Which of the following are clinical indications for a submentovertex (SMV) projection of the skull?

The submentovertex (SMV) projection is specifically useful for visualizing the base of the skull, particularly in situations involving trauma to that area. One of the primary clinical indications for performing an SMV projection is to evaluate basal skull fractures. This projection allows for the visualization of the occipital bone and can help in identifying fractures involving the skull base that may not be easily seen on other projections.

The other options listed do not specifically align with the primary purpose of the SMV projection. For instance, while a depressed skull fracture might be visible on various other projections that focus more on the overall skull shape, a basal skull fracture requires detailed visualization of the base, which is best achieved through the SMV technique. Similarly, while a concussion affects brain function and may involve imaging of the skull, it isn't explicitly indicated for the SMV projection. Evaluation of skull sutures would generally utilize other types of projections that more directly assess suture lines rather than the base of the skull. Thus, the submentovertex projection stands out as particularly relevant for diagnosing basal skull fractures.