Although hemangioma, which was our preoperative diagnosis, could also exhibit a tendency of volume increasing and contrast enhancement as a result of bleeding, the resected tumor in this case presented as a multilocular cyst filled with multiple yellowish papillary nodules, hypersecretion of clear mucin, and granular mucosa growing directly into the bile duct lumen.
Hepatobiliary cystadenocarcinoma is a rare cystic neoplasm that usually presents as a multilocular cystic mass with internal septations, nodules, and irregular, thickened cyst wall [ 1, 7, 8].
PCL ganglia have a more typical appearance and present as well-defined multilocular cysts adjacent to and along the dorsal PCL surface [1, 2, 8, 9].
As struma ovarii presents with a variety of non-specific appearances and usually manifests as a multilocular cystic ovarian mass with solid components of various amounts, the ultrasound typically demonstrates these non-specific heterogeneous solid cystic features [3].
The cystic RCC does not present as a solid mass, but rather as a unilocular or multilocular cystic mass that is composed of cancer cells growing in the form of cysts that are distinct from regular cysts (Figures 3I,J and S1).
Ruptured epidermoid cysts tend to present as multilocular lesions, with enhancement of the cyst wall due to fibrosis and giant-cell reaction to keratin, possibly mimicking malignancy [29].
On contrast-enhanced CT, parasitic cysts may present as unilocular or multilocular and can be found anywhere within the spleen.
The anterior mediastinal tumor was diagnosed as a multilocular thymic cyst pathologically.
With MR lymphography, retroperitoneal cystic lymphangioma appears usually as a multilocular mass.
It usually appears as a multilocular cystic lesion with a thin regular wall and several septations, lacking solid components and showing no significant enhancement after contrast administration (Fig. 4).
