Pityriasis lichenoides chronica presenting with bilateral palmoplantar involvement.

Pityriasis lichenoides is an uncommon, acquired, idiopathic, self-limiting skin disease that poses a challenge to patients and clinicians to diagnose and treat. Several variants exist including pityriasis lichenoides et varioliformis acuta (PLEVA), pityriasis lichenoides chronica (PLC), and febrile ulcer-onecrotic Mucha-Habermann disease. Precise classification can be difficult due to an overlap of clinical and histologic features.

Overview of skin diseases linked to connexin gene mutations.

Mutations in skin-expressed connexin genes, such as connexins 26, 30, 30.3, 31, and 43, have been linked to several human hereditary diseases with multiple organ involvement. Mutations in connexin 26 are linked to diseases including Vohwinkel syndrome, keratitis-ichthyosis deafness, and hystrix-like ichthyosis deafness syndromes, palmoplantar keratoderma with deafness, deafness with Clouston-like phenotype, and Bart-Pumphrey syndrome.

Merkel cell carcinoma: case report.

Merkel cell carcinoma (MCC), also termed cutaneous small cell carcinoma or trabecular carcinoma, is a rare tumor that most often presents as a solitary nodule on the head, neck, or extremities of older adults. It is an aggressive tumor that usually is fatal due to rapid metastasis. Involvement of lymph nodes at presentation can be used to predict survival.

[A modified method of preserving feces for the detection of intestinal protozoa].

Methylene blue is excluded from the original preservative in the modified conservation method elaborated by Safaraliev. The conserved material is examined in humid smear or, still better, after enrichment by falling out in the formol-ether solution or staining the smears by Lugol's solution or 0.25% solution of methylene blue.