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← Older revision		Revision as of 06:20, 8 April 2025
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	[[~~file~~:Pigmented_spindle_cell_nevus_-_low_mag.jpg\|thumb\|~~left~~]] '''Pigmented spindle cell nevus''' (PSCN), also known as '''Reed nevus''', is a type of [[melanocytic nevus]] characterized by its distinctive histological appearance. It is a benign skin lesion that typically presents as a small, darkly pigmented macule or papule.		{{SI}}
			{{Infobox medical condition
			\| name = Pigmented spindle cell nevus
			\| image = [[File:Pigmented_spindle_cell_nevus_-_low_mag.jpg\|left\|thumb\|Pigmented spindle cell nevus under low magnification]]
			\| caption = Histological image of a pigmented spindle cell nevus
			\| synonyms = Reed nevus
			\| field = [[Dermatology]]
			\| symptoms = Darkly pigmented skin lesion
			\| complications = Rarely, [[malignant transformation]]
			\| onset = Typically in [[adolescence]] or [[young adulthood]]
			\| duration = [[Chronic (medicine)\|Chronic]]
			\| causes = Unknown
			\| risks = [[Sun exposure]], [[genetic predisposition]]
			\| diagnosis = [[Skin biopsy]], [[dermoscopy]]
			\| differential = [[Melanoma]], [[dysplastic nevus]]
			\| prevention = [[Sun protection]]
			\| treatment = [[Surgical excision]] if necessary
			\| prognosis = Excellent, benign condition
			\| frequency = Rare
			}}
			'''Pigmented spindle cell nevus''' (PSCN), also known as '''Reed nevus''', is a type of [[melanocytic nevus]] characterized by its distinctive histological appearance. It is a benign skin lesion that typically presents as a small, darkly pigmented macule or papule.
	== Clinical Presentation ==		== Clinical Presentation ==
	Pigmented spindle cell nevus usually appears as a solitary, well-circumscribed, dark brown to black lesion. It is most commonly found on the lower extremities, particularly the thighs, but can occur on any part of the body. The lesion is typically less than 1 cm in diameter and may be slightly raised.		Pigmented spindle cell nevus usually appears as a solitary, well-circumscribed, dark brown to black lesion. It is most commonly found on the lower extremities, particularly the thighs, but can occur on any part of the body. The lesion is typically less than 1 cm in diameter and may be slightly raised.

	== Histopathology ==		== Histopathology ==
	Under the microscope, pigmented spindle cell nevus is characterized by the presence of spindle-shaped [[melanocytes]] arranged in fascicles or bundles. These melanocytes are heavily pigmented, giving the lesion its dark color. The nevus cells are usually confined to the [[epidermis]] and the superficial [[dermis]], and there is often a lack of significant cellular atypia or mitotic activity, distinguishing it from [[malignant melanoma]].		Under the microscope, pigmented spindle cell nevus is characterized by the presence of spindle-shaped [[melanocytes]] arranged in fascicles or bundles. These melanocytes are heavily pigmented, giving the lesion its dark color. The nevus cells are usually confined to the [[epidermis]] and the superficial [[dermis]], and there is often a lack of significant cellular atypia or mitotic activity, distinguishing it from [[malignant melanoma]].

	== Differential Diagnosis ==		== Differential Diagnosis ==
	The primary differential diagnosis for pigmented spindle cell nevus includes:		The primary differential diagnosis for pigmented spindle cell nevus includes:
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	* [[Common acquired melanocytic nevus]]		* [[Common acquired melanocytic nevus]]
	* [[Blue nevus]]		* [[Blue nevus]]

	== Management ==		== Management ==
	The management of pigmented spindle cell nevus typically involves clinical observation and regular follow-up. If there is any doubt about the diagnosis, or if the lesion shows signs of change, an excisional biopsy may be performed to rule out malignancy. Complete excision with clear margins is usually curative.		The management of pigmented spindle cell nevus typically involves clinical observation and regular follow-up. If there is any doubt about the diagnosis, or if the lesion shows signs of change, an excisional biopsy may be performed to rule out malignancy. Complete excision with clear margins is usually curative.

	== Prognosis ==		== Prognosis ==
	The prognosis for pigmented spindle cell nevus is excellent, as it is a benign lesion with no potential for metastasis. However, due to its clinical and histological similarities to malignant melanoma, careful evaluation and monitoring are essential.		The prognosis for pigmented spindle cell nevus is excellent, as it is a benign lesion with no potential for metastasis. However, due to its clinical and histological similarities to malignant melanoma, careful evaluation and monitoring are essential.

	== See Also ==		== See Also ==
	* [[Melanocytic nevus]]		* [[Melanocytic nevus]]
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	* [[Malignant melanoma]]		* [[Malignant melanoma]]
	* [[Dermatology]]		* [[Dermatology]]

	== References ==		== References ==
	{{Reflist}}		{{Reflist}}

	[[Category:Dermatology]]		[[Category:Dermatology]]
	[[Category:Melanocytic nevi and neoplasms]]		[[Category:Melanocytic nevi and neoplasms]]
	[[Category:Skin conditions resulting from errors in metabolism]]		[[Category:Skin conditions resulting from errors in metabolism]]

	{{medicine-stub}}		{{medicine-stub}}

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[[file:Pigmented_spindle_cell_nevus_-_low_mag.jpg|thumb|left]] '''Pigmented spindle cell nevus''' (PSCN), also known as '''Reed nevus''', is a type of [[melanocytic nevus]] characterized by its distinctive histological appearance. It is a benign skin lesion that typically presents as a small, darkly pigmented macule or papule.

== Clinical Presentation ==
Pigmented spindle cell nevus usually appears as a solitary, well-circumscribed, dark brown to black lesion. It is most commonly found on the lower extremities, particularly the thighs, but can occur on any part of the body. The lesion is typically less than 1 cm in diameter and may be slightly raised.

== Histopathology ==
Under the microscope, pigmented spindle cell nevus is characterized by the presence of spindle-shaped [[melanocytes]] arranged in fascicles or bundles. These melanocytes are heavily pigmented, giving the lesion its dark color. The nevus cells are usually confined to the [[epidermis]] and the superficial [[dermis]], and there is often a lack of significant cellular atypia or mitotic activity, distinguishing it from [[malignant melanoma]].

== Differential Diagnosis ==
The primary differential diagnosis for pigmented spindle cell nevus includes:
* [[Malignant melanoma]]
* [[Spitz nevus]]
* [[Common acquired melanocytic nevus]]
* [[Blue nevus]]

== Management ==
The management of pigmented spindle cell nevus typically involves clinical observation and regular follow-up. If there is any doubt about the diagnosis, or if the lesion shows signs of change, an excisional biopsy may be performed to rule out malignancy. Complete excision with clear margins is usually curative.

== Prognosis ==
The prognosis for pigmented spindle cell nevus is excellent, as it is a benign lesion with no potential for metastasis. However, due to its clinical and histological similarities to malignant melanoma, careful evaluation and monitoring are essential.

== See Also ==
* [[Melanocytic nevus]]
* [[Spitz nevus]]
* [[Malignant melanoma]]
* [[Dermatology]]

== References ==
{{Reflist}}

[[Category:Dermatology]]
[[Category:Melanocytic nevi and neoplasms]]
[[Category:Skin conditions resulting from errors in metabolism]]

{{medicine-stub}}

Pigmented spindle cell nevus - Revision history

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