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Follicular hybrid cysts. An expanded spectrum
1Departamento de Dermatología, Hospital Universitario San Carlos, Facultad de Medicina, Universidad Complutense, Madrid, Spain.
The American Journal of Dermatopathology
|June 1, 1991
Summary
Follicular hybrid cysts arise from various parts of the pilosebaceous unit, combining different cyst types. This review details these diverse combinations, expanding the definition beyond simple infundibular and trichilemmal cysts.
Area of Science:
- Dermatopathology
- Histology
- Oncology
Background:
- The hair follicle comprises distinct parts: infundibulum, isthmus, and inferior portion.
- Each part of the hair follicle can give rise to specific types of cutaneous cysts.
- Previous classifications recognized infundibular, trichilemmal, and matricial cysts as follicular in origin.
Purpose of the Study:
- To review and illustrate the various combinations of follicular hybrid cysts.
- To expand the understanding of hybrid cyst formation beyond established types.
- To emphasize that any combination of cysts from the pilosebaceous unit can form a hybrid cyst.
Main Methods:
- Literature review of reported follicular hybrid cysts.
- Histopathological analysis and illustration of different hybrid cyst combinations.
- Classification of hybrid cysts based on their follicular origins.
Main Results:
- Follicular cysts originate from the infundibulum, isthmus, and inferior portion of the hair follicle.
- Hybrid cysts result from the combination of different follicular cyst types.
- Reported combinations include infundibular-trichilemmal, infundibular-pilomatricoma, trichilemmal-pilomatricoma, eruptive vellus hair cyst-steatocystoma, and eruptive vellus hair cyst-trichilemmal cyst.
Conclusions:
- The concept of follicular hybrid cysts encompasses a broader range of combinations than previously recognized.
- Any cyst type originating from the pilosebaceous unit can combine to form a hybrid cyst.
- This broadens the spectrum of follicular hybrid cysts, including combinations with pilomatricomas and steatocystomas.