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Chapter 102. Miscellaneous Benign Neoplasms

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Fig. 102-1 A

Miscellaneous benign neoplasms: Apocrine papillated cystadenoma is benign by virtue of its symmetry, sharp circumscription, and uniform hue, but diagnosis with specificity requires biopsy.


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Fig. 102-1 B

Miscellaneous benign neoplasms: Apocrine papillated cystadenoma is benign by virtue of its symmetry, sharp circumscription, and uniform hue, but diagnosis with specificity requires biopsy.


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Fig. 102-2 A

Miscellaneous benign neoplasms: Pilomatricoma. The redness is a reflection of a foreign body granulomatous reaction consequent to rupture of the benign cystic neoplasm.


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Fig. 102-2 B

Miscellaneous benign neoplasms: Pilomatricoma. The redness is a reflection of a foreign body granulomatous reaction consequent to rupture of the benign cystic neoplasm.


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Fig. 102-3

Miscellaneous benign neoplasms: A papule of pilomatricoma, a benign cystic neoplasm, is made up early of matrical cells mostly and years later of cornified “shadow cells” entirely, the latter being a flawed attempt at formation of cells of hair shaft from cells of the matrix.


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Fig. 102-4

Miscellaneous benign neoplasms: A papule of pilomatricoma, a benign cystic neoplasm, is symmetrical and sharply circumscribed, uniformly colored, and dome-shaped.


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Fig. 102-5

Miscellaneous benign neoplasms: This pilomatricoma resembles a cyst and, in fact, it is a benign cystic neoplasm.


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Fig. 102-6 A

Miscellaneous benign neoplasms: This poroma can be told to be benign because of its symmetry and rather sharp circumscription. As so often is the case for poroma, it resembles apyogenic granuloma clinically.


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Fig. 102-6 B

Miscellaneous benign neoplasms: This poroma can be told to be benign because of its symmetry and rather sharp circumscription. As so often is the case for poroma, it resembles apyogenic granuloma clinically.


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Fig. 102-7 A

Miscellaneous benign neoplasms: A spiradenoma cannot be diagnosed with specificity clinically, but can be told to be benign by virtue of its silhouette. The pigmented macule below it is a solar lentigo and the scaly pigmented macule to the right of it is a solar keratosis.


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Fig. 102-7 B

Miscellaneous benign neoplasms: A spiradenoma cannot be diagnosed with specificity clinically, but can be told to be benign by virtue of its silhouette. The pigmented macule below it is a solar lentigo and the scaly pigmented macule to the right of it is a solar keratosis.


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Fig. 102-8 A

Miscellaneous benign neoplasms: This spiradenoma could be misinterpreted clinically as a follicular cyst of the isthmic-catagen type. Palpation resolves that issue and biopsy enables diagnosis with specificity.


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Fig. 102-8 B

Miscellaneous benign neoplasms: This spiradenoma could be misinterpreted clinically as a follicular cyst of the isthmic-catagen type. Palpation resolves that issue and biopsy enables diagnosis with specificity.


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Fig. 102-9

Miscellaneous benign neoplasms: This large spiradenoma cannot be diagnosed with precision by examination grossly alone. Biopsy enables resolution of the matter.


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Fig. 102-10

Miscellaneous benign neoplasms: Syringocystadenoma papilliferum may develop independent of a nevus sebaceus, as is the case here.


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Fig. 102-11

Miscellaneous benign neoplasms: Trichoblastoma is the benign analogue of trichoblastic (basal-cell) carcinoma, it being a neoplasm of germinative cells like those in an embryo that give rise to the entire folliculosebaceous-apocrine unit.


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Fig. 102-12

Miscellaneous benign neoplasms: Familial trichoepitheliomas (trichoepitheliomatous trichoblastomas) are skin-colored, smooth-surfaced papules that tend to cluster.


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Fig. 102-13 A

Miscellaneous benign neoplasms: Familial trichoepitheliomas (trichoepitheliomatous trichoblastomas) present themselves as smooth-surfaced papules of different sizes and with a tendency to become confluent.


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Fig. 102-13 B

Miscellaneous benign neoplasms: Familial trichoepitheliomas (trichoepitheliomatous trichoblastomas) present themselves as smooth-surfaced papules of different sizes and with a tendency to become confluent.


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Fig. 102-14 A

Miscellaneous benign neoplasms: Beneath the right eye is a papule with a central dell typical of desmoplastic trichoepithelioma. The pigmented papules are Miescher’s nevi.


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Fig. 102-14 B

Miscellaneous benign neoplasms: Beneath the right eye is a papule with a central dell typical of desmoplastic trichoepithelioma. The pigmented papules are Miescher’s nevi.


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Fig. 102-15 A

Miscellaneous benign neoplasms: A shiny smooth-surfaced delled papule of trichofolliculoma. Long, light-colored, silken hairs often emerge from the dilated infundibular ostium in the center of the papule.


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Fig. 102-15 B

Miscellaneous benign neoplasms: A shiny smooth-surfaced delled papule of trichofolliculoma. Long, light-colored, silken hairs often emerge from the dilated infundibular ostium in the center of the papule.


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Fig. 102-16 A

Miscellaneous benign neoplasms: Apocrine mixed tumor often is thought clinically to be a cyst and, not uncommonly, a surgeon first cuts into it; when no contents emanate, it is excised.


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Fig. 102-16 B

Miscellaneous benign neoplasms: Apocrine mixed tumor often is thought clinically to be a cyst and, not uncommonly, a surgeon first cuts into it; when no contents emanate, it is excised.


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Fig. 102-17

Miscellaneous benign neoplasms: This microcystic adnexal carcinoma easily could be misinterpreted clinically as adesmoplastic trichoepithelioma, this particular carcinoma also being a papule punctuated by a dell.