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Although muscle metastases are rare in melanoma, there have been cases of patients experiencing muscle pain as a result of metastatic melanoma. In general, melanoma is a type of skin cancer that develops when melanocytes, the cells that give skin its colour, start to grow out of control. When cancer cells spread, it is called metastasis or metastatic melanoma. While most melanomas appear as visible lesions on the skin, there have been rare cases of melanoma presenting as muscle pain. In such cases, the melanoma has metastasized to the muscles, which can cause pain and other symptoms.
| Characteristics | Values |
|---|---|
| Muscle pain due to superficial spreading melanoma | Very rare |
| Common sites of melanoma metastasis | Skin, subcutaneous tissue, lymph nodes, lungs, liver, brain, bone, intestine |
| Rare sites of melanoma metastasis | Skeletal muscle, small bowel |
| Melanoma diagnosis | Usually made in the presence of an irregular skin patch or a change in a pre-existing patch |
| Muscle metastasis symptoms | Painful mass, swelling, weakness, unintentional weight loss |
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What You'll Learn
Superficial spreading melanoma is rare
Superficial spreading melanoma is the most common type of melanoma, a potentially serious skin cancer that arises from melanocytes (pigment cells) along the basal layer of the epidermis. It accounts for about 70% of all melanoma cases and tends to occur at sites of intermittent, intense sun exposure, especially on the trunk in males (40%) and the legs in females (also 40%). Spending a lot of time in the sun or in tanning beds is a major risk factor for superficial spreading melanoma.
Superficial spreading melanoma is highly curable when diagnosed early. It usually grows horizontally in the skin, presenting as a slowly enlarging flat area of discoloured skin. The average size of a superficial spreading melanoma is about 2 cm across. The main sign of superficial spreading melanoma is an unusual-looking spot that changes in size or appearance. It may resemble a freckle or mole, but it tends to be larger, often 1-2 cm in diameter at diagnosis.
While superficial spreading melanoma in situ is not dangerous, it can become life-threatening if an invasive melanoma develops within it. The risk of spread and death from invasive melanoma depends on several factors, but the main one is the thickness of the melanoma when it is surgically removed. The risk of metastasis is about 5% for tumours 0.75-1 mm thick and increases steadily with thickness. For melanomas >4 mm, the risk of metastasis is about 40%.
Although melanoma can spread to muscles, muscle metastases are rare in melanoma and cancer in general. The most common sites of melanoma spread are the skin, subcutaneous tissue, lymph nodes, lungs, liver, brain, bone, and intestine.
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Muscle pain can be a symptom
One case involved a 29-year-old woman, Daly, who experienced muscle pain in her shoulder, which was initially believed to be a muscle injury. Unfortunately, it turned out to be melanoma, and she succumbed to the disease. Another case mentioned in the British Journal of Plastic Surgery reported on a series of 15 patients with skeletal muscle metastasis, out of which only two cases were of melanoma. This highlights the rarity of skeletal muscle metastasis from melanoma.
Metastatic melanoma can spread to various parts of the body, including the lymph nodes, liver, brain, lungs, and bones. When melanoma spreads to the bones, it can cause pain in those affected areas. Additionally, metastatic melanoma can weaken the bones, making them more susceptible to fractures or breaks, particularly in the arms, legs, and spine.
While muscle metastases from melanoma are uncommon, they have been documented. A case report described a 43-year-old man with melanoma who presented with a painful swelling in the right buttock, which involved the gluteus maximus muscle. Another case mentioned in the same report involved a 41-year-old woman with a metastatic melanoma deposit in the temporalis muscle.
It is important to note that muscle pain can have various causes, and melanoma is only one rare possibility. If you are experiencing persistent muscle pain or other concerning symptoms, it is always best to consult a medical professional for a proper diagnosis.
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Melanoma usually spreads to other areas first
Melanoma is a type of skin cancer that develops when the cells that give skin its colour (called melanocytes) start to grow out of control. It is one of the most aggressive forms of skin cancer, accounting for about three-quarters of all skin cancer deaths. The diagnosis of melanoma is usually made in the presence of an irregular skin patch or a change in a pre-existing patch.
When melanoma spreads, it often goes to the lymph nodes first. Lymph nodes are located throughout the body, but large clusters are found in the neck, underarms, chest, abdomen, and groin. If the cancer has spread to the lymph nodes, they will usually feel swollen or even hard to the touch, but they will not be painful. Melanoma can also spread to other areas of the skin or to soft tissue, which includes muscles, nerves, fat, and blood vessels.
Invasion of striated muscles by melanoma is rare, but when it does occur, it usually presents as a painful mass. In the rare cases where melanoma has spread to the skeletal muscle, the most common site is the lower extremity, followed by the trunk musculature and the upper extremity.
If melanoma is not caught and treated early, it can spread throughout the body. The bones are considered a late-stage site of melanoma metastases, and the cancer will typically only spread to the bones after it has already spread to another area of the body first.
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Metastatic melanoma can cause bone pain
Melanoma is one of the most aggressive forms of skin cancer and accounts for about three-quarters of all skin cancer deaths. It is usually discovered from an irregular skin patch or a modification of a pre-existing patch. The diagnosis of melanoma is difficult in the absence of a skin lesion. Melanomas can metastasize to any organ, and the first sign of spread is usually in the distant skin, subcutaneous sites, and lymph nodes, followed by the lungs, liver, brain, bone, and intestine.
Metastatic melanoma typically spreads during stage 3 or 4. Common sites for metastases include the lymph nodes, lungs, liver, bones, and brain. Metastatic bone disease (MBD) carries significant morbidity for patients with cancer. The first symptom of bone metastasis is often bone pain, followed by bone fractures and elevated blood levels of calcium as the cancerous tumors in the bone break the bone down, releasing calcium into the bloodstream. Bone metastases from melanoma can be treated with bone-modifying agents such as denosumab or ZA, which may improve quality of life by delaying and reducing the occurrence of skeletal-related events (SREs).
If bone metastases become too painful to be controlled by medication, there is a non-invasive treatment to ease pain and slow the progression of bone metastases called MR-guided Focused Ultrasound (MRgFUS). MRgFUS starts with magnetic resonance imaging to identify the exact source of bone pain. This same imaging allows the physician to plan the non-invasive targeted delivery of ultrasound (sound waves) to the bone metastasis lesion. When the sound waves are aimed from several different directions at the lesion, they generate lethal heat at the point where they meet. Within 3-7 days after treatment, most patients experience significant pain reduction.
Muscle metastases are rare, and invasion of striated muscles is rare in melanoma and cancer in general. Muscle metastases usually present as a painful mass and may suggest a benign pathology. However, melanoma can spread to soft tissue, including muscles, nerves, fat, and blood vessels. The most common clinical setting in which a skeletal muscle metastasis has been observed is as the presenting symptom of a previously occult malignancy. Metastases to skeletal muscle are frequently painful.
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Treatment depends on the patient's wishes
Superficial spreading melanoma is a type of skin cancer that arises from melanocytes (pigment cells) along the basal layer of the epidermis. It is the most common type of melanoma, accounting for around 70% of all cases. It is highly curable when diagnosed early.
Treatment for superficial spreading melanoma depends on several factors, including the wishes of the patient. The patient's care plan is guided by the extent and depth of the melanoma. Treatment often involves surgery to remove the melanoma. If the melanoma is more advanced and has spread to other parts of the body, such as the lymph nodes or internal organs, immunotherapy, targeted therapy, chemotherapy, radiation, surgery, or a combination of therapies may be used to shrink the tumor.
The patient's wishes are taken into account when determining the treatment plan. For example, if a patient is opposed to surgery, alternative treatments such as radiation or chemotherapy may be considered. Additionally, the patient's preferences for the intensity and invasiveness of the treatment may be considered. Some patients may prefer a more aggressive approach, while others may opt for a more conservative treatment plan.
The patient's wishes may also influence the decision to pursue palliative care. For example, if a patient's melanoma has metastasized to skeletal muscle, causing pain and discomfort, the patient may choose to focus on palliative care to manage their symptoms rather than pursuing aggressive treatment.
Furthermore, the patient's wishes regarding their quality of life and overall goals of care are essential considerations. For instance, a patient may choose to forego treatment altogether and instead opt for comfort measures and supportive care if they feel that the potential benefits of treatment do not align with their personal goals or if they wish to avoid the potential side effects and impacts on their quality of life.
In conclusion, while there are standard treatment options for superficial spreading melanoma, the patient's wishes play a crucial role in tailoring the treatment plan to their individual needs and preferences. It is essential to involve the patient in the decision-making process and ensure that their values and goals are respected and addressed throughout their care journey.
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Frequently asked questions
It is rare for melanoma to show up as muscle pain since most cases appear as visible lesions on the skin. However, muscle metastases can occur, and they usually present as a painful mass.
Muscle metastases are rare in melanoma patients.
Muscle metastases usually present as a painful mass and may suggest a benign pathology.
Treatment options for muscle metastasis include no treatment, surgery for isolated tumour deposits, radiotherapy, chemotherapy, and possibly hyperthermia in conjunction with radiotherapy or chemotherapy.
The median survival after diagnosis of distant metastases in patients with melanoma is 6-7.5 months, and the 5-year survival rate is approximately 6%.
