Erythema gyratum repens  is a figurate erythema that is rapidly moving and usually a marker of underlying cancer,: 143  usually from the lung. See also
Annular erythema of infancy
List of cutaneous conditions
List of cutaneous conditions associated with internal malignancy
List of migrating cutaneous conditions

References
Further reading
Prouty, Megan; Liu, Deede (2019). "Erythema Gyratum Repens Associated with Anal Cancer". New England Journal of Medicine. 380 (3): e3. doi:10.1056/NEJMicm1805833. ISSN 0028-4793. PMID 30650327. Illustration of the condition


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Diagnosis
Ganglioneuromas can be diagnosed visually by a CT scan,  MRI scan, or an ultrasound of the head, abdomen, or pelvis. Blood and urine tests may be done to determine if the tumor is secreting hormones or other circulating chemicals. A biopsy of the tumor may be required to confirm the diagnosis. Treatment
Because ganglioneuromas are benign, treatment may not be necessary, as it would expose patients to more risk than leaving it alone.If there are symptoms or major physical deformity, treatment usually consists of surgery to remove the tumor. Prognosis
Most ganglioneuromas are noncancerous, thus expected outcome is usually good. However, a ganglioneuroma may become cancerous and spread to other areas, or it may regrow after removal.If the tumor has been present for a long time and has pressed on the spinal cord or caused other symptoms, it may have caused irreversible damage that cannot be corrected with the surgical removal of the tumor. Compression of the spinal cord may result in paralysis, especially if the cause is not detected promptly. References


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