The gross brain specimen shown above is from a patient diagnosed with a neurocutaneous syndrome. Which of the following cutaneous manifestations is most characteristic of this condition?
A. Café-au-lait macules
B. Neurofibromas
C. Ash-leaf macules
D. Cutaneous angiofibromas
Explanation
Image Findings
Gross specimen of a human brain, lateral view.
The cerebral hemispheres display a typical pattern of gyri and sulci.
The cerebellum is visible inferiorly and posteriorly.
Brainstem structures are partially observed at the base.
While specific pathognomonic lesions of Tuberous Sclerosis Complex (TSC) like prominent cortical tubers or subependymal giant cell astrocytomas are not clearly delineated in this black and white image, the image provides the context of a brain affected by a neurocutaneous syndrome.
Diagnosis
Key Point
The image depicts a brain, providing context for a neurocutaneous syndrome, and the most characteristic cutaneous finding for Tuberous Sclerosis Complex (TSC) is cutaneous angiofibromas.
Tuberous Sclerosis Complex (TSC) is an autosomal dominant neurocutaneous disorder characterized by the formation of benign tumors (hamartomas) in multiple organs, including the brain, skin, kidneys, heart, and lungs. While the specific brain lesions (e.g., cortical tubers, subependymal nodules, subependymal giant cell astrocytomas) are not overtly visible in this gross specimen, the question prompts us to identify a characteristic cutaneous manifestation of such a neurocutaneous syndrome. Among the given options, cutaneous angiofibromas are highly characteristic of TSC.
Differential Diagnosis
Table
Feature
Tuberous Sclerosis Complex (TSC)
Neurofibromatosis Type 1 (NF1)
Sturge-Weber Syndrome
Brain Findings
Cortical tubers, subependymal nodules, SEGA, white matter lesions
Early recognition of cutaneous stigmata like facial angiofibromas, ash-leaf macules, or shagreen patches can lead to timely diagnosis of TSC, allowing for surveillance and management of potentially life-threatening systemic manifestations, especially neurological and renal complications.
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Cutaneous angiofibromas (formerly known as adenoma sebaceum) are reddish-brown papules typically found on the malar regions of the face in a butterfly distribution, sparing the upper lip. They are a major diagnostic criterion for TSC.
Key Point
Other important cutaneous findings in TSC include ash-leaf macules (hypopigmented macules visible under Wood's lamp), shagreen patches (connective tissue nevi, typically on the lower back), and periungual fibromas (Koenen tumors).
Common Traps
Warning
Do not confuse cutaneous angiofibromas of TSC with neurofibromas of NF1 or port-wine stains of Sturge-Weber syndrome. While all are neurocutaneous syndromes, their specific cutaneous and systemic manifestations differ significantly. Ash-leaf macules are also characteristic of TSC, but angiofibromas are often considered the most visually striking and pathognomonic facial lesion.
Reference
Robbins Basic Pathology Ch 26, Harrison's Principles of Internal Medicine Ch 428
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