asymptomatic myelolipoma of the adrenal. Pediatric radiology 1992. link 5 Ayuso JR, Ayuso C, Bru C, Vilana R, Bianchi L, Gilabert R. Ultrasonography and computed tomography in adrenal myelolipoma. Urologia internationalis 1991. link 6 Kageyama T, Doke Y, Takahashi M, Kaneko M. Computed tomography of myelolipoma in the accessory adrenal gland. Urologic radiology 1989. link 7 Kaurich JD, Coombs RJ, Zeiss J. Myelolipoma of the liver: CT features. Journal of computer assisted tomography 1988. link 8 Rubin E, Russinovich NA, Luna RF, Tishler JM, Wilkerson JA. Myelolipoma of the liver. Cancer 1984. link54:9<2043::aid-cncr2820540945>3.0.co;2-p)

Myelolipoma