Cancer in which the site of the primary (original) tumor cannot be found. Most metastases from occult primary tumors are found in the head and neck.
What is an occult neoplasm?
Background. Occult neoplastic cells (ONCs) are the tumor cells floating in the lymph node sinuses, distant from the primary tumor, and supposed to be one of most reliable marker of prognosis.
What is occult invasive cancer?
Occult invasive cervical cancer (OICC) is sometimes incidentally found in surgical specimens after a simple hysterectomy (SH). This study was aimed at identifying a subset of patients with OICC who have a favorable prognosis. This patient group may not require adjuvant radiotherapy and other procedures.
Can you have cancer cells without having cancer?
The bottom line. We don’t all have cancer cells in our bodies. The sheer number of cells your body constantly makes means that there’s always the possibility that some may be damaged. Even then, those damaged cells won’t necessarily turn into cancer.
How common is cancer of unknown primary?
Cancer of unknown primary is a disease that has metastasized (spread) from another part of the body. The place where it began, also called the primary site, is unknown. These cases make up about 2% to 5% of cancers diagnosed in the United States. Thanks to better diagnostic tests, though, they are becoming less common.
What does clinically occult mean?
In the modern view, a breast carcinoma is clinically occult if it cannot be detected by ordinary clinical means – regardless of whether the lesion is still at the preclinical stage (occult early carcinoma) or has already produced metastasis or nipple eczema as in Paget’s disease (occult late carcinoma).
Are neoplasms always malignant?
Neoplasms may be benign (not cancer) or malignant (cancer). Benign neoplasms may grow large but do not spread into, or invade, nearby tissues or other parts of the body. Malignant neoplasms can spread into, or invade, nearby tissues. They can also spread to other parts of the body through the blood and lymph systems.
What does occult mean in medical terms?
Occult: Hidden. For example, occult blood in the stool is hidden from the eye but can be detected by chemical tests.
What is neoplasm disease?
Neoplastic diseases are conditions that cause tumor growth — both benign and malignant. Benign tumors are noncancerous growths. They usually grow slowly and can’t spread to other tissues. Malignant tumors are cancerous and can grow slowly or quickly.
What is an occult lesion?
Occult malignant lesions, not clinically detectable, may be found by the study of surrounding tissue in the course of the excision of a benign lesion.
How long before precancerous cells become cancerous?
These aren’t cancer cells, but cells that may turn cancerous if left untreated for many years. It takes 10-15 years for pre-cancer to progress to cancer.
What is pre-cancer?
Precancer means changes to cells that occur before the cells become cancer. Vaginal cancer often begins with precancerous changes that may take place over many years. If not treated, the changes can turn into cancer over time.
What is the difference between cancer and precancerous cells?
Precancerous cells are abnormal cells that may arise in the colon, the skin, and many other parts of the body. They are not cancer cells, but neither are they normal cells. Most of these cells will not progress into a cancer. They have changed in ways that suggest it is possible, though, for a cancer to develop.
Where do most cancers of unknown primary occur?
Types of cells and cancer
Epithelial cells are found in the skin or tissues that line or cover the internal organs. Cancers that start in epithelial tissue are called carcinomas. Most cancers of unknown primary are types of carcinoma.
Does carcinoma mean malignant?
Carcinoma is a malignancy that begins in the skin or in tissues that line or cover internal organs. Sarcoma is a malignancy that begins in bone, cartilage, fat, muscle, blood vessels, or other connective or supportive tissue.
What are encapsulated cancer cells?
Encapsulated papillary carcinoma (EPC) is a rare malignant papillary breast tumor that, despite a lack of distinct myoepithelial layer, is considered an in situ carcinoma unless associated with a frank invasive component.