Glomus tumor

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Glomus tumor
File:Glomus tumour - high mag.jpg
Synonyms	Glomangioma
Pronounce	N/A
Specialty	N/A
Symptoms	Pain, tenderness, sensitivity to temperature changes
Complications	Rarely malignant transformation
Onset	Typically in adulthood
Duration	Chronic
Types	N/A
Causes	Unknown, possibly genetic
Risks	Family history, genetic mutations
Diagnosis	Physical examination, Imaging studies, Biopsy
Differential diagnosis	Hemangioma, Neuroma, Epidermal inclusion cyst
Prevention	None
Treatment	Surgical excision
Medication	Pain management
Prognosis	Excellent with treatment
Frequency	Rare
Deaths	N/A

File:2011 May Glomus Tumor Extraction Closeup.jpg

Closeup of glomus tumor extraction

Glomus tumor is a rare, usually benign vascular tumor that arises from the glomus body, a specialized structure involved in thermoregulation. These tumors are most commonly found in the skin, particularly under the fingernail (subungual region), but may occur anywhere in the body.

Overview

Glomus tumors originate from modified smooth muscle cells of the glomus body, which plays a role in regulating blood flow for temperature control. These tumors are typically small but can cause disproportionate and severe pain.

They are characterized by:

• Intense localized pain
• Extreme sensitivity to cold
• Tenderness to touch

Anatomy and function of the glomus body

The glomus body is a specialized arteriovenous shunt found primarily in:

• Fingertips
• Toes
• Nail beds

It helps regulate skin temperature by controlling blood flow between arterioles and venules.

Epidemiology

Glomus tumors are uncommon and account for a small percentage of soft tissue tumors. They:

• Occur more frequently in adults
• Are slightly more common in women (especially subungual tumors)
• May present as solitary or multiple lesions

Etiology

The exact cause of glomus tumors is not fully understood. They arise from:

• Proliferation of glomus body cells
• Possible genetic factors in familial cases

Some multiple glomus tumors (glomangiomas) are associated with inherited mutations.

Classification

Glomus tumors are classified into:

Solitary glomus tumor

• Most common form
• Usually painful
• Typically found under the nail

Glomangioma

• Multiple lesions
• Less painful
• May be hereditary

Glomangiomyoma

• Rare variant
• Shows features of smooth muscle differentiation

Signs and symptoms

Common symptoms include:

• Severe, localized pain
• Pinpoint tenderness
• Cold hypersensitivity
• Bluish or reddish discoloration
• Nail deformity (in subungual tumors)

Clinical features

Patients often report:

• Pain triggered by minor pressure
• Pain worsened by cold exposure
• Relief after removal of the lesion

Classic diagnostic triad:

1. Pain
2. Tenderness
3. Cold sensitivity

Diagnosis

Diagnosis is based on clinical evaluation and imaging.

Clinical examination

Tests may include:

• Love’s pin test (localized pain)
• Cold sensitivity test
• Hildreth’s test (pain relief with tourniquet)

Imaging

• Magnetic resonance imaging (MRI) – most sensitive
• Ultrasound – may detect small lesions
• X-ray – may show bone erosion in advanced cases

Histopathology

Microscopic examination shows:

• Uniform glomus cells
• Vascular channels
• Smooth muscle components

Differential diagnosis

Conditions to consider include:

• Hemangioma
• Neuroma
• Melanoma
• Subungual hematoma
• Epidermoid cyst
• Fibroma

Treatment

The primary treatment is:

Surgical excision

• Complete removal of the tumor
• Usually curative
• Provides immediate pain relief

Other treatments

• Laser therapy (in select cases)
• Sclerotherapy (rarely used)

Prognosis

The prognosis is excellent after complete excision.

• Recurrence is uncommon but may occur if excision is incomplete
• Malignant transformation is extremely rare

Complications

Possible complications include:

• Recurrence
• Nail deformity
• Persistent pain (if incompletely removed)

Malignant glomus tumor

Rarely, glomus tumors may become malignant (glomangiosarcoma), characterized by:

• Larger size
• Rapid growth
• Deep location
• Increased mitotic activity

These require more aggressive treatment and follow-up.

See also

• Vascular tumor
• Hemangioma
• Soft tissue tumor
• Dermatology
• Pathology

External links

• Glomus tumor – medical references