Surgeons Discover Jelly-Like Tumor Originating from Appendix During Hernia Evaluation

A 53-year-old man sought surgical consultation for a supraumbilical hernia and persistent abdominal pain lasting several months. He had also shed approximately 10 kilograms (22 pounds) and suffered from chronic constipation.

Imaging revealed complications. Ultrasound detected abdominal fluid and omental thickening. CT showed an irregular liver contour, which in a patient with type 2 diabetes might have been dismissed as early fatty liver disease — a plausible but incorrect assumption.

At surgery, the abdominal fluid proved atypical: thick, jelly-like mucin with nodules scattered across peritoneal surfaces. The case was published February 27 in Cureus by clinicians from the University of Sharjah and Kuwait Hospital in the United Arab Emirates.

The Condition That Fills the Abdomen with Jelly

Pseudomyxoma peritonei develops when mucin-producing tumor cells disseminate across the peritoneal lining and continue secreting. Mucin accumulates, pressure builds, and organs become compressed.

Clinicians refer to it bluntly as “jelly belly,” the term the authors used in print.

The disease is genuinely rare — roughly one to two cases per million annually — with the appendix as the most common source. Laparoscopy revealed an abnormal, nodular appendiceal tip, and pathology confirmed a low-grade appendiceal mucinous neoplasm (WHO grade I). Omental and peritoneal nodule biopsies showed low-grade mucinous neoplasia.

Mean onset age is around 53, and the condition is slightly more prevalent in women. In men, it typically stems from a ruptured mucinous appendiceal lesion.

Grading carries real clinical weight. An international expert panel established a standardized classification distinguishing low-grade from high-grade mucinous carcinoma peritonei, with substantially different prognoses and treatment intensities. This patient’s disease was low-grade.

The Hernia Was a Clue, Not a Coincidence

The supraumbilical hernia that prompted the visit is the detail the authors emphasize.

New-onset hernias are a recognized, though uncommon, presentation of pseudomyxoma peritonei; at least one prior report described a recurrent incisional hernia caused by the condition. The mechanism is straightforward: mucin accumulating in a closed cavity steadily raises intra-abdominal pressure until the abdominal wall yields at its weakest point. His CT also identified four small paraumbilical hernias, each about 5 millimeters.

Diagnosis is frequently delayed because distension, altered bowel habits, appetite loss, and weight loss are nonspecific. With abdominal fluid, chronic liver disease is a far more common explanation. Many cases surface incidentally during unrelated surgery.

The Signs Radiologists Look For

Three imaging findings steered suspicion away from liver disease and toward the peritoneum.

Omental caking — thickening of the fatty apron draping abdominal organs — appeared on ultrasound and MRI with restricted diffusion. MRI also showed septated peritoneal fluid collections. Hepatic scalloping, described by the authors as the most characteristic radiological sign, produced indentations on the liver surface from pressing mucin.

Contrast-enhanced CT distinguishes mucin from ordinary fluid by attenuation: mucin shows low-attenuation areas intermixed with denser solid tumor elements.

Tumor markers offered partial clarity. CA 19-9 and alpha-fetoprotein were normal. CEA was elevated at 10.2 to 18.0 ng/mL against a reference ceiling below 3.8 — roughly three to five times the upper limit. The authors note low-grade disease generally produces more modest CEA rises than high-grade disease.

Still, imaging and blood work were insufficient. The differential included peritoneal carcinomatosis, tuberculous peritonitis, and peritoneal mesothelioma. Only tissue provided a definitive answer.

What Happens Next for Patients Like Him

Untreated, pseudomyxoma peritonei can progress fatally through bowel obstruction, malnutrition, and infection.

The standard of care is cytoreductive surgery combined with hyperthermic intraperitoneal chemotherapy — heated chemotherapy circulated inside the abdomen after visible tumor removal. A 2025 multisociety consensus statement formally evaluated the evidence behind this combination. Cited studies report five-year survival of 62 to 80 percent after complete cytoreduction plus heated chemotherapy, with low-grade disease carrying the better outlook.

This patient recovered without incident from diagnostic laparoscopy, appendectomy, and biopsies, then was referred to a specialized oncology center for combined treatment. He returned weeks later with left-sided kidney colic, and repeat imaging still showed ascites, omental thickening, and hepatic scalloping.

The authors stress “the importance of maintaining a high index of suspicion” in patients with unexplained abdominal fluid, increasing girth, and abdominal wall hernias. This is one patient’s experience and does not establish how often hernias signal the condition. Anyone with a persistently swelling abdomen, unexplained weight loss, or a new hernia should seek evaluation rather than assume a familiar explanation fits.

Key Questions Answered

What is pseudomyxoma peritonei? A rare condition in which mucin-producing tumor cells spread across the abdominal lining and continue secreting thick mucinous material, enlarging the abdomen and compressing organs. Clinicians nickname it “jelly belly.”

How rare is it? Estimated at one to two cases per million annually. Mean onset age is around 53, and it occurs slightly more often in women than men.

Where does it come from? Most often from a low-grade mucinous neoplasm of the appendix. Less commonly from the ovary, colon, urachus, or other sites. In women, ovaries are frequently involved secondarily to an appendiceal primary.

Why is a hernia significant here? Mucin buildup raises internal pressure over time, which can push the abdominal wall open at a weak point. New-onset hernias are an infrequent but recognized presentation.

How is it diagnosed? Imaging findings — omental caking, septated fluid collections, hepatic scalloping — raise suspicion, but definitive diagnosis requires direct visualization and tissue biopsy. CEA supports diagnosis and monitoring.

What is the treatment and outlook? Cytoreductive surgery combined with heated intraperitoneal chemotherapy is the standard. Cited studies report five-year survival of 62 to 80 percent after complete cytoreduction, with low-grade disease carrying the better prognosis.

Source link