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This activity delves into the evaluation of cysts, a common yet intricate facet of pathology, particularly in the skin. Pathologists frequently encounter cysts in routine practice, and their diverse origins necessitate a nuanced understanding for accurate diagnosis. Whether arising from native epithelium, embryologic remnants, or ectopic glandular tissue, cysts exhibit clinicopathologic features that allow for distinct classification. While predominantly benign, the rare occurrence of malignant changes in cutaneous cysts underscores the importance of a thorough evaluation. This educational session reviews the clinical and microscopic attributes of both common and rare cutaneous cysts, offering clinicians valuable insights into their syndromic associations. Moreover, the activity elucidates a structured approach to histopathologic diagnosis, emphasizing key considerations such as epithelial lining, cyst contents, ancillary histopathologic features, and the clinical setting, enabling pathologists to diagnose these frequently encountered entities adeptly. Dermatopathologists are frequently tasked with assessing enclosed tissue sacs containing fluid or semisolid matter, commonly called cysts. This activity systematically categorizes cutaneous cysts into 3 groups: appendageal cysts, developmental cysts, and miscellaneous cysts, each with distinct origins and diagnostic challenges. The focus extends beyond conventional categorization, providing a practical approach to evaluating true cysts involving the skin. The activity discusses the microscopic examination, emphasizing the significance of recognizing features such as epithelial lining, cyst contents, and ancillary histopathologic features. By providing a comprehensive understanding of cutaneous cysts and their diverse manifestations, this article equips clinical professionals with the essential tools to navigate the complexities of diagnosis, ensuring accurate identification and, where relevant, recognition of cysts as potential cutaneous markers for underlying genetic or inflammatory diseases. Objectives: Identify the clinical and microscopic features of common and rare true cysts involving the skin. Evaluate the lining and contents of cutaneous cysts to generate an accurate diagnosis. Identify cysts that, in an appropriate clinical context, may serve as cutaneous markers of an underlying genetic or inflammatory disease.

Objectives: Identify the clinical and microscopic features of common and rare true cysts involving the skin. Evaluate the lining and contents of cutaneous cysts to generate an accurate diagnosis. Identify cysts that, in an appropriate clinical context, may serve as cutaneous markers of an underlying genetic or inflammatory disease. Develop communication of unusual microscopic findings and the potential syndromic associations of specific cutaneous cysts with the interprofessional team (eg, dermatologists, nurse practitioners, surgeons, family physicians, and other pathologists) to ensure ideal patient management and initiate any relevant additional investigation. Access free multiple choice questions on this topic.

Dermatopathologists are frequently required to evaluate cysts, which are enclosed tissue sacs containing fluid or semisolid matter. An epithelium lines true cysts, and that epithelium may be native, originate from embryologic remnant tissue, or come from another part of the body entirely. Pseudocysts are the name for cystic structures that lack such an epithelium.[1] While numerous subtypes exist, cutaneous cysts can be simplified into 3 groups: Appendageal cysts or folliculosebaceous unit cysts, which are derived from dermal appendages (eg, hair follicles) as retention cysts Developmental cysts, which are derived from vestigial structures (eg, embryonic remnants) Miscellaneous cysts (some of which may be classified as pseudocysts) may be due to ectopic glandular tissue, lymphatic origin, infection, or deposition. Cysts can also be histopathologically grouped with sinuses and pits, but these are not elucidated here. Occasionally, hybrid cysts with features suggestive of multiple lineages are encountered, such as an epidermal inclusion cyst that transitions to a trichilemmal cyst. Malignant transformation rarely occurs in otherwise typical cysts. A structured approach to the histopathologic diagnosis of cutaneous cysts involves the assessment of the following features: Epithelial lining Cyst contents Ancillary histopathologic features Clinical setting or clinical picture Additional nuances include recognizing microscopic features or clinical settings where cysts may serve as cutaneous markers for an underlying genodermatosis or inflammatory disease. A practical approach to diagnosing true cysts involving the skin is provided.