Cardiac Tumors

Cardiac Tumor Classification - Heart's Unwanted Guests

• Primary Tumors: Originate in heart; rare.
  • Benign (~75%):
    • Myxoma: Most common primary in adults; 📌 "M"yxoma = "M"ost common, "M"ainly in left "A"trium.
    • Rhabdomyoma: Most common in children; associated with Tuberous Sclerosis.
  • Malignant (~25%):
    • Sarcomas (e.g., Angiosarcoma): Most common primary malignant. Poor prognosis.
• Secondary (Metastatic) Tumors: More common than primary.
  • Spread from: Lung, breast, melanoma, lymphoma, leukemia.

⭐ Atrial myxomas, most common primary adult cardiac tumor, are often pedunculated, arising from fossa ovalis in left atrium.

Benign Cardiac Tumors - Myxoma & Mates

• Most common primary cardiac tumors. Myxoma is the most frequent overall in adults.

📌 Mnemonic for Myxoma: "Myxomas are MIXed up (gelatinous) and often LEFT hanging in the atrium (LA)."

Malignant Cardiac Tumors - Sarcoma Strikes

• Primary malignant cardiac tumors: Rare, aggressive. Sarcomas most common.
• Angiosarcoma: Most frequent type (~40%).
  • Predilection: Right Atrium (RA).
  • Behavior: Rapid growth, early metastasis (often lungs).
  • Prognosis: Dismal, median survival < 1 year.
• Other sarcomas: Rhabdomyosarcoma (children), fibrosarcoma.
• Symptoms: Dyspnea, chest pain, heart failure, arrhythmias, embolic phenomena.
• Diagnosis: Echo, CT, MRI. Biopsy for confirmation.

⭐ Angiosarcoma, the most common primary malignant cardiac tumor, often arises in the right atrium and may cause hemorrhagic pericardial effusion.

Metastatic Cardiac Tumors - Secondary Spread

• Significantly more common than primary cardiac tumors, occurring 20-40 times more frequently.
• Most frequent primary origins:
  • Lung carcinoma (often by direct extension)
  • Breast carcinoma
  • Malignant melanoma (high cardiac tropism)
  • Leukemia and lymphoma
• Pathways of spread:
  • Direct contiguous extension (e.g., lung, esophagus)
  • Hematogenous dissemination (e.g., melanoma, sarcomas)
  • Lymphatic spread
  • Intracavitary diffusion (e.g., renal cell carcinoma via IVC)
• Pericardium is the most common site, followed by myocardium, then endocardium.

⭐ Malignant melanoma has the highest relative incidence of cardiac metastasis among all tumor types.

Cardiac Tumor Diagnosis - Signs & Scans

• Clinical: Highly variable. Dyspnea, chest pain, embolic phenomena, arrhythmias, new murmurs. Constitutional symptoms (fever, weight loss).
• Imaging:
  • Echocardiography (TTE/TEE): First-line; identifies mass, location, mobility.
  • Cardiac MRI/CT: Superior tissue characterization, assesses infiltration.
  • Biopsy: Definitive diagnosis, often via surgery.

⭐ Most symptomatic cardiac tumors in adults are secondary (metastatic), commonly from lung, breast, melanoma, or lymphoma.

High‑Yield Points - ⚡ Biggest Takeaways

• Atrial myxoma: Most common primary cardiac tumor in adults; left atrium; ball-valve obstruction, emboli.
• Rhabdomyoma: Most common primary cardiac tumor in children; strong association with tuberous sclerosis.
• Metastatic tumors are the most frequent cardiac tumors overall (e.g., from lung, breast, melanoma).
• Carcinoid heart disease primarily involves right-sided valves (tricuspid/pulmonary stenosis/regurgitation).
• Papillary fibroelastoma: Common benign valvular tumor, often on aortic valve; risk of embolization.