Difference between revisions of "Ditzels"

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Line 186: Line 186:
=Cardiovascular pathology=
=Cardiovascular pathology=
{{Main|Cardiovascular pathology}}
{{Main|Cardiovascular pathology}}
==Vascular thrombosis==
==Vascular thrombus==
:''Venous thrombus'' and ''arterial thrombus'' redirect here.
===General===
===General===
*Uncommonly comes to pathology.
*Uncommonly comes to pathology.
Line 192: Line 193:
Risk factors - think [[Virchow's triad]]:
Risk factors - think [[Virchow's triad]]:
*Stasis, e.g. atrial fibrillation.
*Stasis, e.g. atrial fibrillation.
*Hypercoagulable states - see ''[[risks factors venous thromboembolism]]''.
*Hypercoagulable states, e.g. cancer - see ''[[risks factors venous thromboembolism]]''.
*Endothelial injury.
*Endothelial injury.


Revision as of 23:00, 8 November 2012

This article collects ditzels, which are, in the context of pathology, little specimens that are typically one or two slides and usually of little interest.[1]

The challenge in ditzels is not falling asleep... so one misses the unexpected (subtle) tumour.

A list of ditzels

Gastrointestinal

Neuropathology

  • Vertebral disc - see spine.

Pediatric

Orthopaedic

Head and neck pathology

  • Tonsil.

Cardiovascular pathology

Soft tissue

Gastrointestinal

Hernia sac

General

  • Hernia repair.
  • Pathologic findings are very unusual and if present known to the surgeon.
    • Thus, it has been advocated that one ought not examine 'em.[2][3]

Microscopic

Features:

  • Fibrous tissue.
  • +/-Adipose tissue.
  • +/-Mesothelial cells.

Notes:

  • One should not see vas deferens.
  • Things worthy of some comment: granulation tissue, inflammation.

Sign out

Incarcerated without mesothelium

SOFT TISSUE ("HERNIA SAC"), RESECTION: 
- FIBROADIPOSE TISSUE -- CONSISTENT WITH HERNIA SAC. 
- NEGATIVE FOR MALIGNANCY.
Micro

The sections show fibrofatty tissue with hemosiderin-laden macrophages, plump activated fibroblasts with pale staining nuclei, histiocytes with small nuclei and abundant grey vacuolated cytoplasm, fat necrosis and focal necrosis of the fibrous tissue.

Mesothelial lining present

SOFT TISSUE ("HERNIA SAC"), RESECTION: 
- FIBROADIPOSE TISSUE PARTIALLY COVERED BY MESOTHELIUM -- CONSISTENT WITH HERNIA SAC. 
- NEGATIVE FOR MALIGNANCY.

Stoma

See: Colon and Small intestine.

General

  • Reversal of ileostomy or colostomy.

Microscopic

Features:

  • Colonic-type or small intestinal-type bowel wall.
    • Lymphoid hyperplasia (abundant lymphocytes) - very common.
    • +/-Fibromuscular hyperplasia of the lamina propria and submucosa.
  • Skin.

Notes:

Pediatric

Bands of Ladd

General

  • Associated with intestinal malrotation.
  • Removed by Ladd's procedure.

Microscopic

Features:

  • Benign fibrous tissue.

Cholesteatoma

General

  • Squamous epithelium in the middle ear - leading to accumulation of keratinaceous debris.[4]
    • Keratosis obturans - accumulation in the external ear canal - is considered to be a different process;[5] though some consider it a synonym.[6]

Microscopic

Features:[7]

  • Keratinaceous debris - key feature.
  • Squamous epithelium.
  • Macrophages +/- giant cell (containing keratinceous debris).
  • Chronic inflammation (lymphocytes).

DDx:

  • Cholesterol granuloma.[8]

Genitourinary pathology

Foreskin

Main article: Penis

General

Indications:

Main considerations:

Microscopic

Features:

  • Usu. fibrotic dermis.
  • +/-Inflammation.

DDx:

Paraurethral cyst

General

  • Rare.
  • Benign.

Clinical:[9]

  • Presentation: mass lesion, dyspareunia or dysuria.
  • Multipareous.

Microscopic

Features:

  • Cystic space with epithelial lining - diagnosis based on epithelial lining.

Subclassification:[10][11]

Head and neck pathology

Tonsillitis

Tonsil redirects here.

General

  • Commonly removed (tonsillectomy) when enlarged.
  • Very low probability of malignancy (<0.2%) in tonsilectomies in individuals <19 years old if no clinical suspicion.[13]

Gross

  • Symmetrical and equal size.

Note:

  • Gross exam is considered sufficient if there is no asymmetry.[14]

Microscopic

Features:

DDx:

Sign out

A. TONSIL, LEFT, TONSILLECTOMY:
- REACTIVE FOLLICULAR HYPERPLASIA.
- REACTIVE SQUAMOUS MUCOSA.

B. TONSIL, RIGHT, TONSILLECTOMY:
- REACTIVE FOLLICULAR HYPERPLASIA.
- REACTIVE SQUAMOUS MUCOSA.

Without squamous mucosa

A. TONSIL, LEFT, TONSILLECTOMY:
- REACTIVE FOLLICULAR HYPERPLASIA.

B. TONSIL, RIGHT, TONSILLECTOMY:
- REACTIVE FOLLICULAR HYPERPLASIA.

Cardiovascular pathology

Main article: Cardiovascular pathology

Vascular thrombus

Venous thrombus and arterial thrombus redirect here.

General

  • Uncommonly comes to pathology.

Risk factors - think Virchow's triad:

Gross

See pulmonary embolism.

Features:

  • Dull appearance.
  • Laminations.

Microscopic

Features:

  • Layers consisting of platelets and fibrin.
    • Classically alternating with layers of RBCs - known as Lines of Zahn.[16]

Note:

  • Multiple laminations (layers), in general, suggest that clot was formed in a dynamic environment, i.e. in the context of blood flow.

DDx:

  • Tumour embolus.
  • Thromboembolus.
  • Fat embolism.
  • Amniotic fluid embolus.
  • Foreign body.

Images:

Sign out

BLOOD CLOT, LEFT ILIAC ARTERY, THROMBECTOMY:
- THROMBUS.
- NEGATIVE FOR MALIGNANCY.

Leg amputation

Overview

Comes in two basic flavours:

  • Above the knee ampuation (AKA).
  • Below the knee ampuation (BKA).

Etiology:

Atherosclerotic peripheral vascular disease

Main article: Atherosclerosis

General

Gross

  • +/-Ulceration.
  • +/-Gangrene - black skin - subclassified:
    • "Wet" = moist/oozing fluid.
    • "Dry" = shriveled, no moisture apparent.
  • +/-Loss of hair.

Image:

Sections - grossing:

  • Resection margin (check for viability).
  • Gangrenous area.
  • Blood vessels.
  • Bone (check for osteomyelitis).

Microscopic

Features:

Note:

  • Ischemia may be associated with marked nuclear changes. Uninitiated eyes may think they are seeing a sarcoma.

DDx:

Sign out

LEFT LEG, BELOW KNEE AMPUTATION:
- MODERATE-TO-SEVERE ATHEROSCLEROSIS.
- COAGULATIVE NECROSIS OF SOFT TISSUE.
- NECROTIC BONE.
- MARROW CAVITY FIBROSIS WITH SIDEROPHAGES.
- RESECTION MARGIN WITH VIABLE TISSUE.

Orthopaedic

Femoral head

Main article: Femoral head

Bone reamings

General

  • Taken during the surgical repair of a fracture, e.g. intramedullary nail placement.
  • Done to rule-out a pathologic fracture; considered reliable for detecting malignancy.[18]
    • Hassan et al.[19] advocate against their use, suggesting the yield is low and a biopsy should be preferred.

Microscopic

Features:[20]

  • Fragments of bone (scattered trabeculae).
    • Necrotic bone = bone with empty lacunae, i.e. lacunae missing osteocytes.
  • Bone marrow.
    • Megakaryocytes - large cells, multinucleated, eosinophilic cytoplasm.
    • Nucleated RBCs - perfectly round, dense nucleus, bright red cytoplasm.
    • Myeloid cells and precursors.
    • Adipocytes.

DDx:

Sign out

BONE, LEFT FEMUR, REAMINGS:
- FEATURES CONSISTENT WITH A RECENT FRACTURE.
- NEGATIVE FOR MALIGNANCY.

See also

References

  1. ↑ Weedman Molavi, Diana (2008). The Practice of Surgical Pathology: A Beginner's Guide to the Diagnostic Process (1st ed.). Springer. pp. 37. ISBN 978-0387744858.
  2. ↑ Siddiqui K, Nazir Z, Ali SS, Pervaiz S (February 2004). "Is routine histological evaluation of pediatric hernial sac necessary?". Pediatr. Surg. Int. 20 (2): 133–5. doi:10.1007/s00383-003-1106-2. PMID 14986035.
  3. ↑ Partrick DA, Bensard DD, Karrer FM, Ruyle SZ (July 1998). "Is routine pathological evaluation of pediatric hernia sacs justified?". J. Pediatr. Surg. 33 (7): 1090–2; discussion 1093–4. PMID 9694100.
  4. ↑ URL: http://www.harrisonspractice.com/practice/ub/view/Harrisons%20Practice/141015/all/otitis_media_and_mastoiditis. Accessed on: 16 March 2011.
  5. ↑ Piepergerdes MC, Kramer BM, Behnke EE (March 1980). "Keratosis obturans and external auditory canal cholesteatoma". Laryngoscope 90 (3): 383–91. PMID 7359960.
  6. ↑ Shire JR, Donegan JO (September 1986). "Cholesteatoma of the external auditory canal and keratosis obturans". Am J Otol 7 (5): 361–4. PMID 3538893.
  7. ↑ Iino Y, Toriyama M, Ohmi S, Kanegasaki S (1990). "Activation of peritoneal macrophages with human cholesteatoma debris and alpha-keratin". Acta Otolaryngol. 109 (5-6): 444–9. PMID 1694387.
  8. ↑ URL: http://path.upmc.edu/cases/case273/dx.html. Accessed on: 14 January 2012.
  9. ↑ Isen, K.; Utku, V.; Atilgan, I.; Kutun, Y. (Aug 2008). "Experience with the diagnosis and management of paraurethral cysts in adult women.". Can J Urol 15 (4): 4169-73. PMID 18706145.
  10. ↑ Satani, H.; Yoshimura, N.; Hayashi, N.; Arima, K.; Yanagawa, M.; Kawamura, J. (Mar 2000). "[A case of female paraurethral cyst diagnosed as epithelial inclusion cyst].". Hinyokika Kiyo 46 (3): 205-7. PMID 10806582.
  11. ↑ Das, SP. (Jul 1981). "Paraurethral cysts in women.". J Urol 126 (1): 41-3. PMID 7195943.
  12. ↑ URL: http://webpathology.com/image.asp?n=3&Case=540. Accessed on: 5 February 2012.
  13. ↑ PMID 15963574.
  14. ↑ PMID 14608541.
  15. ↑ Wang, XY.; Wu, N.; Zhu, Z.; Zhao, YF. (May 2010). "Computed tomography features of enlarged tonsils as a first symptom of non-Hodgkin's lymphoma.". Chin J Cancer 29 (5): 556-60. PMID 20426908.
  16. ↑ Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 124. ISBN 978-1416031215.
  17. ↑ 17.0 17.1 Dhawan, SS.; Wang, BW. (Feb 2007). "Four-extremity gangrene associated with crack cocaine abuse.". Ann Emerg Med 49 (2): 186-9. doi:10.1016/j.annemergmed.2006.08.001. PMID 17059855.
  18. ↑ Clarke, AM.; Rogers, S.; Douglas, DL. (Dec 1993). "Closed intramedullary biopsy for metastatic disease.". J R Coll Surg Edinb 38 (6): 368-9. PMID 7509409.
  19. ↑ Hassan, K.; Kalra, S.; Moran, C. (Aug 2007). "Intramedullary reamings for the histological diagnosis of suspected pathological fractures.". Surgeon 5 (4): 202-4. PMID 17849954.
  20. ↑ Tydings, JD.; Martino, LJ.; Kircher, M.; Alfred, RH.; Lozman, J. (Mar 1987). "Viability of intramedullary canal bone reamings for continued calcification.". Am J Surg 153 (3): 306-9. PMID 3548454.
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