Myometrial Lesions: Understanding Uterine Muscle Growths from Fibroids to Cancer

A myometrial lesion is an abnormal growth in the uterine muscular layer (myometrium), ranging from benign to malignant.

Benign Lesions

• Leiomyomas (Fibroids): Common smooth muscle tumors; may cause heavy bleeding, pelvic pain, pressure, urinary/bowel symptoms.
• Adenomyosis: Endometrial tissue grows into myometrium; causes heavy bleeding, pain, cramping.

Malignant Lesions

• Leiomyosarcoma: Rare aggressive cancer from smooth muscle.
• Endometrial Stromal Sarcoma: From endometrial stromal cells, invading myometrium.
• Uterine Carcinosarcoma: Mixed glandular and stromal cancer; rare, aggressive.

Not all lesions are cancerous; consult a healthcare professional for evaluation if symptoms arise.