The MOHS Surgery and Ambulatory Surgery Unit

The MOHS and Ambulatory Surgery Unit at the Shamir Medical Center (Assaf Harofeh) focuses on the removal of cancerous tumors or other lesions from the face and other parts of the body. The surgeries are performed mainly in ambulatory operating rooms, most under local anesthesia, though some are performed under general anesthesia depending on the size of the tumor. The MOHS technique is used as needed during tumor excision.

What Is a Cancerous Tumor?

A tumor defined as cancerous refers to a process in which a group of cells begins to multiply uncontrollably, without regulation of its size or growth rate. As a result, a localized mass may form, exerting pressure on vital functional organs and destroying normal structures in the area.
In later stages, tumor cells may detach and migrate through the body (via the bloodstream or lymphatic system), settling in other organs (such as the lungs, lymph nodes, brain, bones, and more), a condition known as metastatic cancer.

Skin Cancers: BCC and SCC

These tumors are the most common malignant skin cancers among people with fair skin.
Factors contributing to their development include prolonged sun exposure from a young age, fair complexion, blue eyes, certain skin diseases, and other factors. These tumors primarily occur in the head and neck region (80–85%), though they may occur anywhere on the body.

  • BCC – The most common type of skin cancer. Its appearance can vary: a shiny raised lesion, a non-healing ulcer, a red patch, a pigmented lesion, or a scar-like area.
    The lesion grows slowly, rarely metastasizes, but can invade deeply or spread locally, causing significant damage.
  • SCC – A less common malignant skin cancer. It typically appears as a raised, fleshy lesion accompanied by an ulcer (wound), grows relatively rapidly, and often produces keratin. This lesion is more aggressive and can metastasize, primarily to lymph nodes.

Treatment Options for Malignant Skin Tumors include: standard surgical excision, lesion shaving, lesion cauterization, use of liquid nitrogen (cryotherapy), laser therapy, radiation, photodynamic therapy, and topical treatments such as Efudix (5FU) or Aldara.

Mohs Micrographic Surgery

This surgery was developed by general surgeon Dr. Frederic E. Mohs (1910–2002). During the procedure, the skin lesion is removed in a specific manner, and its margins are immediately examined under a microscope to ensure complete control. This technique is primarily used to treat skin cancers on the face, genitals, and fingers. The surgery is suitable for any patient diagnosed with skin cancer in these regions.