Raindrop skull In multiple myeloma The raindrop skull appearance of calvarial multiple myeloma is the presence of multiple, well-defined lytic lesions (punched out lesions) of various size scattered throughout the skull. This term is applied as an analogy to rain hitting a surface and splashing, where it leaves a random pattern of dark spots. https://t.me/joinchat/AAAAAEIMp_P_-52SlidzHg