Synonyms

• Benign embryonal rhabdomyoma
• fetal rhabdomyoma

Category

Soft tissue

Behaviour

Benign

Gender

Both equally

Tissue of Origin

Skeletal muscle

Epidemiology

• Rare Benign muscle tumour
• Presents in children and young adults
• Cardiac form can present in infants

Clinical Features

• Slowly growing mass or incidental finding
• Cardiac form: arrhythmias or heart failure

Location

• Biliary tract
• Bladder
• Paratesticular
• Cardiac (embryonal subtype)

Imaging

Ultrasound or MRI: well-defined mass

Pathology

• Benign embryonal skeletal muscle differentiation
• No atypia, no mitotic activity

Genetics

Sporadic

Treatment

Observation or marginal excision

Prognosis

Excellent - Benign with no Malignant potential

Key Points

• Benign muscle tumour
• No transformation to rhabdomyosarcoma

Workup - Blood Tests

No blood tests required

Workup - Local Imaging

Ultrasound or MRI for characterisation

Workup - Biopsy

Rarely required

Workup - Staging

No staging required