Macroglossia (Enlarged Tongue): Etiologies from Acromegaly to Amyloidosis

Definition

Macroglossia = tongue enlargement beyond normal anatomic confines. True (histologic enlargement) vs. relative (normal tongue, small oral cavity).

Etiologic Classification

Category	Conditions	Mechanism
Infiltrative	Amyloidosis (AL), hypothyroidism/myxedema, sarcoidosis	Protein/glycosaminoglycan deposition
Neoplastic	Lymphoma, hemangioma, lymphangioma, squamous cell carcinoma	Mass effect
Developmental/Congenital	Beckwith-Wiedemann syndrome, Down syndrome, mucopolysaccharidoses	Genetic overgrowth signaling
Endocrine	Acromegaly (GH/IGF-1 excess), cretinism	Soft tissue/bone hypertrophy
Inflammatory/Infectious	Angioedema (C1 inhibitor deficiency, ACEi), Ludwig's angina	Edema, cellulitis
Iatrogenic	Post-radiation fibrosis, surgery	Scarring, contracture
Idiopathic	Isolated macroglossia	Unknown

Clinical Consequences

• Airway obstruction (especially supine)
• Dysphagia, dysarthria, drooling
• Malocclusion, open bite, prognathism
• Psychosocial impact

Workup

History, exam, imaging (MRI/CT), labs (TSH, SPEP/UPEP, genetic testing per syndrome), biopsy if infiltrative suspected.

Treatment

• Treat underlying cause (thyroxine, chemo, C1-INH concentrate).
• Surgical reduction (partial glossectomy) for functional impairment.
• Airway management (positioning, NIPAP, tracheostomy if critical).