LAMN with PMP and ovarian involvement. Contrast-enhanced coronal CT scan showing a mucocele of the appendix (solid arrow), with PMP involving the right paracolic gutter (arrowhead). Note also the cystic tumour in the left ovary (dashed arrow). Histological analysis after surgery revealed two mucinous tumours (a LAMN in the appendix and another in the left ovary), which overlapped morphologically. It is likely that the primary neoplasm arose in the appendix, subsequently extending to the ovary and peritoneum.