<prompt> Ca-wheel appearance on USG is seen in:Hydatid cystIntussusceptionHydatidiform moleAll  <response>: Hydatid cyst REF: Suttons radiology, 7th edition, volume 1 page 771 Signs of Hydatid cyst: Echinococcus Meniscuscrescentdouble arch sign: Floating membrane sign: Spoke wheelCa wheel appearance Cumbo sign Water Lilly sign: Camalotte sign: A cyst with an undulating membrane Serpent sign: No calcification in lung 