Referral
Subject: Urgent Referral for Evaluation of Mediastinal Mass in a Pediatric Patient
Dear Colleague,
I am writing to refer a 9-year-old female patient for your evaluation and management. She has been experiencing a recurrent cough and episodic fever for the past three months. Despite these symptoms, her routine laboratory investigations have returned within normal ranges, indicating no apparent inflammatory or infectious etiology based on standard blood tests.
A computed tomography (CT) scan of her chest, performed to investigate these persistent symptoms, has revealed the presence of a mass in the right middle lobe, along with underlying signs of bronchiectasis. The nature and implications of this mass are concerning and warrant further specialized investigation.
Given the complexity and potential severity of her condition, particularly the possibility of a lymphoproliferative disorder such as lymphoma, I am seeking your expertise in pediatric oncology for a comprehensive assessment and appropriate management.
The family of the patient has been informed about the seriousness of the findings and understands the need for specialized diagnostic procedures and potential treatment options that may follow.
Thank you for your prompt attention to this matter. We look forward to your guidance and expertise in managing this challenging case. Please do not hesitate to contact us if you need further details or have specific requirements prior to your evaluation of the patient.
Reply
Dear Colleague,
Thank you for referring the 9-year-old female patient for further evaluation of her persistent respiratory symptoms, including cough and a recent episode of hemoptysis. Your detailed referral has been instrumental in guiding our initial assessment and diagnostic approach.
Upon review, the patient has no significant history of recurrent infections or bleeding from other sites, and there is no indication of a foreign body inhalation as per parental reports. Her family and social histories are unremarkable.
Physical examination revealed that she is well, active, and does not exhibit any dysmorphic features. Her oxygen saturation is stable at 95% on room air. There are no signs of pallor, jaundice, or cyanosis. Respiratory assessment indicated decreased air entry in the right middle zone of the chest and mild lower crepitations, with the abdomen being lax and soft, and no organomegaly or lymph node enlargement observed.
Laboratory investigations including complete blood count, erythrocyte sedimentation rate, lactate dehydrogenase, and liver and renal function tests are all within normal limits.
Imaging with CT of the chest revealed multiple enlarged hilar and right para-tracheal lymph nodes, collapse consolidation, and liquefaction of the right lower lobe accompanied by moderate cylindrical bronchiectasis. The radiographic findings raise the possibility of lymphoma or tuberculosis.
Recommendations:
Based on these findings, we recommend further diagnostic tests to clarify the etiology of the mass and associated symptoms:
- Serum ferritin and LDH to assess inflammatory and turnover markers.
- Neuron-specific enolase and vanillylmandelic acid (VMA) in both serum and urine to rule out neuroblastoma.
- Alpha-fetoprotein (AFP) and beta-human chorionic gonadotropin (βHCG) to exclude germ cell tumors.
- Pelvi-abdominal ultrasound to assess for any additional masses or abnormalities.
- Pulmonary bronchoscopy and/or CT-guided biopsy of the mediastinal mass for histopathological evaluation.
Initial Impression
Our initial impression is of a mass causing bronchial obstruction, leading to secondary bronchiectatic changes. Differential diagnoses include lymphoma, teratoma, neuroblastoma, and the possibility of a retained foreign body.
Case Follow up
Following up on the diagnostic procedures, the tumor markers returned within normal ranges. Interestingly, bronchoscopy revealed an obstruction in the airway due to an impacted foreign body, which was successfully removed. This finding was unexpected given the initial clinical and imaging presentation, and it significantly alters the management plan and prognosis for the patient.
Discussion
Mediastinal masses encompass a diverse array of benign and malignant entities, presenting with a variety of symptoms stemming from either direct structural involvement or systemic effects related to the tumor or associated paraneoplastic syndromes. Common presenting symptoms include cough, chest pain, fever with chills, and dyspnoea. Localized symptoms often result from the tumor’s invasion or compression of adjacent mediastinal structures, leading to respiratory compromise, paralysis affecting limbs, diaphragm, and vocal cords, Horner syndrome, and superior vena cava syndrome.
The most frequent lesions encountered in the mediastinum are thymoma, neurogenic tumors and benign cysts, altogether representing 60% of patients with mediastinal masses. Neurogenic tumors, germ cell neoplasms and foregut cysts represent 80% of childhood lesions, whereas primary thymic neoplasms, thyroid masses and lymphomas are the most common in adults.
Systemic symptoms are typically a consequence of the aberrant production of hormones, antibodies, or cytokines by the tumor. In the diagnostic work-up of anterior mediastinal masses, tumor markers play a pivotal role, especially when thymoma or germ cell tumors are suspected. For instance, the presence of anti-acetylcholine receptor antibodies can indicate the association of thymic tumors with myasthenia gravis. Similarly, elevated levels of alpha-fetoprotein (AFP) or beta-human chorionic gonadotropin (β-HCG) typically suggest the presence of germ cell tumors.
Computed tomography (CT) stands as the most crucial imaging modality for the evaluation of mediastinal masses. CT imaging allows for detailed characterization based on the specific attenuation properties of air, fat, water, and calcium within the mass. High-resolution multiplanar reformation images are particularly useful as they provide a detailed depiction of the tumor’s anatomical relationships with adjacent structures, aiding significantly in planning both diagnostic and therapeutic approaches.
The management of patients with mediastinal masses requires a definitive diagnosis, which is generally contingent upon obtaining an adequate tissue sample. This can be achieved through biopsy or as part of a therapeutic surgical intervention. The approach to biopsy can vary, ranging from less invasive techniques like CT-guided needle biopsy to more invasive surgical biopsies depending on the mass’s location and the clinical scenario.
Conversely, the presence of a foreign body in the mediastinum, particularly sharp objects, poses an urgent surgical challenge due to the potential risks of causing severe complications such as foreign body and air embolism, as well as cardiorespiratory and vascular complications. Even if initially asymptomatic, foreign bodies that are lodged in a ‘safe’ plane within the mediastinum may remain dormant until infection, further migration, or other complications occur, necessitating prompt and careful management.
Given the complexity and potentially severe implications of mediastinal masses, a thorough and multidisciplinary approach is crucial for optimal patient outcomes. This includes collaboration among thoracic surgeons, radiologists, oncologists, and other specialists as needed, ensuring comprehensive assessment and management tailored to the individual patient’s needs.
Check the correct answers.
Question-1:
Correct Answer: D) Carcinoembryonic antigen (CEA)
Explanation: In the context of anterior mediastinal masses, anti-acetylcholine receptor antibodies are often elevated in patients with thymic tumors associated with myasthenia gravis. Alpha-fetoprotein and beta-human chorionic gonadotropin are typically elevated in germ cell tumors, which can also present in the anterior mediastinum. Carcinoembryonic antigen (CEA), however, is not a common marker for thymic tumors or germ cell tumors and is more frequently associated with adenocarcinomas of gastrointestinal origin, making it the least likely to be elevated in this scenario.
Question-2:
Correct Answer: A) Ganglioneuroma
Explanation: The patient’s age, the location of the mass in the posterior mediastinum, and the presence of calcification are key diagnostic clues. Neuroblastoma is a common pediatric tumor but typically presents more aggressively and not as a well-defined, calcified mass. Ganglioneuroma, on the other hand, is a benign tumor often arising from nerve sheaths, and it can present as a calcified mass in the posterior mediastinum in children, making it the most likely diagnosis in this scenario. Hodgkin’s Lymphoma and Bronchogenic cyst are less likely given the characteristics of the mass and the normal tumor marker levels.
References
- Laurent F, et al. Mediastinal masses: diagnostic approach. Eur Radiol. 1998; 8:1148–1159. doi: 10.1007/s003300050525.
- Takahashi K, et al. Computed tomography and magnetic resonance imaging of mediastinal tumors. J Magn Reson Imaging. 2010; 32:1325–1339. doi: 10.1002/jmri.22377.
- Brock MV, Mason DP, and Yang SC. Chapter no.7, Thoracic trauma. In, Frank W. Sellke, Sabiston & Spencer Surgery of the Chest, 7th edition, volume I, Philadelphia, and Elsevier Saunders. 2005; 91–100.
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