Richard Evans Zitwer, MD

Retired surgical and clinical pathologist (MD). Now enjoying traveling and being with my grandchildren. T/RT are not medical advice and do not imply endorsement

[Richard Evans Zitwer, MD @RZitwer]

@JMGardnerMD Great images.

[Richard Evans Zitwer, MD @RZitwer]

@JMGardnerMD Juvenile psammomatoid ossifying fibroma (JPOF), ethmoid bone.

[Richard Evans Zitwer, MD @RZitwer]

@pathphyo invasive breast carcinoma and lactating adenoma.

[Richard Evans Zitwer, MD @RZitwer]

@Saroja_DeviG @ZuckerPathRes Mesenteric nodule, SIGNET RING CELLS.

Permanent sections + IHC confirmed adenocarcinoma with signet ring cell features, consistent with an upper GI tract origin.

[Richard Evans Zitwer, MD @RZitwer]

@sza_jhcyto @kriyer68 Metastatic "Small Cell Carcinoma" aspirated from the thyroid. Patient had a known history of a "mixed small cell-adenocarcinoma" of the lung. Nice.

[Richard Evans Zitwer, MD @RZitwer]

@israhkhan @kis_lorand @DZenezan @IACytology @MdTushir @belogrivceva_e @mdlozanoe @pepeheffernan @FirdeMD @DioufaNikolina @Duy45141650 @Arshi_Asma Pleural effusion ,75 year old female ,first time diagnosis by fluid cytology
Thin prep slide, cell block(low/high), TTF-1+.
Metastatic lung adenocarcinoma.

[Richard Evans Zitwer, MD @RZitwer]

@duckhuca @SansanoValero Typical Carcinoid Tumor.
⬇️ Sub- bronchial lesion.
🈯 Trabecular pattern.
🧂 Salt and pepper chromatin.

[Richard Evans Zitwer, MD @RZitwer]

@B_C_Dickson @SumantaDas_7 SCLEROSING EPITHELIOID FIBROSARCOMA. IHC: MUC4. NGS: FUS-CREB3L2. NB: this case has so-called 'hybrid' features with low-grade fibromyxoid sarcoma; loose fascicles of spindle-epithelioid cells; bland ovoid nuclei; stroma that ranges from firomyxoid to sclerotic.

[Richard Evans Zitwer, MD @RZitwer]

@kaseyjeanene @M_Jikurashvili SMA diffuse + Glomus Tumor. Finger.

[Richard Evans Zitwer, MD @RZitwer]

@mdlozanoe @EfcsYoung @IACytology @israhkhan @Gloria_SuraMD @tlabiano @IvanaKholova @MozeticV @smlungpathguy @drruizcor @pathologyfinder @sza_jhcyto @DrRanasaleh Small cell lung Ca. Great description.

[Richard Evans Zitwer, MD @RZitwer]

@JMGardnerMD Granular cell tumor (with pseudoepitheliomatous hyperplasia mimicking squamous cell carcinoma).

[Richard Evans Zitwer, MD @RZitwer]

@pathphyo Antler horn pattern of ductal epithelial cells in fibroadenoma of breast.

[Richard Evans Zitwer, MD @RZitwer]

@JMGardnerMD Plexiform Neurofibroma (NF1 neurofibromatosis). Great video and discussion.

[Richard Evans Zitwer, MD @RZitwer]

@JMGardnerMD Blastomycosis.

[Richard Evans Zitwer, MD @RZitwer]

@sza_jhcyto single cell pattern is classic for "Gastric" or "Breast Lobular" CA.

[Richard Evans Zitwer, MD @RZitwer]

@mdlozanoe @sza_jhcyto Single cell pattern in fluids (pleural) is unusual for lung adenocarcinoma, as in this case. TTF1 +

[Richard Evans Zitwer, MD @RZitwer]

@Gloria_SuraMD Cerebrospinal fluid revealing metastatic breast cancer.

[Richard Evans Zitwer, MD @RZitwer]

@megha_lalcheta Metastasis of Hepatocellular carcinoma to brain,
PanCK +, AFP weak +, TTF1 -, PAX8-, Glypican3 -, p63 -, WT1 -, Bhcg -.

[Richard Evans Zitwer, MD @RZitwer]

@megha_lalcheta Metastatic adenocarcinoma in left parenchyma of brain.

[Richard Evans Zitwer, MD @RZitwer]

@JMGardnerMD Invasive Melanoma with tons of pagetoid spread.