Regressing atypical histiocytosis:A cutaneous proliferation of atypical neoplastic histiocytes with unexpectedly indolent biologic behavior

Cutaneous schwannoma: an atypical presentation*

An Bras Dermatol. 2017;92(3):433-43. Dear Editor, We report the case of a 66-year-old male patient who presented with a 10-year history of a nodular mass in the right leg region. The patient referred a gradual enlargement of the lesion, which had a quick growth in the last two years. He had arterial hypertension and hypothyroidism but no history of neurological pathologies. Dermatological exami...

Cutaneous location of atypical teratoid/rhabdoid tumour.

Atypical teratoid/rhabdoid tumour is a rare and highly malignant tumour of the posterior fossae nervous system that occurs in children especially in the first few years of life. Cutaneous location is not previously reported. A newborn boy was referred for both aqueductal stenosis detected antenatally and skin tags mimicking hamartoma. The cerebral tumour increased in size during a few months le...

CD30-positive atypical lymphoid cells in common non-neoplastic cutaneous infiltrates rich in neutrophils and eosinophils.

CD30-positive cells characterize lymphomatoid papulosis and anaplastic large cell lymphoma but can also be found in nonneoplastic skin disorders. Purportedly, CD30 is useful in the differential diagnosis between insect bites and lymphomatoid papulosis. Recently, a subtype of neutrophil-rich CD30-positive anaplastic large cell lymphoma has been described, which may enter the differential diagnos...

[Atypical pachydermatous cutaneous course of mastocytosis].

We describe the case of a 75-year-old man first seen in our department 32 years ago for generalized yellowish erythematous papular lesions along with an attack of pruritus, tachycardia, and flushing. A diagnosis of urticaria pigmentosa was proposed on the basis of these symptoms and the results of skin biopsy. Periodic follow-up in the intervening years included serial laboratory analyses, skin...

Atypical cutaneous actinobacillosis in young beef cattle.