This is Dr Basu, experienced Internal Medicine Specialist.
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The size of dermoid cyst is small and CA 125 is low.
This is not cancerous.
Hence this will not cause any GI symptoms.
Dermoid cyst is not ruptured --that id another reason why your GI symptoms are not related.
GI symptoms can be due to the food intolerance like gluten sensitivity, lactose intolerance, viral or bacterial or parasitic infections commonly.
Stool tests, gluten and lactose sensitivity tests should be helpful.
Please try to follow a low FODMAP diet meanwhile.
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