Introduction 

Tumoral Calcinosis (TC) is a rare benign disease characterised by large soft tissue masses composed of calcium deposits forming around the joints, usually in the periarticular soft tissues. These deposits may form non-cancerous tumour-like lumps that cause discomfort and restriction of movement. Most of the time, TC is seen around the elbows, hips, and knees, but it can occur anywhere in the body. TC may affect all age groups, though it is more common in patients with underlying renal disease and also genetic disorders. Management includes medication, lifestyle modification, and sometimes surgery.^1,2

Pathophysiology

The pathophysiology of TC involves calcium and phosphate dysregulation, normally controlled by parathyroid hormone (PTH), vitamin D, and fibroblast growth factor 23 (FGF23), resulting in soft tissue calcifications. It creates mechanical tension and subsequently causes painful, limited mobility. As these calcifications grow, they may compress muscles, tendons, and joints, resulting in further discomfort and inflammatory reactions. Various factors lead to this impairment, including most notably:^3,4,5,6,7

• Hyperphosphatemia: due to the very high levels of phosphate in the blood that result in calcium phosphate deposits
• Genetic factors: mutations such as GALNT3 decrease FGF23, thereby impacting phosphate balance
• Impaired renal function: reduction in renal function leads to insufficient phosphate excretion
• Altered vitamin D metabolism: abnormal vitamin D metabolism increases calcium levels

Secondary infections and neuropathy can also give rise to various symptoms, such as tingling, numbness, or pain.⁴

Clinical significance and pain

TC is often asymptomatic in early stages but may cause pain, swelling, and reduced joint mobility as calcifications grow. Large masses can pressure surrounding tissues, leading to discomfort and functional impairments.TC pain results from chronic inflammation and nerve sensitisation. Further, sensitisation of nerves can increase pain sensitivity, even from small stimuli. Thus, it is the mechanical stress, along with inflammation and involvement of the nerves, that leads to chronic pain among those suffering from TC.

The goals of pain management in TC are to restore the quality of life and preserve joint function. Strategies may include pharmacological interventions, physical therapy, and occasionally surgery.^1,8,9

Evaluation and diagnosis

Clinical assessment

Assessment begins with patient history, specifically the onset of pain, duration, and functional impairment. The physical examination will focus on soft tissue masses and the assessment of joint mobility and tenderness. The nature of the pain, its severity, location, and character, such as sharp, aching, or throbbing, dictates further management.¹

Imaging

Imaging techniques play a very important role in the diagnosis of TC. X-rays can help identify calcific deposits, whereas CT scans and MRI give detailed views of the masses that are useful in assessing the size and location of the mass and its effect on surrounding structures. MRI is especially helpful in detailing soft tissue involvement and the degree of inflammation.¹⁰

Laboratory investigations

Blood tests play a role in determining the underlying metabolic disturbance. Serum calcium, phosphate, and PTH are analysed to diagnose calcium-phosphate balance and its potential causes of dysregulation. Genetic testing, including but not limited to GALNT3 mutation, is an important means of diagnosing familial forms of TC that may help in the approach to management and treatment.^1,3

Management strategies

Non-pharmacological approaches

• Physical therapy and rehabilitation: range-of-motion exercises prevent a decline in joint mobility and stiffness due to calcification. Orthotics or protective devices also aid in distributing pressure away from the affected areas, reducing discomfort and preventing further injury¹¹
• Lifestyle modifications:
  • Dietary changes: a diet low in phosphate, excluding dairy and processed meats, prevents hyperphosphatemia and subsequent calcification¹²
  • Good hydration: it helps to keep your kidneys functioning well and hence maintains a good calcium-phosphate balance. This will discourage further calcification of the tissues¹³

Pharmacological management

Pain relievers

• Nonsteroidal anti-inflammatory drugs (NSAIDs): such as ibuprofen and naproxen, can be used in managing pain and inflammation associated with TC. The objective of such medications is a reduction in the sensation of pain and swelling¹⁴
• Opioids: in cases of more severe pain, opioids can be prescribed for symptomatic treatment for a short period because the risk of addiction and other adverse side effects bars their long-term use¹⁵

Anti-inflammatory medications

• Corticosteroids: for short-term management of inflammation, particularly during exacerbation. However, it is usually prescribed for a limited duration of time to avoid long-term drug adverse effects like osteoporosis and immune suppression
• Biologic agents: Tumour necrosis factor (TNF) inhibitors, monoclonal antibodies against IL-1β have been used in biologic agents therapy of refractory inflammation to diminish inflammation and prevent further calcification¹⁶

Modulators of calcium-phosphate metabolism

• Phosphate binders: sevelamer is one of the drugs which reduce phosphate absorption from the intestine, thereby helping to regulate phosphate levels, avoiding further calcification in TC^17,18
• Vitamin D analogues: analogues, such as calcitriol, can help regulate calcium and phosphate metabolism, correcting any deficiencies and preventing further mineral imbalances¹⁹

Surgical interventions

The indication for the operation in symptomatic patients who present with major calcifications related to pain and severe restriction of movement is suggested. Other indications are severe neurological findings from nerve compression or repeated infection because of calcification that extends into the skin and may result in neurological impairment.^20,21,22,23

Types of procedures:

• Surgical excision: is the most common type of surgical procedure, where the calcified mass is excised. Surgery relieves the pain and allows restoration of function by removing a physical mass impinging on the surrounding tissues
• Debridement and reconstruction: in the case of severe tissue destruction and/or joint involvement, debridement-reconstruction may be indicated to preserve function and avoid recurrence

Emerging therapies

• Metabolic drug trials: new therapeutic approaches have been sought to target the basic metabolic disturbances in TC. There is a development of experimental drugs for better control of calcium and phosphate metabolism. Such drugs may target inhibition of phosphate absorption or modulate the activity of proteins such as FGF23^24,25
• Gene therapy potential: is another area of research that holds a lot of promise for TC. In those cases caused by genetic mutation, gene therapy may correct the basic genetic defect and restore the appropriate regulation of calcium-phosphate products. This would potentially provide a more permanent solution for individuals with familial forms of TC. Although gene therapy is still in its infancy, it holds tremendous promise for the future treatment of metabolic bone disorders such as TC²⁶

Multidisciplinary care approach

The management of TC is a collaborative approach. Rheumatologists manage metabolic features, nephrologists manage renal dysfunction and phosphate levels, pain specialists manage chronic pain, and surgeons perform surgery in cases of large calcifications or complications such as nerve compression. Such a collaboration provides holistic care with the best possible outcomes.^20,21,27,28

Monitoring and follow-ups

Regular assessments

Continuous monitoring is important in the management of TC. Monitoring of symptoms, pain, and any changes in pain or function helps in assessing the effectiveness of treatment. Regular imaging can monitor calcification growth and recurrence, hence guide interventions and prevent complications. Further follow-up allows for the identification and management of these adverse effects to provide optimal care.^1,10,12

Summary

• Tumoral calcinosis: a rare condition with calcium deposits around joints, associated with kidney problems or genetics, leading to pain and loss of mobility
• Causes: Imbalance in the metabolism of calcium and phosphate, commonly due to renal impairment or genetic mutations (GALNT3)
• Symptoms: Pain, swelling, and impaired mobility 
• Diagnosis: through imaging techniques like X-rays, CT scans, MRI and blood tests
• Management: physical therapy, medications (NSAIDs, opioids), and surgery for severe cases
• Care approach: multidisciplinary team (rheumatologists, nephrologists, surgeons) and lifestyle modifications
• Future treatments: gene therapy and metabolic drugs for better long-term care