by Jason Wasserman MD PhD FRCPC
March 25, 2022
Basaloid neoplasm is a general term used to describe an abnormal growth (a neoplasm) made up of cells that look dark blue when examined under the microscope. The cells in the growth, or neoplasm, are called basaloid because they look similar to the basal cells normally found at the bottom of a thin layer of tissue called the epithelium. Basaloid neoplasm is considered a general term because it includes many different types of benign (non-cancerous) as well as malignant (cancerous) growths.
The look of a basaloid neoplasm under the microscope
No. There are many types of basaloid neoplasms that are benign (non-cancerous). By examining the tissue under the microscope and performing additional tests such as immunohistochemistry, your pathologist will decide if the basaloid neoplasm is benign or malignant (cancerous).
Pathologists often use the term basaloid neoplasm when describing a small tissue sample that is excised through a biopsy. In this instance, there may not be enough tissue available for the pathologist to make a final diagnosis and the term basaloid neoplasm is used to provide a preliminary diagnosis that your doctors may use to start planning your care. The term basaloid neoplasm may also be used after an entire tumour is removed and the tumour shows features that may be seen in more than one kind of tumour.