Extraintestinal Manifestations of Celiac Disease

Introduction to Extraintestinal Manifestations

Celiac disease frequently presents with extraintestinal manifestations that may occur without any gastrointestinal symptoms, affecting multiple organ systems including bone, neurological, hematological, dermatological, hepatic, and reproductive systems 1, 2

Osteopenia and osteoporosis occur frequently in untreated celiac disease, with worldwide prevalence ranging from 1.7% to 42% depending on biological sex, geography, age at diagnosis, and clinical phenotype 3
Increased fracture risk shows a 60-100% excess compared to the general population before diagnosis, though this normalizes after the first year on a gluten-free diet despite persistent low bone mineral density 3

Cerebellar ataxia is a well-established neurological complication 1
Peripheral neuropathy occurs as both a complication and presenting manifestation 1
Epilepsy and seizures are documented in both children and adults 1
Depression and psychiatric disorders affect approximately 24% of adults with celiac disease 1

Iron deficiency anemia is the most common hematological manifestation, affecting 48% of adults at presentation and often resistant to oral iron supplementation 4
Anemia may occur even in the absence of gastrointestinal symptoms 2, 4

Infertility and recurrent miscarriages are associated with untreated celiac disease 1, 4
Adverse pregnancy outcomes occur in undiagnosed disease 1
Short stature is the most common extraintestinal manifestation in children (33%), though 28% of those unresponsive to gluten-free diet have other comorbidities 1

Type 1 diabetes has a prevalence of 5-10% in celiac patients 2
Autoimmune thyroid disease has a 3% prevalence of celiac disease in thyroid patients 2
Down syndrome has a confirmed celiac prevalence of 5.5% 2
Turner syndrome has a celiac prevalence of 6.3% 2

Many patients present exclusively with extraintestinal symptoms without gastrointestinal complaints, leading to significant diagnostic delay, according to the British Society of Gastroenterology 1, 2, 4
Only 24% of those with celiac disease are diagnosed, creating a "celiac iceberg" of undiagnosed cases 2, 4

Left undiagnosed and untreated, even asymptomatic celiac disease leads to higher risk of complications including osteoporosis, infertility, and small bowel lymphoma 2

Dermatitis herpetiformis (DH) is the pathognomonic cutaneous manifestation of celiac disease, characterized by intensely itchy, herpetiform clusters of urticated papules and small blisters on the extensor surfaces of elbows and knees, buttocks, and scalp, with males affected twice as often as females, and occurs most commonly between the third and fourth decades 5
The diagnostic criterion for DH is granular IgA deposits in dermal papillae of uninvolved perilesional skin on direct immunofluorescence, and diagnosis should not be made without this confirmation 5
Approximately 70% of DH patients have total or subtotal villous atrophy, while 25% have normal villous architecture with increased intraepithelial lymphocytes 5
Less than 10% of DH patients have malabsorption symptoms at presentation, though most have underlying celiac disease that responds to a gluten-free diet 5
More than 70% of patients on strict gluten-free diet can wean off dapsone over 24 months 5
DH shares with celiac disease an increased risk of developing lymphomas, particularly in those with severe gut involvement, though this risk declines with time on strict gluten-free diet 5

Treatment with gluten-free diet results in improvements in bone mineral density, with greatest improvements in the first years of treatment, according to the European Society of Gastrointestinal Endoscopy 6