The words heterogeneous and heterogenous are commonly used in radiological and medical description and reporting. They are often incorrectly used interchangeably, as they have significantly different meanings.
Heterogeneous refers to a structure with dissimilar components or elements. For example a dermoid cyst has heterogeneous attenuation on CT. It is the antonym for homogeneous, meaning a structure with similar components.
Heterogenous refers to a structure having a foreign origin. For example heterogenous bone formation (to make matters worse, heterogenous bone formation is often heterogeneous too!).
- 1. dictionary.com
- 2. http://grammarist.com/usage/heterogeneous-heterogenous/