"found incidentally" is correct and can be used in written English.
It usually means that something was found unexpectedly or unintentionally. For example, "We found the lost book incidentally while cleaning the library."
Abnormalities of the posterior arch are rare entities that are usually found incidentally on neck radiographs.
In the majority of patients, lesions are found incidentally because they tend to be asymptomatic.
Heterotopic pancreas is a relatively common congenital anomaly, usually found incidentally during laparotomies.
And we have no clue how those tumors, the ones found incidentally, behave in real life.
Conclusion: This series represents the largest series to date regarding psammoma bodies that have been found incidentally during endometrial biopsy.
Although common, PTCs often are found incidentally because of the potential for these cysts to be asymptomatic.
If we sampled ten thousand asymptomatic women, we have no idea how many such malignancies would be found incidentally.
Objective: The purpose of this study was to elucidate the significance of psammoma bodies that are found incidentally during endometrial biopsy.
A renal transplant recipient with 13 years of excellent allograft function was found incidentally to have a malignant mass in his transplanted kidney.
In contrast to unmodified lignin, it was found incidentally that DML not only had excellent grinding performance, but also showed strong and unique retarding effect.
The nodules are often found incidentally during scans for more urgent medical problems and then ignored, even though they can be an early sign of lung cancer.
