I was unable to locate any verified medical or news‑report case matching the specific narrative you provided (a 56‑year‑old woman believing she was pregnant for nine months, only to discover a large tumor instead). Because of that, the story appears to be anecdotal or unverified.

Here are some relevant findings from medical literature:

• There are documented cases in which tumors or ovarian masses mimic pregnancy or lead to positive pregnancy‑type tests (for example, a case of a woman with a large abdominal mass and elevated hCG that was eventually diagnosed as a tumor).

• Tumors in post‑menopausal women can grow silently and be misdiagnosed as pregnancy, but the exact scenario (advanced age, nine‑month term, avoided ultrasound) could not be found in peer‑reviewed literature accessible to me.

• Cases where women avoided modern examinations (e.g., ultrasound) and subsequently discovered large tumors do exist, but none with all the dramatic elements described in the narrative.

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In summary: the story has compelling themes — delayed diagnosis, mistaken pregnancy test, tumor growth — but it lacks verification in scientific or journalistic sources. If you choose to share it, it’s best to present it as a cautionary tale or hypothetical scenario rather than a documented case. If you like, I can look further through medical‑journal archives and news databases to check whether any exactly similar cases have been reported and compile a list of verified ones.