It means that viewing the organ/biopsy/structure/whatever with bare eyes (and maybe hands too) didn't reveal anything out of the ordinary. The term "gross" is used in medicine to mean the opposite of "microscopic" (eg, gross anatomy is the study of anatomy at the level of whole organs and muscles, etc., whereas microscopic anatomy uses special instruments to study the cells and tissues that make up organs). "Unremarkable" is usually roughly synonymous with "normal" (eg, a physician's report might say that the head and neck exam was remarkable for swollen nodes, but the abdominal exam was unremarkable because nothing out of the ordinary was observed).
If you read the phrase on a biopsy report, you might consider asking your doctor what exactly that was referring to.
It means that there wasn't anything abnormal found on exam.
Grossly unremarkable means everything looked good during the exam that was done.
It means that there wasn't anything abnormal found on exam.
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In medical terminology the term gross means able to be seen with the naked eye, as in gross anatomy. So when a doctor says that something was grossly unremarkable, it means that they examined it without magnification, and didn't detect anything wrong with it. On the converse when a doctor says grossly abnormal, they looked at it ans were able to dect abnormal changes without needing to use a microscope.