case_images: PMC10893774_01
case_images: Computed tomography scan. (A) Coronal section: The yellow arrow indicates at the base of the appendix an image with a soft tissue density of 25 Hounsfield units (HU). However, it is in close contact with some loops of the distal ileum, and its proximal portion is immersed in the cecum. This lesion has regular, well-defined borders. (B) Axial section: A neoplasm with dimensions of 11.4 x 3.7 x 3.45 cm does not show enhancement after the administration of the contrast medium without demonstrating streaking of adjacent fat or loss of the fat plane.
case_images: cureus-0016-00000052908-i01.jpg
case_images: PMC10893774_01_cureus-0016-00000052908-i01.jpg
case_images: FIG1
case_images: Suspecting a possible neoplasm and not finding diverticular disease, a CT was performed, revealing a lesion at the base of the appendix that projects into the cecum, well-defined, homogeneous, with calcified walls, suggestive of appendicular mucinous neoplasm (Figure 1).
case_images: Specimen of right hemicolectomy secondary to mucinous neoplasia of the appendix. Yellow arrows indicate a solid, soft consistency mass with irregularly calcified walls and a slight extension into the cecum, measuring 6.5 x 5.3 x 5 cm.
case_images: cureus-0016-00000052908-i02.jpg
case_images: PMC10893774_01_cureus-0016-00000052908-i02.jpg
case_images: FIG2
case_images: A right hemicolectomy with laparoscopic ileotransverse anastomosis was performed without complications (Figure 2).
case_images: PMC10893774_02
case_images: Computed tomography scan. (A) Coronal section: The yellow arrow shows a homogeneous cystic-appearing lesion with regular borders and irregular calcification of the walls at the appendicular base, extending to the cecum and terminal ileum without distant activity. (B) Axial section: A mucinous cystic neoplasm at the appendicular base measuring 13.2 x 6.4 x 4.4 cm with regular borders and calcified walls, without evidence of invasion into mesocolonic lymph nodes is seen.
case_images: cureus-0016-00000052908-i03.jpg
case_images: PMC10893774_02_cureus-0016-00000052908-i03.jpg
case_images: FIG3
case_images: A CT scan showed a well-defined, homogeneous lesion with calcified walls, dependent on the appendix, consistent with appendicular mucinous neoplasia (Figure 3).
case_images: Intraoperative findings. The yellow arrow points to an appendicular mucinous neoplasm with a firm consistency, not adhered to deep planes, and without invasion of other structures.
case_images: cureus-0016-00000052908-i04.jpg
case_images: PMC10893774_02_cureus-0016-00000052908-i04.jpg
case_images: FIG4
case_images: The patient underwent surgical intervention with a laparoscopic right hemicolectomy and ileotransverse anastomosis without complications (Figure 4).