Medical Meaning of "Mass" vs. "Bulk"

In clinical medicine, a mass is a palpable or imaging-identified abnormal lump (e.g., tumor, cyst, hematoma). It is a structural finding, not a synonym for "bulk."

Bulk refers to volume, quantity, or aggregate size (e.g., "bulk laxative," "bulk tissue"). It is not a diagnostic term for a lesion.

Using "bulk" to define "mass" is inaccurate and potentially misleading in medical communication.