What is the difference between a typical and simple kidney cyst? i have a typical simple cyst of 1 cm on left kidney. i 'm male 31 years...

Atypical v simple: Simple cyst is a sac that contains clear liquid. It is usually benign. Atypical means non-typical. The contents here are not clear. It may contain old blood, fatty tissues, or solid tissue. We worry about possibility of solid tissue because it may be cancerous; hence, the follow up ultrasound which is designed to detect growth in order to allow for prompt intervention if needed.