Cylindroma
Benign, slow-growing, rubbery skin bumps mostly found on the scalp and face, which can sometimes form massive clusters in inherited genetic conditions.
Emergency Management: Profuse bleeding from a traumatized, highly vascular large scalp lesion requiring hemostatic intervention.
A cylindroma is a benign adnexal tumor of the skin, most likely of apocrine or eccrine sweat gland origin. They present as slow-growing, smooth, firm, pink or red rubbery nodules predominantly found on the head and neck.
Detailed Overview
Cylindromas can occur sporadically as solitary lesions in adults or as multiple lesions in an inherited autosomal dominant pattern (Brooke-Spiegler syndrome, familial cylindromatosis). In severe inherited cases, multiple confluent tumors on the scalp can coalesce to cover the entire head like a turban, hence the term 'turban tumor'. While typically benign, malignant transformation is a rare but documented risk.
Epidemiology & Demographics
Solitary cylindromas are more common in adult females (female to male ratio of 6:1 to 9:1) and typically present in the 4th to 6th decades of life. Multiple cylindromas present earlier, usually around puberty, and affect both sexes.
Etiological Mechanism
Sporadic cases have unknown triggers. Multiple inherited cylindromas are caused by germline mutations in the CYLD gene on chromosome 16q12-q13.
Primary Causes
Loss of function mutations in the CYLD tumor suppressor gene, leading to unregulated cellular proliferation in skin appendages.
The CYLD gene encodes a deubiquitinating enzyme that acts as a negative regulator of the NF-kappaB and JNK signaling pathways. Loss of CYLD function (via a 'two-hit' hypothesis in familial cases) leads to constitutive activation of NF-kappaB, which promotes survival and proliferation of adnexal epithelial cells. Histologically, this results in well-circumscribed islands of basaloid cells arranged in a 'jigsaw puzzle' pattern, surrounded by a thick, eosinophilic hyaline basement membrane.
Diagnostic Criteria & Guidelines
Diagnosis is definitively made via excisional biopsy and histopathological examination revealing the characteristic 'jigsaw puzzle' morphology of basaloid cells surrounded by thick basement membrane material.
Surgical excision is the treatment of choice for solitary or small numbers of cylindromas. For multiple tumors (turban tumor stage), wide local excision with primary closure or split-thickness skin grafting is often required. The goal is complete removal with clear margins to prevent local recurrence.
Second-Line & Adjunctive Therapy
Destructive modalities like CO2 laser ablation, electrodessication, or cryotherapy can be used for multiple small lesions, but they carry a higher recurrence rate since the deep portion of the tumor may not be completely destroyed. In inherited cases where surgery is unfeasible for hundreds of lesions, topical salicylic acid has been anecdotally reported to reduce tumor volume, and investigations into topical targeted therapies (e.g., NF-kB inhibitors) are ongoing.
Surgical & Procedural Management
For massive 'turban tumors', a multidisciplinary approach involving plastic surgery is required for total scalp excision and reconstruction with skin grafts or tissue expanders.
Patient Counseling & Advice
For sporadic cases, reassure the patient that the lesion is benign and curative with excision. For Brooke-Spiegler syndrome, offer genetic counseling and explain the need for lifelong dermatologic surveillance due to the continuous development of new lesions.
Follow-Up & Monitoring Schedule
Annual full-body skin exams for patients with multiple cylindromatosis to detect new lesions or signs of malignant degeneration.
Preventive Strategies
No preventative measures exist. Prophylactic surgical removal of small lesions in Brooke-Spiegler syndrome can prevent massive disfigurement later in life.
Excellent for benign cylindromas following complete surgical excision. Recurrence is possible if margins are incomplete. Malignant cylindrocarcinoma carries a poor prognosis if metastasis has occurred.