Localized depression with dense shadow of left kidney may be seen in left kidney stone, left kidney cyst combined with infected calcification and other diseases. 1. Left kidney stone: In general, ultrasound found that the left kidney localized depression with dense shadow is mostly due to the left kidney stone, usually due to the high concentration of uric acid and oxalic acid in the urine, and aggregated crystals in the left kidney, thus forming the left kidney stone. Generally, it can be treated by drinking more water in moderation, taking stone-removing drugs such as stone-removing granules, and surgery such as minimally invasive surgery. 2. Left kidney cyst combined with infection and calcification: after left kidney cyst combined with infection, the wall of the cyst may appear thickening phenomenon, and the cyst may also appear uneven density dark area. When the left renal cyst remains untreated for a long time and is combined with repeated inflammatory infections, the wall of the renal cyst will often appear calcification, and there may also be a localized depression with dense shadows in the left kidney. At this time, we should consult the doctor in time, under the guidance of the doctor to actively regulate the use of anti-infective drugs such as amoxicillin and other drugs and cyst surgical resection and other treatments. If you find the left kidney localized depression with dense shadow, we recommend that you consult a doctor in time, and follow the doctor’s instructions to standardize the diagnosis and treatment.