Musculoskeletal · Chest Wall Deformities
The facts most likely to be tested
Pectus carinatum is a congenital chest wall deformity characterized by the anterior protrusion of the sternum and costal cartilages, often referred to as pigeon chest.
The condition is frequently associated with connective tissue disorders, most notably Marfan syndrome and Noonan syndrome.
Physical examination reveals a prominent sternum that is typically asymmetric and more pronounced on one side of the chest.
Most patients are asymptomatic and seek medical evaluation primarily for cosmetic concerns or psychosocial distress.
Severe cases may lead to restrictive lung disease or decreased exercise tolerance due to reduced chest wall compliance.
The first-line treatment for flexible deformities in adolescents is dynamic compression bracing to apply constant pressure to the protruding sternum.
Surgical correction via the Ravitch procedure is reserved for patients with severe, rigid deformities or those who fail conservative management.
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A 14-year-old male presents to the clinic for a routine sports physical. He is tall and thin with long, slender fingers. On physical exam, there is a noticeable anterior protrusion of the sternum with associated asymmetry of the costal cartilages. The patient reports no dyspnea, chest pain, or palpitations during exercise. His lung fields are clear to auscultation, and his heart sounds are normal.
What is the most likely diagnosis and the most appropriate initial management for this patient's chest wall deformity?
Pectus carinatum; dynamic compression bracing.
The patient presents with the classic 'pigeon chest' deformity associated with Marfanoid habitus; in a flexible adolescent, dynamic compression bracing is the standard non-surgical intervention.
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Etiology / Epidemiology
Common chest wall deformity in adolescent males; often associated with connective tissue disorders.
Clinical Manifestations
Protrusion of the sternum, known as pigeon chest; asymmetric or symmetric anterior chest wall prominence.
Diagnosis
Clinical diagnosis; CXR or CT chest used to assess severity and rule out cardiopulmonary compromise.
Treatment
Conservative management with orthotic bracing; surgical Nuss or Ravitch procedure for severe cases.
Prognosis
Generally asymptomatic; psychological impact is the most common clinical concern.
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Epidemiology & Etiology
Occurs predominantly in males with a 4:1 ratio. Frequently presents during the pubertal growth spurt. Strong association with Marfan syndrome and other connective tissue disorders.
Pertinent Anatomy
Characterized by the anterior protrusion of the sternum and costal cartilages. The deformity is classified as chondrogladiolar (most common) or chondromanubrial prominence.
Pathophysiology
Results from overgrowth of costal cartilages causing the sternum to push outward. Unlike pectus excavatum, the sternum is displaced anteriorly rather than posteriorly. Mechanical forces during rapid skeletal growth drive the progression.
Clinical Manifestations
Patients present with a visible anterior chest wall protrusion often described as pigeon chest. Most are asymptomatic, but some report chest pain or dyspnea during exertion. Psychological distress regarding body image is a common red flag for intervention.
Diagnosis
Diagnosis is primarily clinical via physical exam. CXR is the initial imaging to evaluate the thoracic cage. CT chest is the gold standard for quantifying the severity of the deformity and assessing for cardiopulmonary compression.
Treatment
Asymptomatic patients require observation. Orthotic bracing is the first-line non-surgical treatment for flexible deformities. Surgical correction via the Ravitch procedure is reserved for severe, symptomatic, or rigid cases. Contraindications for bracing include fixed, non-compliant chest walls.
Prognosis
Prognosis is excellent with minimal cardiopulmonary morbidity. Monitoring is required for progressive deformity during growth spurts. Psychological support is often necessary for adolescent patients.
Differential Diagnosis
Pectus excavatum: posterior sternal depression
Marfan syndrome: associated skeletal/cardiac findings
Poland syndrome: unilateral pectoralis muscle absence
Sternal tumor: localized mass or bony lesion
Rickets: rachitic rosary at costochondral junctions