sinussal
The term "sinussal" is not a recognized word in standard English dictionaries or common scientific or medical terminology. It is possible that "sinussal" is a misspelling, a neologism, or a term specific to a particular niche field or context that is not widely known.
If "sinussal" is intended to relate to the sinus, it might be a derivative or an adjective
Alternatively, "sinussal" could be a misunderstanding or a phonetic spelling of a different word. Without further