Final answer:
If a lesion is only found in the MLO view, a craniocaudal (CC) view should also be done to provide another angle for evaluation, which may be complemented by additional imaging if necessary.
Step-by-step explanation:
If a lesion is only present in the mediolateral oblique (MLO) view, another projection that should be done is the craniocaudal (CC) view. The CC view provides a different angle, allowing radiologists or other medical professionals to see the breast tissue in another plane, which might help clarify the nature of the lesion. It is crucial to ensure a comprehensive examination of any potential abnormalities, and pairing the MLO and CC views is standard in mammography for this reason. If the lesion is not visualized on the CC view, additional imaging, such as spot compression or ultrasound, might be necessary for further evaluation.