Histologic Diagnosis of Inflammatory Skin Diseases

Errors and Reasons

…icroabscesses are requisite for diagnosis histopathologic of a patch or plaque of mycosis fungoides. Reason: As a rule, lymphocytes in patches and in subtly elevated plaques of mycosis fungoides are small and disposed entirely as solitary units in th…

Dermatology Practical & Conceptual

Notalgia paresthetica: the unreachable itch

…he patient’s left scapula is visible as a hyperpigmented patch. (B) The hyperpigmented patch is highlighted on the patient’s mid-back. [Copyright: ©2013 Ellis.] On examination, there was a hyperpigmented patch medial to the left scapula w…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Parapsoriasis?

…ons have the characteristic reddish-orange hue associated with patch and early plaque lesions of mycosis fungoides as they present themselves in Caucasians. Histopathologically, the lesions are characterized by patchy lichenoid infiltrates of lymphoc…

Histologic Diagnosis of Inflammatory Skin Diseases

Tinea nigra

…Comment A solitary, well-circumscribed, circinate, brown-black patch on a palm is the presentation most common of tinea nigra. Sometimes, there may be more than a single patch, and, at times, a sole patch may be the only involvement. Hyphae and spore…

Differential Diagnosis in Dermatopathology

Discussions

…bly indolent; in most patients, lesions do not progress beyond patches during the course of a lifetime. Only rarely do lesions evolve through patch, plaque, nodular, and tumor stages, and then usually at a petty pace. The vast majority of patients wi…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Radial Growth Phase versus Vertical Growth Phase of Melanoma?

“The essence of the radial growth phase is the incapacity to form tumor nodules in the dermis. Thus the radial growth phase may also be called nontumorigenic. . . . The vertical growth phase is, by definition, the appearance of a population o…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Primary and Secondary Lesions?

“Some of the appearances observed in cutaneous diseases are caused directly by the deposition of morbid products in the skin. These bear the name of Primary symptoms or eruptions, Efflorescentiae cutaneae primariae. But these eruptions often…