Large renal cortical cyst, sonography

* Ultrasound:

    * Anechoic (fluid-filled) lesion with well-defined margins and a thin wall.

    * Posterior acoustic enhancement (increased echogenicity behind the cyst).

    * Few, thin septa may be present (normal in up to 5% of simple cysts). In this case, no septae seen. 

    * No internal echoes or echogenic debris (suggestive of complexity).

* **Color Doppler:

    * Avascular (no blood flow within the cyst).

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Sonography of kidneys

**Prognosis:

* Simple renal cysts, like the one described here, are generally benign and have an excellent prognosis.

* The size of the cyst itself does not necessarily indicate malignancy.

* Long-term follow-up is usually not required unless the cyst grows significantly or causes symptoms.

**Management:**

* Most simple renal cysts do not require treatment.

* Observation is typically the recommended approach.

* If the cyst causes pain, infection, or other complications, intervention might be considered.

    * Options include aspiration (needle drainage), sclerotherapy (injection of a substance to shrink the cyst), or surgery in rare cases.

Remember, this information is for educational purposes only and should not be interpreted as medical advice.