Question

Chylous ascites is caused by all of the following except:

• A. Colloid carcinoma of stomach.
• B. Tuberculosis.
• C. Trauma.
• D. Nephrotic syndrome.

Hint:

True chylous ascites needs lymphatic blockage; mucinous gastric cancer instead gives gelatinous fluid.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
We need to find the one condition that is NOT a recognised cause of chylous ascites, a milky, triglyceride rich fluid that collects in the abdomen when lymphatic flow through the thoracic duct or its abdominal tributaries is blocked or torn.

Step 2: Key Concept:
Chylous ascites forms when chyle, the fat carrying lymph from the intestine, leaks into the peritoneal cavity instead of draining normally into the thoracic duct. Recognised causes include malignancy that blocks lymphatics (commonly lymphoma), tuberculosis with lymph node involvement, trauma or surgery that tears lymphatic channels, filariasis, and nephrotic syndrome, where lymphatic leakage can add to the ascitic fluid.

Step 3: Detailed Explanation:
Tuberculosis can involve mesenteric and retroperitoneal lymph nodes and block lymphatic drainage, producing true chylous ascites, so option 2 is a known cause.
Trauma, including abdominal surgery, can directly tear a lymphatic vessel or the cisterna chyli, spilling chyle into the peritoneum, so option 3 is a known cause.
Nephrotic syndrome is an accepted, if less common, cause of chylous ascites, linked to lymphatic abnormality and heavy protein loss, so option 4 is a known cause.
Colloid (mucinous) carcinoma of the stomach spreads through the peritoneum producing a thick, gelatinous, mucin rich fluid, similar to pseudomyxoma peritonei, this fluid is mucinous, not the lipid rich milky fluid of true chylous ascites. Gastric malignancy in general is not a classic cause of chylous ascites the way lymphoma or lymphatic trauma is.

Step 4: Why the other options are wrong:
Options 2, 3 and 4 are all established, textbook causes of chylous ascites, so they are correctly linked to the condition and are not the exception being asked for.

Step 5: Final Answer:
Colloid carcinoma of the stomach is not a recognised cause of true chylous ascites.
\[ \boxed{\text{Colloid carcinoma of stomach}} \]