Sandbox:Trusha

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [2] Associate Editor(s)-in-Chief: Trusha Tank, M.D.[3]

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Cystic mass
Bronchogenic cyst	Abnormal ventral budding or branching of the tracheobronchial tree during embryologic development	Pleuritic chest pain Cough Hemoptysis Fever Pneumonia secondary to airway obstruction	+	-	-			CT scan: Spherical or oval mass Smooth outline Unilocular Noncalcified Demonstrating the size and shape of the cyst Determining its position in relation to other structures Bronchogenic cysts can mimic hydatid cysts Pneumonitis, pneumothorax, or empyema may present
Esophageal duplication cysts	Rare congenital gastrointestinal malformation	Chest pain Stridor Nonproductive cough Epigastric discomfort Vomiting Cardiac arrhythmia Retrosternal and thoracic back pain Cyst ulceration and bleeding Cyst rupture with secondary mediastinitis	-	+	-	Endoscopic ultrasound (EUS) Distinguish between solid and cystic lesions Periesophageal homogeneous-hypoechoic mass Multi-layered wall and well-defined margins Anechoic cyst if considerable central fluid present		Endoscopic ultrasound-guided FNA Atypical in appearance for duplication cysts Malignancy suspicion Endoscopy Indistinguishable from a lipoma, leiomyoma, a gastrointestinal stromal tumor (GIST), or other submucosal lesions
Thymic cyst	Congenital Unilocular Acquired Multilocular associated with: Teratoma Lymphoma Thymic carcinoma Autoimmune disorders	Asymptomatic	-	-	+	Biopsy with histopathology and cytology		CT scan: Oval shape Smooth contour Midline location Calcified Septate cyst Fluid attenuation
Mediastinal neurenteric cyst	Developmental foregut anomaly	Neurologic impairment Back pain Gait disturbance Sensory deficit Motor deficit Stridor Persistent cough	+			CT scan: Cystic nature of the mass Extent of the mass Vertebral anomalies		Postnatal chest X-ray: Posterior mediastinal mass with associated vertebral anomalies Ultrasound: Cystic nature of the mass
Lymphangioma	Turner syndrome Down syndrome Noonan syndrome Chronic lymphatic obstruction such as after surgery, infections or radiotherapy
Pancreatic pseudocyst
Chronic inflammatory disease
Churg-Strauss syndrome
Disease	Etiology	Symptoms	Dyspnea/ RI	Dysphagia	SVCS	Gold standard	Image	Additional findings
Posterior mediastinal mass
Central nervous system disease
Meningocele
Neurilemmoma
ABBREVIATIONS: N/A: Not available, SOB: Shortness of breath, M/C: Most common, RI: Respiratory insufficiency, NM: Neuromuscular system, SVCS: Superior vena cava syndrome, SLE: Systemic lupus erythematosus disease, T3: Triiodothyronine, T4: Thyroxine, TSH: Thyroid stimulating hormone, TFT: Thyroid function test

1. Superior vena cava obstruction
2. Partial anomalous pulmonary venous connection
3. Esophageal achalasia
4. Esophageal cancer
5. Esophageal rupture
6. Hiatus hernia
7. Hilar lymphadenopathy
8. Pneumomediastinum
9. Sarcoidosis
10. Lymphoma
11. Neurilemmoma
12. Non-Hodgkin lymphoma
13. Teratoma
14. Thymoma

1. Thyroid cancer
2. Goitre
3. Mediastinal germ cell tumor,
4. Mediastinal tumor,
5. Mediastinitis

1. Churg-Strauss syndrome
2. Bronchogenic cyst,
3. Dermoid cyst
4. Anthrax:
5. Tularemia

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CT scan showing a smooth anterior mediastinal mass, with a mixed internal density of containing both enhancing soft tissue and cystic areas. The outline of the mass is relatively well defined. No lymphadenopathy, pleural effusion or infiltration. Case courtesy of Dr. Abdallah Al Khateeb (Picture courtesy: Radiopedia)

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CT scan showing excessive fatty tissue deposition within the posterior mediastinum with anterior displacement of the esophagus. Case courtesy of Dr. Ahmed Abdrabou (Picture courtesy: [1])