Pictures of fractures, perhaps

XRAYS

Think of the medical imaging technique that uses electromagnetic waves to reveal what’s hidden beneath the skin, often showing broken bones in black and white.

"Pictures of fractures" hints at medical images showing broken bones, which are commonly captured using X-rays. The word "perhaps" signals that "fractures" might not be the only thing X-rays show, but it’s the most direct link. The answer is simply the plural form of the imaging technique—XRAYS—since crossword answers are often in that format.