Enchondroma

Disease Description (Causes and Symptoms)

• Definition: Enchondroma is a benign cartilaginous tumor in which cartilage tissue proliferates within the medullary cavity of a bone. It occurs mainly in the short bones of the fingers and toes (including the distal parts of long bones), and may present as a solitary or multiple lesion (e.g., Ollier disease).
• Causes·Pathophysiology: The cause is unclear. As cartilage matrix in the medullary cavity proliferates abnormally, it replaces bone or thins the cortex, weakening the bone. Multiple lesions (Ollier disease, Maffucci syndrome) are associated with a relatively increased risk of malignant transformation.
• Main symptoms:
  • Often discovered incidentally while asymptomatic
  • Swelling, localized pain, or bone deformity
  • Pathologic fracture caused by minor trauma in a pathologically weakened bone
  • Rarely, decreased sensation/paralysis due to nerve compression
• Diagnosis: Initial diagnosis is possible with a plain X-ray. If necessary, MRI (for very large lesions or suspected soft-tissue involvement), a bone scan, and, when malignancy is suspected, a biopsy (bone biopsy) may be performed.

Treatment Methods

• Observation (asymptomatic·small lesions):
  • If there are no symptoms or radiographic findings, management consists of regular imaging follow-up (e.g., X-rays at 6–12-month intervals).
• Surgery:
  • If symptoms (pain·fracture·functional impairment), an increase in size, or suspected malignancy is present, the standard treatment is curettage, followed by bone grafting (autologous bone or a bone substitute).
  • If malignant transformation is suspected, wide excision and oncologic treatment may be necessary.
• Fracture treatment:
  • If a pathologic fracture is present, fracture fixation and treatment of the lesion are performed together.
• Medications·Other:
  • Specific anticancer or drug treatment is generally not necessary for benign enchondroma (separate tumor treatment is required in the event of malignant transformation).
• Lifestyle management·Precautions:
  • Avoid excessive trauma or impact to the area with the lesion.
  • Immediate evaluation is necessary if pain or an increase in size occurs, or if new neurological symptoms (tingling·numbness) develop.
  • In cases of multiple lesions (Ollier disease·Maffucci syndrome), the risk of malignant transformation is increased, so more proactive follow-up is necessary.
• Complications (important):
  • Pathologic fracture, rare malignant transformation (chondrosarcoma), and recurrence (which may occur in some cases after curettage).

Checklist Before an Outpatient Visit (Including Items to Bring·Example Questions)

• Recommended items to bring:
  • A list of currently taken medications (including prescription drugs·supplements)
  • Previous medical records and relevant imaging (existing X-rays, MRI, bone scans, etc.)
  • Previous biopsy·surgery records (if any)
  • Notes on when symptoms began and their course (pain severity, frequency, aggravating factors)
  • Allergy history, particularly regarding anesthetics·antibiotics
  • Possibility of pregnancy (for female patients)
• Information useful to tell the doctor during the outpatient visit:
  • Location·nature of the pain (e.g., when it is worse during the day) and whether there is a history of trauma
  • Recent changes in the size of the lesion or functional impairment (such as limited movement)
• Example questions for the outpatient visit (questions patients may wish to prepare in advance):
  • "Is this test (or surgery) absolutely necessary? What are the alternatives?"
  • "If I have surgery, how long will the recovery period be? When can I return to daily activities·exercise?"

Examples of General Questions to Ask the Doctor

• "What is the risk of malignant transformation of this disease (enchondroma) into chondrosarcoma?"
• "In what cases is it acceptable to observe the condition without surgery?"
• "What is the likelihood of recurrence after curettage, and what additional treatments might be possible?"
• "What complications are expected with surgery, and what will the recovery process be like (hospitalization period, physical therapy, etc.)?"

Examples of Disease-Specific Questions

• "For a lesion in a long bone (e.g., the femur or humerus), is a bone biopsy necessarily required, unlike for a lesion in a finger?"
• "The current lesion is asymptomatic, but it is gradually increasing in size on X-rays. When (with what changes) would you recommend surgery?"

(If necessary, consult an orthopedic specialist in charge to establish a personalized diagnosis·treatment plan based on the imaging findings·medical history.)