🌿Onion skin appearance in spleen due to fibrosis - *SLE* 🌿Onion peel appearance of blood vessels of kidney - **Malignant hypertension ** 🌿Onion peel appearance of bile duct - **Primary sclerosing cholangitis ** 🌿Onion peel sign on X-ray - *Ewing sarcoma* 🌿Onion peel sign /cumbo sign/double arch sign - Sign of complete rupture /cyst degeneration in pulmonary hydatid cyst 🌿Onion skin sign in sonography- Appendiceal mucocele.