Is the separation of the uterine line a teratoma?

Patient's question:

Hello, I had an induced abortion on April 29th and a D&C on May 2nd. Initially, I had some bleeding for a few days, which was similar to my regular period, and then it gradually decreased. However, on the 9th, I experienced more bleeding after masturbation. The next day, when I went to the hospital for a check-up, they said there was a separation of the uterine cavity and that there might be a teratoma. Is it really that serious? Today, I have a little bit of bleeding again, and the doctor suggested I follow up for a check-up.

Doctor's answer:

Ultrasound Description: The uterus is anteverted, with regular section morphology and normal size. The muscle layer shows uniform echoes, the endometrial line is centrally located, and the thickness is normal. No abnormal echoes are observed within the uterine cavity. In the left adnexa, a mixed mass measuring 555146 mm is visible, with internal echoes showing lipid-fluid stratification and clear boundaries. The right adnexal region shows no abnormalities.
Ultrasound Findings: Left adnexal mixed echo mass, suggestive of a teratoma. The uterus/right adnexa shows no significant abnormalities.
Color Doppler Transvaginal Ultrasound Results:
Ultrasound Findings: The uterus is anteverted, with a size of approximately 5.54.03.3 cm, normal morphology, uniform muscle layer echoes, a centrally located endometrial line, and an endometrial thickness of about 0.4 cm. No abnormal echoes are observed within the uterine cavity. The right ovary shows normal size, morphology, and structure, with no apparent space-occupying lesions in the right adnexal region. A cystic mass measuring approximately 5.55.45.1 cm is observed in the left posterior aspect of the uterus, with clear boundaries and smooth walls. The mass contains dense echoes and a "liquid-liquid level" sign. CDFI: Flow signals are observed around the cystic mass, but no significant internal flow signals are detected.
No free fluid is observed in the pelvis.
Ultrasound Findings: Left posterior uterine cystic mass, suggestive of a benign ovarian tumor (teratoma?). Cervical Nabothian cyst.

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