Utility of p63 in the differential diagnosis of atypical fibroxanthoma and spindle cell squamous cell carcinoma

Atypical fibroxanthoma (AFX), spindle cell squamous cell carcinoma (SCSCC) and spindle cell melanoma are the primary entities in the differential diagnosis of a cytologically atypical spindle cell tumor arising on sun-damaged skin. AFX is generally regarded as a diagnosis of exclusion in this context: in the absence of S100 or keratin reactivity, a diagnosis of AFX is favored. However, keratin reactivity may be focal or even absent in SCSCC, and although numerous positive markers of AFX have been proposed, none has shown sufficient sensitivity and specificity for routine diagnostic use. We evaluated 20 AFX and 10 SCSCC with a panel of cytokeratins and p63 to assess the utility of the latter antibody in this differential diagnosis. All 10 SCSCC showed strong expression of p63, whereas all 20 AFX were p63 negative. Two additional cases (excluded from the study) were negative for keratins and S100 on initial shave biopsies, resulting in a favored diagnosis of AFX, but p63 stains performed retrospectively were positive. However, review of the excision specimens in both cases revealed deep subcutaneous extension, excluding AFX. p63 reactivity argues against the diagnosis of AFX and is therefore a useful addition to the standard immunohistochemical panel for cutaneous spindle cell neoplasms.

Autonomic dysreflexia and associated acute neurogenic pulmonary edema in a patient with spinal cord injury: a case report and review of the literature

STUDY DESIGN

A case report of a patient with spinal cord injury with autonomic dysreflexia and associated acute neurogenic pulmonary edema.

OBJECTIVE

To further describe autonomic dysreflexia as a potential cause of acute neurogenic pulmonary edema; specifically in a population with spinal cord injury.

SETTING

James A Haley Veterans Hospital, Tampa, FL, USA.

METHODS

A patient with a prior history of C5 AIS (ASIA impairment scale) B spinal cord injury was admitted for bowel preparation before a screening colonoscopy. During the 2-day bowel preparation, the patient developed severe autonomic dysreflexia. Due to persistent hypertension and acute onset respiratory failure, he required transfer to the intensive care setting.

RESULTS

Following a complicated course, the patient expired without a definitive cause of death. Autopsy findings showed gross and microscopic evidence of pulmonary edema.

CONCLUSIONS

To date, the association between autonomic dysreflexia and acute neurogenic pulmonary edema is not described in the spinal cord or rehabilitation literature. The purpose of this case report is to further describe the overlooked and/or under reported incidence of acute neurogenic pulmonary edema associated with episodes of dysreflexia in a population with spinal cord injury.

Malignant perivascular epithelioid cell tumor ('PEComa'): a case report and literature review of cutaneous/subcutaneous presentations

Perivascular epithelioid cell (PEC) tumors, also called 'PEComas,' are distinct tumors showing PEC differentiation with characteristic histologic and immunophenotypic features. PEComas are rare tumors documented in the literature presenting in numerous anatomic sites including the thorax, abdomen, pelvis, soft tissue and skin. Criteria for malignancy does not exist for the subset of PEComas that pursue an aggressive clinical course. Herein, we present an unusual case of a malignant PEC tumor presenting as a scalp nodule in a patient with a prior diagnosis of 'melanoma' based upon the immunophenotypic profile of an excised enlarged cervical lymph node. The purpose of this case presentation is to further describe the rare clinical manifestations of a subcutaneous PEC tumor, emphasize the malignant potential of this entity, and review the literature focusing upon clinicopathologic features of cutaneous/subcutaneous PEComas.

Purple penile papules

Molluscum contagiosum may present in a variety of clinical and pathologic guises. We present the clinicopathologic features of an unusual case that initially was misinterpreted as bowenoid papulosis. The relevant histologic attributes of this case include the presence of a violaceous hyperplastic squamous epithelium adjacent to the infected keratinocytes. The presence of this violaceous cytoplasmic staining should prompt a search for molluscum in the appropriate clinical context.