Giant Left Atrial Myxoma in an Elderly Man : Case Report

Left atrial myxomas (LAM), the most common primary tumours of the heart are unusual or rare in the elderly. Moreover, elderly patients often present with non-specific symptoms that are frequently overlooked in the absence of a supporting cardiac history which makes an early diagnosis challenging. Herein, we reported large LAM in 70-year-old Iraqi Kurdish male who was presented with minimal obstructive symptoms and the diagnosis was not suspected clinically but discovered by trans-thoracic echocardiography (TTE) followed by successful surgical excision. Although atrial myxomas are benign, they have potential serious complications which mandate prompt therapy. Due to low morbidity and mortality besides its excellent outcome even in the elderly, surgery is the preferred choice of treatment for LAMs.


Introduction
Left atrial myxoma (LAM) is histologically benign and is the most common primary tumour of the heart [1].It accounts for 80% of all cardiac tumours [2].It could be seen in patients between 3 -83 years of age, with the majority presenting in fifth decade of life as sporadic cases (90%) and second decade as familial cases (10%) [3].Differential diagnosis of atrial myxoma includes pedunculated thrombus, metastatic sarcoma and melanoma in left atrium [3].Atrial myxoma in older people is considered to be unusual, but with the advent of newer imaging modalities and longer life expectancy, the incidence of myxoma in older people has increased [1].Atrial myxoma may be asymptomatic, in contrast, symptomatic cases may present with obstruction of cardiac blood flow, embolic phenomena and constitution symptoms [4].Elderly patients often present with non-specific symptoms that are often overlooked in the absence of a supporting cardiac history which makes an early diagnosis challenging [3].Herein, we reported large LAM in 70-year-old Iraqi Kurdish male who was presented with minimal obstructive symptoms and the diagnosis was not suspected clinically but discovered by trans-thoracic echocardiography (TTE) followed by successful surgical excision.The case is presented with review of the relevant literature.

Clinical Summary
A man of 70, a known case of reducible right inguinal hernia of 2 months duration was referred to Cardiology Department of Sulaimania Center for Heart Diseases (SCHD) on August 8, 2012 for evaluation of his cardiac status prior to general anaesthesia.He used to complaint of dyspnoea on exertion and dizziness for few years.His past medical history was insignificant and was an ex-smoker.Physical examination revealed right-sided reducible inguinal hernia of moderate size whereas cardiac examination displayed an irregularly irregular pulse with a rate of 100 bpm, Bp of 100/60 mmHg and an apical systolic murmur.The patient was previously prescribed digoxin and aspirin probably for a diagnosis of atrial fibrillation (AF).Blood tests were normal.ESR = 35 mm/hour.Chest radiograph was also normal.Electrocardiography (ECG) showed features of slow AF.TTE (Figures 1(a)-(d)) revealed big irregular mass occupying the entire left atrium (LA) with a pedicle attached to the left side of the inter-atrial septum prolapsing into the mitral valve (MV) in diastole.This appearance was omas can be multiple [3].Most myxomas produce symptoms when they weigh greater than seventy grams [3].LAM is considered giant, as in our case, when it occupies the entire LA [5].
Incidence: Atrial myxomas are found in approximately 14% -20% of the population [2].In Iraq, reported cases are few.Al Ani et al. reported a case of small right atrial myxoma 1 × 0.5 cm in size associated with Ebstein anomaly in a male of 45 which was not diagnosed preoperatively [6].Al-Obaidi and Al-kashaab posted a video demonstrating excision of LAM in Ibn-Albitar Center for Cardiac Surgery [7].
Age: With the advent of newer imaging modalities and longer life expectancy, the incidence of myxoma in older people has increased [1].A recent review reported 63 individuals with cardiac myxoma aged 68 to 88 [1].To the best of our knowledge, the oldest person with atrial myxoma who has undergone surgical resection was a Japanese man of 90 [1].
Symptomatology: Common symptoms include chest pain, dyspnea, orthopnea, peripheral embolism or syncope [2].However, atrial myxoma is among the great mimickers of clinical medicine.It should be put on a list of differential diagnoses for heart failure even in older people [1].Our patient had minimal obstructive symptoms (dizziness and effort dyspnoea).Both could be related to his age and therefore, they were overlooked.Associated AF might be a complication of LAM.
Diagnosis: Precise diagnosis of LAM on the basis of clinical findings is often not made in the elderly patient as the symptoms are often attributed to "generalized arteriosclerosis of the elderly" [8].In our case as in many previous reports, the diagnosis was not suspected clinically and was made later by TTE.LAM, although rarely observed in the elderly, may be diagnosed easily by means of echocardiography [9].
Treatment: The classical management and the only definitive treatment [3] of this disease is prompt surgical removal.However, there may be exceptions to this traditional dogma.Kay and Chow from Hong Kong reported an 85-year-old man with a calcified LAM and features of COPD and congestive heart failure managed conservatively as he considered cardiac surgery of high risk and refused operation.Moreover, there were no features of intra-cardiac obstruction, embolism or progressive growth on serial echocardiography [10].Anneka and Kumar believe that conservative management is of limited value in symptomatic patients with large myxomas.However, a conservative strategy with TTE/TOE monitoring & anticoagulation is favoured in high operative risk patients, asymptomatic patients, and slow growing atrial myxomas [3].In our case, despite minimal symptoms and advanced age, surgery was indicated due to the size of the tumour which may result in fatal valve obstruction at anytime and the high risk of cerebral emboli due to LAM combined with AF and the reported excellent outcome and low risk of surgery for LAM even in the elderly [11].
Morbidity and mortality: Cardiac myxomas in older people were surgically resected with mortality of 1.7% [1].
Prognosis: LAM, if left untreated, is inexorably progressive and usually fatal.In contrast, calcified left atrial myxoma may exhibit a quiescent phase.Tumor calcification, slow growth potential, and the absence of intracardiac obstruction may correlate with a better outcome in the elderly patient [10].

Conclusion
Atrial myxoma in older people is unusual.Elderly patients often present with non-specific symptoms that are frequently overlooked in the absence of a supporting cardiac history which makes an early diagnosis challenging.Surgery is the preferred choice of treatment for LAMs with excellent outcome even in the elderly.