Malignant tumors have a appearance and an irregular surface. benign crab nerve polyp

Malignant tumors have a crab like appearance and an irregular surface. This is because malignant tumors are characterized by finger-like projections that resemble crabs. The name cancer also came from a Greek word karkinos which means 'crab'.

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it