Intrauterine Pregnancy with a Molar Component or Ectopic Pregnancy: The presence of amenorrhea and structured tissue discharge, especially in the context of no bleeding, could suggest a pregnancy complication. The structured tissue could be indicative of a molar pregnancy or products of conception in an ectopic pregnancy.

Retained Products of Conception (RPOC): After a miscarriage or abortion, some tissue might remain in the uterus, leading to discharge and amenorrhea. The structured nature of the discharge supports this possibility.
Endometrial Polyps: These growths in the uterus can cause irregular menstrual bleeding or amenorrhea and might lead to the passage of tissue-like material.
Cervical or Uterine Cancer: Although less common, these conditions can cause abnormal vaginal discharge and amenorrhea. The structured discharge could be a tumor or necrotic tissue.

Choriocarcinoma: A rare, aggressive form of cancer that can follow any pregnancy and presents with metastatic disease, often without a clear primary site. It's crucial to consider due to its high mortality rate if untreated.
Gestational Trophoblastic Disease (GTD): Includes conditions like hydatidiform mole, which can present with abnormal uterine bleeding or discharge and requires prompt diagnosis and treatment to prevent complications.

Asherman’s Syndrome: A condition characterized by the formation of adhesions or scar tissue in the uterus, often following uterine surgery, which can lead to amenorrhea and possibly the passage of tissue.
Uterine Sarcoma: A rare type of cancer that originates in the muscle and supporting tissues of the uterine walls, which could present with abnormal discharge and amenorrhea.