What is a 4mm-T2 hyperintence lesion on left kidney?

A 4mm-T2 hyperintence lesion on the left kidney is a small area of increased signal intensity on T2-weighted magnetic resonance imaging (MRI) of the kidney. This could indicate a number of different things, including:

* A simple cyst: This is the most likely possibility. Simple cysts are fluid-filled sacs that are common in the kidneys and are usually benign.

* A complex cyst: Complex cysts have thicker walls and may contain debris or septae (dividing walls). They are less common than simple cysts and may be associated with an increased risk of kidney cancer.

* Renal cell carcinoma: This is a type of kidney cancer that can appear as a hyperintence lesion on T2-weighted MRI. However, renal cell carcinoma is rare in people under the age of 40.

* Other conditions: Other conditions that can cause a 4mm-T2 hyperintence lesion on the left kidney include:

* Hydronephrosis (swelling of the kidney due to obstruction of the urinary tract)

* Pyelonephritis (infection of the kidney)

* Renal infarction (blockage of blood flow to the kidney)

It is important to note that a 4mm-T2 hyperintence lesion on the left kidney does not necessarily indicate a serious problem. However, it is important to have it evaluated by a doctor to rule out any underlying medical conditions.