What characteristic is not typically associated with neurogenic tumors?

Neurogenic tumors are primarily derived from nerve tissue and commonly arise from the neural crest or peripheral nerve sheath, which is markedly different from tumors that originate from connective tissue, such as sarcomas. These tumors typically exhibit echogenic characteristics due to their composition.

When considering tumor characteristics, neurogenic tumors often display a heterogeneous appearance on ultrasound, which can result from various cellular components and stromal elements present within the tumor. They can lead to variable echogenicity, influenced by factors such as necrosis, cystic degeneration, or the presence of fibrous tissue. Additionally, neurogenic tumors frequently present in the paravertebral region, correlating with their neural origin and anatomical location.

Thus, stating that neurogenic tumors originate from connective tissue is fundamentally incorrect, as this mischaracterization sets them apart from tumors that do arise from connective tissues. This distinction clarifies why this is the characteristic not typically associated with neurogenic tumors.