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The Menstrual and Ischaemic Phases The menstrual phase, which lasts approximately 4-5 days is the initial phase of the menstrual cycle.

ENDOMETRIUM, BIOPSY: - FRAGMENTS OF DETACHED SQUAMOUS EPITHELIUM AND DETACHED NON-PROLIFERATIVE ENDOMETRIAL GLANDS.

Day 19 Few vacuoles, intraluminal secretions begin, no pseudostratification Day 20,21 Maximal secretion Stromal edema appears Day 22 Secretion still active , but subsiding Maximum stromal edema Day 23 Glands begins to show regressive changes Spiral arterioles become prominent Day 24 Regressive changes in the glands Predecidual cells begins to appear around the spiral arterioles Day 25 Marked regression Predecidual cells begins to appear beneath the surface epithelium Day 26 Marked regression Sheets of predecidual cells, few granular lymphocytes begin to appear Day 27 Marked regression More granular lymphocytes, focal necrosis DAY 28 Glands starts shedding, exhausted glands Necrosis and hemorrhage prominent.

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- SCANT BENIGN ENDOCERVICAL EPITHELIUM.

Day 24: Predecidua bridges multiple vessels• "Clinical usefulness of endometrial screening by ultrasound in asymptomatic postmenopausal women.

- RARE SQUAMOUS METAPLASTIC CELLS.

Endometrial histology and biochemistry in climacteric women during oestrogen and progestogen therapy.

Menstrual phase days 0 - 5 :• the midportion of the tissue menstrual endometrium.